CN103984032A - Multiple-work-mode nuclear magnetism signal detection device and method for real-time signal-noise characteristic extraction - Google Patents
Multiple-work-mode nuclear magnetism signal detection device and method for real-time signal-noise characteristic extraction Download PDFInfo
- Publication number
- CN103984032A CN103984032A CN201410175126.2A CN201410175126A CN103984032A CN 103984032 A CN103984032 A CN 103984032A CN 201410175126 A CN201410175126 A CN 201410175126A CN 103984032 A CN103984032 A CN 103984032A
- Authority
- CN
- China
- Prior art keywords
- signal
- master control
- nuclear magnetic
- noise
- coil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Abstract
The invention provides a multiple-work-mode nuclear magnetism signal detection device and method for real-time signal-noise characteristic extraction. The method includes the steps that data share between a main control PC and other detection computers which are located in the same local area network is achieved through a wireless router; the wireless router generates the wireless local area network, and the main control PC is made to be located in the local area network; the detection computers share data stored on the main control PC through the local area network; signal-noise characteristic analysis is conducted on a nuclear magnetism signal through MRS signal analysis software; characteristic parameters are extracted; the characteristic parameters, such as the signal to noise ratio, are fed back to the main control PC through the wireless local area network; whether the work mode of an instrument system is changed or not is judged according to the characteristic parameters. According to the method, signal-noise characteristic analysis can be conducted out of the range of a detection site almost at the same time when data are collected on site, the main control PC judges how serious signals collected outdoor are interfered with by environmental noise according to the feedback conditions, and therefore measurement precision and accuracy are improved.
Description
Technical field
The present invention relates to a kind of multi-operation mode nuclear magnetic signal sniffer and method of extracting based on real-time signal-to-noise characteristic, the collection of signal under the nuclear magnetic signal acquisition module assigned work pattern of utilization based on FPGA, and by wireless router by the shared data of the master control PC of storage data and detection computations machine that other are in same LAN (Local Area Network), carry out real-time signal-to-noise characteristic extraction, and feed back to master control PC and select suitable mode of operation, realize the apparatus and method that under multi-operation mode, NMR signal is surveyed.
Background technology
Transition along with global climate, drought situation is all over the world also in continuous aggravation, although there are abundant groundwater resource in China, but 1/4 of the per capita water yield in the per capita water yield Jin Wei world, become in the world one of country of shortage of water resources per capita, thereby survey in time and effectively utilize groundwater resource extremely urgent.Based on nuclear magnetic resonance principle, the sniffer of water content is arisen at the historic moment in through years of researches practice, this device can carry out directly water content, effective, harmless, detection accurately, now in the whole nation, many ground has successfully found groundwater resource, for local production and the people's life provides great convenience.
Although nuclear magnetic resonance water witch can directly be surveyed water content, but be all generally the working method of rule of thumb determining instrument (same coil detection mode, separate winding detection mode, with reference to offseting detection mode) and selection corresponding parameter (stacking fold, threshold parameter etc.) collection in worksite and store nuclear magnetic signal, the analyzing and processing later stage of data is undertaken by special staff.In data acquisition, cannot provide so the real-time signal-to-noise characteristic of data, cause sometimes instrument working method or relevant parameter to arrange incorrect and cause that instrument does not rationally gather valid data, even in same work-yard, take multiple measurements in different ways, reduce undoubtedly work efficiency, incured loss through delay manufacturing schedule.
CN2518116Y has announced a kind of nuclear magnetic resonance ground water layer detecting instrument, comprise signal detector, it is characterized in that, one input end of this signal detector connects one first switch, the another end of this first switch is connected in series a speed change resistor, second and the 3rd liang of switch of another end serial connection of this speed change resistor, the another end of second switch is connected in series a current-limiting resistance, and be sequentially serially connected with rectifier and generator, the another end of this generator is connected with the other end of signal detector, wherein between this second and the 3rd liang of switch, be connected to one first capacitor, the another end of this first capacitor is connected with the other end of signal detector, between this first switch and speed change resistor, be connected to a coil, the another end of this coil is connected with the other end of signal detector, between the two ends of this signal detector, there is a capacitor.This invention adopts by cable and surrounds into circular or square single-turn circular coil as excitation and receiving coil, has designed the nuclear magnetic resonance detection instrument that is applicable to water detection.
CN102096111 disclosed " the separated formula nuclear magnetic resonance water detection device of dual-mode antenna and groundwater prospecting method ", be that computing machine is connected with high-power source, transmitting and control module, current acquisition unit, frequency-selecting amplifying unit, signal gathering unit by serial ports, transmitting and control module connect and compose by controlling bus through H bridge road and joining humorous electric capacity, transmitting coil and diode.The method has realized emitting antenna separated with receiving antenna, makes emission coefficient and the receiving system can be separate, has simplified Connection Step and the mode of operation of total system, has improved the dirigibility that body of groundwater is surveyed.
CN102053280 discloses " a kind of nuclear magnetic resonance underground water detection system and detection method with reference coil ", by the Full wave shape data of noise signal in the NMR signal in multi-channel A/D collecting unit synchronous acquisition transmitting/receiving coil and reference coil, the noise signal gathering by computing reference coil and the maximum correlation of NMR signal, realize the laying of reference coil optimum position and quantity, the in the situation that of signal and noise statistics the unknown, adopt variable step size adaptive algorithm, offset to greatest extent the correlation noise in transmitting/receiving coil, realize the extraction that the complicated very noisy of many field sources disturbs lower NMR signal, the method can solve near village effectively and nuclear magnetic resonance detection in surrounding region of city is disturbed many, multiple interference noise data are difficult to separated problem, improved instrument interference free performance, for near village and surrounding region of city searching ground water a kind of reliable sniffer and method are provided.
Above-mentioned three kinds of methods adopt respectively the same coil direct detection of transmitting-receiving, the separated detection of dual-mode antenna to improve reference coil in detection sensitivity and strong jamming situation and offset noise detection means, determine that selecting which kind of mode of operation is all according to operating personnel's experience, does not have theoretical foundation as guidance.If can be by the extraction of the real-time signal-to-noise characteristic of field data specifically being determined to the impact size of noise on signal, thereby analysis result instructs instrument to determine mode of operation and relevant parameter is set as passing judgment on criterion according to this, this will be avoided, and due to mode of operation, to select incorrect or parameter that the unreasonable detecting strategy causing is set invalid, same detection place modification pattern or parameter etc. are surveyed the generation of event repeatedly, cause the loss of a large amount of human and material resources and time.
Summary of the invention
The present invention is directed in prior art, exist due to mode of operation, to select incorrect or parameter that the unreasonable detecting strategy causing is set invalid, same detection place modification pattern or parameter etc. are surveyed the generation of event repeatedly, cause the deficiency of the loss of a large amount of human and material resources and time, proposed multi-operation mode nuclear magnetic signal sniffer and method that real-time signal-to-noise characteristic is extracted.
The present invention realizes like this, the multi-operation mode nuclear magnetic signal sniffer that a kind of real-time signal-to-noise characteristic is extracted, this device comprises master control PC 1, system communication module 2, nuclear magnetic signal acquisition module 3, transmitter module 5, coil 4, wireless router 6 and many detection computations machines, master control PC 1 is selected the system works pattern of acquiescence through system communication module 2 be the same coil modes of transmitting-receiving, and configuration parameter setting; Master control PC 1, through transmitter module 5 and coil 4, is launched respectively 5 pulse squares, starts nuclear magnetic signal acquisition module 3 collection signals; Wireless router 6 produces WLAN (wireless local area network), many detection computations machines are by the data of storage on LAN-sharing master control PC 1, use MRS signal analysis software in many detection computations machines to carry out the signal-to-noise characteristic analysis of nuclear magnetic signal, and then extraction characteristic parameter, this characteristic parameter is fed back to master control PC 1 by WLAN (wireless local area network); The signal to noise ratio (S/N ratio) that master control PC 1 feeds back with this and noise type are revised system works pattern, select to adopt the same coil modes of transmitting-receiving, transmitting-receiving separate winding pattern, a kind of with in three kinds of patterns of reference coil pattern, and arrange according to selected mode of operation configuration parameter, under normal 16 pulse squares, start nuclear magnetic signal acquisition module 8 collection signals, complete the meticulous effective detection to underground water.
Further, described nuclear magnetic signal acquisition module 3 comprises: with the FPGA control circuit 14 that the communication of master control PC is connected, FPGA control circuit 14 connection mode handover modules 7, select different coil working patterns by mode switch module 7; Also comprise successively connect join detune circuit 8, preposition low noise amplifier circuit 9, narrow band filter 10, programmable amplifying circuit 11, analog to digital conversion circuit 12, by analog to digital conversion circuit 12, be connected to the input end of FPGA control circuit 14, the signal of collection is passed to master control PC by FPGA control circuit 14 after treatment, FPGA control circuit 14 is connected with narrow band filter 10 by a centre frequency control module 13, and the centre frequency of narrow band filter 10 is controlled; FPGA control circuit 14 is connected with programmable amplifying circuit 11, and the enlargement factor of programmable amplifying circuit 11 is controlled.
The present invention also provides a kind of detection method of multi-operation mode nuclear magnetic signal sniffer, and the method comprises the steps:
A. selected place, first selects default system mode of operation for the same coil modes of transmitting-receiving;
B. measure local terrestrial magnetic field value, " terrestrial magnetic field-Rameau that frequency translation module " in the calculation of parameter of being controlled on software by master control PC 1 calculates Rameau that frequency; Measure and calculate coil 4 and join the value of detune circuit (8);
C. master control PC 1 is configured parameter setting through system communication module 2 and selected system works pattern, comprise stacking fold, amplifier quality factor q, threshold value, excite duration, stimulating frequency, can release duration, switch duration, gather duration, inductance, join humorous electric capacity and pulse square;
D. setting completed at master control PC 1, to control on software configuration parameter, by master control PC 1, to transmitter module 5 and coil 4, sends instruction, launches high-power alternating impulse, starts nuclear magnetic signal acquisition module 3 simultaneously, starts the collection of nuclear magnetic signal;
E. nuclear magnetic signal acquisition module 3 collection signals finish, and store data in master control PC 1 assigned address;
F. wireless router 6 produces WLAN (wireless local area network) by network settings, and master control PC 1 and Duo Tai detection computations machine are placed in to this WLAN (wireless local area network), makes them in can mutually sharing data mode;
The nuclear magnetic signal data of g. storing on many detection computations machine Real-Time Sharing master control PCs 1, and by this data importing MRS signal analysis software, carry out in real time signal-to-noise characteristic extraction, extract the characteristic parameters such as signal to noise ratio (S/N ratio) and noise type;
H. characteristic parameter feeds back to master control PC 1 through WLAN (wireless local area network), usings this as passing judgment on criterion selective system mode of operation and being configured parameter setting, and the NMR signal that adopts 16 pulse squares to carry out efficient fine is measured.
Further, signal-to-noise characteristic extracting method comprises the following steps:
1), adopt t distribution inspection method, the larger spike noise signal of amplitude is worked as to the value of making sad work of it point rejects, in time domain, realize the separation of spike noise in noisy nuclear magnetic resonance detectable signal, and calculate spike noise institute accounting, if the accounting >70% of spike noise institute, according to step 2) reselect mode of operation after, reduce the threshold value in configuration parameter; If the accounting <30% of spike noise institute, according to step 2) reselect mode of operation after, without the threshold value of revising in configuration parameter;
2), the noisy nuclear magnetic resonance detectable signal of rejecting after spike noise is carried out to spectrum analysis, at frequency domain, carry out the calculating of signal to noise ratio snr, if SNR<0dB, feed back to master control PC information and make it select tape reference coil pattern, and the quality factor Q=15 of amplifier in configuration parameter is set, and stacking fold N selects 32-48 time; If 0<SNR<6dB, feeds back to master control PC information and make it to select transmitting-receiving separate winding pattern, and the quality factor Q=15 of amplifier in configuration parameter is set, stacking fold N selects 32 times; If SNR>6dB, feeds back to master control PC information and make it to select same coil 4 patterns of transmitting-receiving, and the quality factor Q=10 of amplifier in configuration parameter is set, stacking fold N selects 16-24 time.
Compared with prior art, beneficial effect is in the present invention: the present invention adopts NMR signal acquisition module the method based on extract real-time characteristic parameter based on FPGA to realize the collection of nuclear magnetic resonance detectable signal under multiple-working mode.Specifically utilize wireless router many detection computations machines in can allowing the same LAN (Local Area Network) of distance to share the nuclear magnetic signal that master control PC gathers, adopt MRS signal analysis software and the many people of special algorithm to realize the real-time signal-to-noise characteristic analysis to field data simultaneously, extract characteristic parameter, with this, judge field condition signal and noise profile situation, analysis result is fed back to master control PC, and operating personnel realize on this basis to the selection of system optimum working mode and the setting of corresponding configuration parameter.Adopt the technology of the present invention can avoid system works pattern or configuration parameter to select reduction improper and work efficiency that cause, can improve greatly precision and the accuracy of detection, effectively shorten engineering time.
Accompanying drawing explanation
Fig. 1 is the device structure schematic diagram that the embodiment of the present invention provides;
Fig. 2 is the structured flowchart of accompanying drawing 1 center magnetic signal acquisition module;
1 master control PC, 2 system communication modules, 3 nuclear magnetic signal acquisition modules, 4 coils, 5 transmitter modules, 6 wireless routers, 7 patterns are switched, and 8 join detune circuit, 9 preposition low noise amplifier circuits, 10 narrow band filters, 11 programmable amplifying circuits, 12 analog to digital conversion circuits, 13 centre frequency control modules,, 14FPGA control circuit, 30,31,3N detection computations machine.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 1, the multi-operation mode nuclear magnetic signal sniffer extracting based on real-time signal-to-noise characteristic, this device comprises master control PC 1, system communication module 2, nuclear magnetic signal acquisition module 3, coil 4, wireless router 6 and many detection computations machines 30,31 ... 3N, wherein, master control PC 1 is connected by data line with nuclear magnetic signal acquisition module 3 by system communication module 2, the collection terminal connecting coil 4 of nuclear magnetic signal acquisition module 3; Wireless router 6 is set and by forming network between master control PC 1 and many detection computations machines, connects, master control PC 1 is selected the system works pattern (receiving and dispatching same coil modes) of acquiescence through system communication module 2, and configuration parameter setting; Master control PC 1, through transmitter module 5 and coil 4, is launched respectively 5 pulse squares, starts nuclear magnetic signal acquisition module 3 collection signals.Wireless router 6 produces WLAN (wireless local area network), detection computations machine 30,31 ... 3N is by the data of storage on LAN-sharing master control PC 1, use MRS signal analysis software to carry out the signal-to-noise characteristic analysis of nuclear magnetic signal, and then extraction characteristic parameter, this characteristic parameter is fed back to master control PC 1 by WLAN (wireless local area network).The signal to noise ratio (S/N ratio) that master control PC 1 feeds back with this and noise type are revised system works pattern, select to adopt the same coil modes of transmitting-receiving, transmitting-receiving separate winding pattern, a kind of with in three kinds of patterns of reference coil pattern, and configuration parameter setting, under normal 16 pulse squares, start nuclear magnetic signal acquisition module 8 collection signals, complete the meticulous effective detection to underground water.
As shown in Figure 2, nuclear magnetic signal acquisition module 3 comprises: with the FPGA control circuit 14 that 1 communication of master control PC is connected, FPGA control circuit 14 connection mode handover modules 7, select different coil working patterns by mode switch module 7; Also comprise successively connect join detune circuit 8, preposition low noise amplifier circuit 9, narrow band filter 10, programmable amplifying circuit 11, analog to digital conversion circuit 12, by analog to digital conversion circuit 12, be connected to the input end of FPGA control circuit 14, the signal of collection is passed to master control PC 1 by FPGA control circuit 14 after treatment, FPGA control circuit 14 is connected with narrow band filter 10 by a centre frequency control circuit 13, and the centre frequency of narrow band filter 10 is controlled; FPGA control circuit 14 is connected with programmable amplifying circuit 11, and the enlargement factor of programmable amplifying circuit 11 is controlled.
Specific works process is:
The operation of the multi-operation mode nuclear magnetic signal sniffer extracting based on real-time signal-to-noise characteristic is controlled by master control PC 1 and is responsible for.The system works pattern of first selected acquiescence: receive and dispatch same coil modes, master control PC 1 is controlled on software and is carried out configuration parameter setting at it, this parameter comprises: the quality factor q of stacking fold, amplifier, threshold value, excite duration, stimulating frequency, can release duration, switch duration, gather duration, inductance, join humorous electric capacity and pulse square number and size etc., general in detection selected to excite duration be T=40ms.Master pulse moment sequence is set and arranges from small to large, the number of pulse square is set to 5: 400.0,1601.0,3044.0,6633.0,10000.0Ams, to realize fast the bigness scale of underground 150m depth signal and noisiness; Wherein pulse square is the product of transmitter current value and launch time, i.e. computing formula: Q=I*T.The larger transmitter current of pulse square is larger, and investigation depth is darker, by changing successively pulse square, changes transmitter current, thereby completes underground layered probe work from shallow to deep.Master control PC 1 is assigned enabled instruction by system communication module 2 to nuclear magnetic signal acquisition module 3, and the PC of master control simultaneously 1 is controlled transmitter module 5, through coil 4, launches respectively 5 pulse squares, excites hydrogen proton in underground water, and nuclear magnetic signal acquisition module 3 is started working.
FPGA control circuit 14 is by master control PC 1 downloading control word, centre frequency control module 13, programmable amplifying circuit 11, analog to digital conversion circuit 12 are controlled, meanwhile, the configuration parameter that FPGA control circuit 14 reads in master control PC 1 arranges control mode switch module 7.Coil 4 and join the constantly high-power alternating impulse of transmitting of detune circuit 5, to excite underground hydrogen proton.Large current emission finished after a period of time, coil 4 and join detune circuit 8 and start to receive the NMR signal that hydrogen proton produces.The NMR signal receiving is tentatively amplified through preposition low noise amplifier circuit 9.Signal after tentatively amplifying is carried out to filtering through narrow band filter 10 and programmable amplifying circuit 11 amplifies, to reach the amplitude that analog to digital conversion circuit 12 can be identified.Wherein, narrow band filter 10 is by the 13 triggering work of centre frequency control module, and programmable amplifying circuit 11 determines signal amplification factor by FPGA control circuit 14 control words.Signal after program control amplification is quantized into digital quantity by analog to digital conversion circuit 14, by FPGA control circuit 14, gathers and store NMR signal.Master control PC 1 reads the signal being stored in FPGA control circuit 14, and stores data into assigned address, thereby completes the collection of NMR signal.
When NMR signal gathers, wireless router 6 is set and produces WLAN (wireless local area network), make master control PC 1 and detection computations machine 30,31 ... 3N is in this WLAN (wireless local area network), detection computations machine 30,31 ... 3N is by the nuclear magnetic signal data of storage on LAN-sharing master control PC 1, adopt MRS signal analysis software, use t distribution inspection algorithm to carry out signature analysis to these nuclear magnetic signal data, the spike noise signal that rejecting amplitude is larger, and calculate the shared ratio of spike noise.The noisy nuclear magnetic resonance detectable signal of rejecting after spike noise is carried out to spectrum analysis, calculate signal to noise ratio (S/N ratio).The signal to noise ratio (S/N ratio) (SNR) of the shared ratio of spike noise and collection signal etc. is extracted characteristic parameter, this characteristic parameter is fed back to master control PC 1 by WLAN (wireless local area network), determine whether to revise the configuration parameters such as system works model selection, threshold value, amplifier quality factor q and stacking fold, thereby in time for follow-up detection operations provides theoretical foundation.
The multi-operation mode nuclear magnetic signal detection method extracting based on real-time signal-to-noise characteristic, comprises following order and step:
A. selected experimental site, first selects default system mode of operation for the same coil modes of transmitting-receiving;
B. measure local terrestrial magnetic field value, " terrestrial magnetic field-Rameau that frequency translation module " in the parameter calculating module of being controlled on software by master control PC 1 calculates Rameau that frequency; Measure and calculate coil 4 and join the value of detune circuit 8;
C. master control PC 1 is configured parameter setting through system communication module 2 and selected system works model selection, comprise stacking fold, amplifier quality factor q, threshold value, excite duration, stimulating frequency, can release duration, switch duration, gather duration, inductance, join the parameter values such as humorous electric capacity and pulse square (5);
D. setting completed at master control PC 1, to control on software configuration parameter, by master control PC 1, to transmitter module 5 and coil 4, sends instruction, launches high-power alternating impulse, starts nuclear magnetic signal acquisition module 3 simultaneously, starts the collection of nuclear magnetic signal;
E. nuclear magnetic signal acquisition module 3 collection signals finish, and store data in master control PC 1 assigned address;
F. wireless router 6 produces WLAN (wireless local area network) by network settings, by master control PC 1 and detection computations machine 30,31 ... 3N is placed in this WLAN (wireless local area network), makes them in can mutually sharing data mode;
G. detection computations machine 30,31 ... the nuclear magnetic signal data of storage on 3N Real-Time Sharing master control PC 1, and by this data importing MRS signal analysis software, carry out in real time signal-to-noise characteristic extraction, extract the characteristic parameters such as signal to noise ratio (S/N ratio) and noise type;
H. characteristic parameter feeds back to master control PC 1 operating personnel through WLAN (wireless local area network), using that this selects more appropriate system works model selection (to receive and dispatch same coil as passing judgment on criterion, transmitting-receiving separate winding, a kind ofly with in three kinds of patterns of reference coil) and carry out suitable configuration parameter setting, adopt 16 pulse squares (400.0, 563.0, 611.0, 749.0, 926.0, 1122.0, 1601.0, 2117.0, 2508.0, 3044.0, 3658.0, 4435.0, 5551.0, 6633.0, 7800.0, 9000.0, 10000.0, 10200.0Ams) measure, so that the effective detection of meticulousr realization to underground water.
Embodiment 1
Master control PC 1 is selected the system works pattern of acquiescence through system communication module 2: receive and dispatch same coil 4 patterns, and be configured parameter setting according to the working method of selecting; Master control PC 1, through transmitter module 5 and coil 4, is launched high-power alternating impulse, starts nuclear magnetic signal acquisition module 3 collection signals simultaneously.Wireless router 11 produces WLAN (wireless local area network), make master control PC 1 and detection computations machine 30,31 ... 3N is in this LAN (Local Area Network), detection computations machine 30,31 ... 3N is by the data of storage on LAN-sharing master control PC 1, use MRS signal analysis software to carry out the signal-to-noise characteristic analysis of nuclear magnetic signal, and then extraction characteristic parameter, this characteristic parameter is fed back to master control PC 1 by WLAN (wireless local area network).
The multi-operation mode nuclear magnetic signal detection method extracting based on real-time signal-to-noise characteristic, comprises following order and step:
A. selected experimental site, selects default system mode of operation for the same coil modes of transmitting-receiving; The coil in nuclear magnetic signal acquisition module 34 adopts same coil when the large electric current of transmitting and reception nuclear magnetic signal;
B. measure local terrestrial magnetic field value, " terrestrial magnetic field-Rameau that frequency translation module " in the parameter calculating module of being controlled on software by master control PC 1 calculates Rameau that frequency; Measure and calculate coil 4 and join the value of detune circuit 8;
C. master control PC 1 is through system communication module 2, according to the same coil modes of transmitting-receiving, be configured parameter setting, comprise stacking fold, amplifier quality factor q, threshold value, excite duration, stimulating frequency, can release duration, switch duration, gather duration, inductance, join the parameter values such as humorous electric capacity and pulse square (5);
D. setting completed at master control PC 1, to control on software configuration parameter, by master control PC 1, to transmitter module 5 and coil 4, sends instruction, launches high-power alternating impulse, starts nuclear magnetic signal acquisition module 3 simultaneously, starts the collection of nuclear magnetic signal;
E. nuclear magnetic signal acquisition module 8 collection signals finish, and store data in master control PC 1 assigned address;
F. wireless router 6 produces WLAN (wireless local area network) by network settings, by master control PC 1 and detection computations machine 30,31 ... 3N is placed in this WLAN (wireless local area network), makes them in can mutually sharing data mode;
G. detection computations machine 30,31 ... the nuclear magnetic signal data of storage on 3N Real-Time Sharing master control PC 1, and this data upload to MRS signal analysis software is carried out to signal-to-noise characteristic analysis in real time, extract characteristic parameter, this characteristic parameter comprises signal to noise ratio (S/N ratio) (SNR), noise type and content etc.;
H. characteristic parameter feeds back to master control PC 1 operating personnel through WLAN (wireless local area network), if signal to noise ratio (S/N ratio) (SNR) is in the scope of SNR>6dB, can judge immediately that this area is applicable to adopting the working method of the same coil modes of transmitting-receiving, 0<SNR<6dB in the present embodiment, adopts the working method of receiving and dispatching separation type coil pattern.According to the characteristic parameter of on-the-spot Real-time Feedback, determine without changing existing system works pattern, carry out suitable configuration parameter setting, adopt 16 pulse squares so that the effective detection of meticulousr realization to underground water.
Embodiment 2
Master control PC 1 is selected the system works pattern of acquiescence through system communication module 2: receive and dispatch same coil modes, and be configured parameter setting according to the working method of selecting; Master control PC 1, through transmitter module 5 and coil 4, is launched high-power alternating impulse, starts nuclear magnetic signal acquisition module 3 collection signals simultaneously.Wireless router 6 produces WLAN (wireless local area network), make master control PC 1 and detection computations machine 30,31 ... 3N is in this LAN (Local Area Network), detection computations machine 30,31 ... 3N is by the data of storage on LAN-sharing master control PC 1, use MRS signal analysis software to carry out the signal-to-noise characteristic analysis of nuclear magnetic signal, and then extraction characteristic parameter, this characteristic parameter is fed back to master control PC 1 by WLAN (wireless local area network).
The multi-operation mode nuclear magnetic signal detection method extracting based on real-time signal-to-noise characteristic, comprises following order and step:
A. selected experimental site, selects default system mode of operation for the same coil modes of transmitting-receiving; The coil in nuclear magnetic signal acquisition module 34 adopts same coil when the large electric current of transmitting and reception nuclear magnetic signal;
B. measure local terrestrial magnetic field value, " terrestrial magnetic field-Rameau that frequency translation module " in the parameter calculating module of being controlled on software by master control PC 1 calculates Rameau that frequency; Measure and calculate coil 4 and join the value of detune circuit 8;
C. master control PC 1 is through system communication module 2, according to the same coil modes 4 of transmitting-receiving, be configured parameter setting, comprise stacking fold, amplifier quality factor q, threshold value, excite duration, stimulating frequency, can release duration, switch duration, gather duration, inductance, join the parameter values such as humorous electric capacity and pulse square (5);
D. setting completed at master control PC 1, to control on software configuration parameter, by master control PC 1, to transmitter module 5 and coil 4, sends instruction, launches high-power alternating impulse, starts nuclear magnetic signal acquisition module 3 simultaneously, starts the collection of nuclear magnetic signal;
E. nuclear magnetic signal acquisition module 3 collection signals finish, and store data in master control PC 1 assigned address;
F. wireless router 6 produces WLAN (wireless local area network) by network settings, by master control PC 1 and detection computations machine 30,31 ... 3N is placed in this WLAN (wireless local area network), makes them in can mutually sharing data mode;
G. detection computations machine 30,31 ... the nuclear magnetic signal data of storage on 3N Real-Time Sharing master control PC 1, and this data upload to MRS signal analysis software is carried out to signal-to-noise characteristic analysis in real time, extract characteristic parameter, this characteristic parameter comprises signal to noise ratio (S/N ratio) (SNR), noise type and content etc.;
H. characteristic parameter feeds back to master control PC 1 operating personnel through WLAN (wireless local area network), if signal to noise ratio (S/N ratio) (SNR) is in the scope of SNR>6dB, can judge immediately that this area is applicable to adopting the working method of the same coil modes of transmitting-receiving, in the present embodiment; SNR<0dB, adopts the working method with reference coil pattern.According to the characteristic parameter of on-the-spot Real-time Feedback, select more appropriate system works model selection, lay receiving coil and carry out suitable configuration parameter setting, adopt 16 pulse squares so that the effective detection of meticulousr realization to underground water.
Embodiment 3
Master control PC 1 is selected the system works pattern of acquiescence through system communication module 2: receive and dispatch same coil modes, and be configured parameter setting according to the working method of selecting; Master control PC 1, through transmitter module 5 and coil 4, is launched high-power alternating impulse, starts nuclear magnetic signal acquisition module 3 collection signals simultaneously.Wireless router 6 produces WLAN (wireless local area network), make master control PC 1 and detection computations machine 30,31 ... 3N is in this LAN (Local Area Network), detection computations machine 30,31 ... 3N is by the data of storage on LAN-sharing master control PC 1, use MRS signal analysis software to carry out the signal-to-noise characteristic analysis of nuclear magnetic signal, and then extraction characteristic parameter, this characteristic parameter is fed back to master control PC 1 by WLAN (wireless local area network).
The multi-operation mode nuclear magnetic signal detection method extracting based on real-time signal-to-noise characteristic, comprises following order and step:
A. selected experimental site, selects default system mode of operation for the same coil modes of transmitting-receiving; The coil in nuclear magnetic signal acquisition module 34 adopts same coil when the large electric current of transmitting and reception nuclear magnetic signal;
B. measure local terrestrial magnetic field value, " terrestrial magnetic field-Rameau that frequency translation module " in the parameter calculating module of being controlled on software by master control PC 1 calculates Rameau that frequency; Measure and calculate coil 4 and join the value of detune circuit 8;
C. master control PC 1 is through system communication module 2, according to the same coil modes of transmitting-receiving, be configured parameter setting, comprise stacking fold, amplifier quality factor q, threshold value, excite duration, stimulating frequency, can release duration, switch duration, gather duration, inductance, join the parameter values such as humorous electric capacity and pulse square (5);
D. setting completed at master control PC 1, to control on software configuration parameter, by master control PC 1, to transmitter module 5 and coil 4, sends instruction, launches high-power alternating impulse, starts nuclear magnetic signal acquisition module 3 simultaneously, starts the collection of nuclear magnetic signal;
E. nuclear magnetic signal acquisition module 3 collection signals finish, and store data in master control PC 1 assigned address;
F. wireless router 6 produces WLAN (wireless local area network) by network settings, by master control PC 1 and detection computations machine 30,31 ... 3N is placed in this WLAN (wireless local area network), makes them in can mutually sharing data mode;
G. detection computations machine 30,31 ... the nuclear magnetic signal data of storage on 3N Real-Time Sharing master control PC 1, and this data upload to MRS signal analysis software is carried out to signal-to-noise characteristic analysis in real time, extract characteristic parameter, this characteristic parameter comprises signal to noise ratio (S/N ratio) (SNR), noise type and content etc.;
H. characteristic parameter feeds back to master control PC 1 operating personnel through WLAN (wireless local area network), if signal to noise ratio (S/N ratio) (SNR) in the scope of SNR>6dB, can judge this area immediately, is applicable to adopting the working method of the same coil modes of transmitting-receiving.According to the characteristic parameter of on-the-spot Real-time Feedback, select more appropriate system works pattern, lay one or more reference coils and be equipped with many covers signal acquiring system of being controlled by FPGA as shown in Figure 2, and carry out suitable configuration parameter setting, adopt 16 pulse squares so that the effective detection of meticulousr realization to underground water.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (4)
1. the multi-operation mode nuclear magnetic signal sniffer that real-time signal-to-noise characteristic is extracted, it is characterized in that, this device comprises master control PC (1), system communication module (2), nuclear magnetic signal acquisition module (3), transmitter module (5), coil (4), wireless router (6) and many detection computations machines, master control PC (1) is selected the system works pattern of acquiescence through system communication module (2) be the same coil modes of transmitting-receiving, and configuration parameter setting; Master control PC (1), through transmitter module (5) and coil (4), is launched respectively 5 pulse squares, starts nuclear magnetic signal acquisition module (3) collection signal; Wireless router (6) produces WLAN (wireless local area network), many detection computations machines are by the data of the upper storage of LAN-sharing master control PC (1), use MRS signal analysis software in many detection computations machines to carry out the signal-to-noise characteristic analysis of nuclear magnetic signal, and then extraction characteristic parameter, this characteristic parameter is fed back to master control PC (1) by WLAN (wireless local area network); The signal to noise ratio (S/N ratio) that master control PC (1) feeds back with this and noise type are revised system works pattern, select to adopt the same coil modes of transmitting-receiving, transmitting-receiving separate winding pattern, a kind of with in three kinds of patterns of reference coil pattern, and arrange according to selected mode of operation configuration parameter, under normal 16 pulse squares, start nuclear magnetic signal acquisition module (8) collection signal, complete the meticulous effective detection to underground water.
2. the multi-operation mode nuclear magnetic signal sniffer extracting according to real-time signal-to-noise characteristic claimed in claim 1, it is characterized in that, described nuclear magnetic signal acquisition module (3) comprising: the FPGA control circuit (14) being connected with the communication of master control PC, FPGA control circuit (14) connection mode handover module (7), selects different coil working patterns by mode switch module (7); Also comprise successively connect join detune circuit (8), preposition low noise amplifier circuit (9), narrow band filter (10), programmable amplifying circuit (11), analog to digital conversion circuit (12), by analog to digital conversion circuit (12), be connected to the input end of FPGA control circuit (14), the signal gathering is controlled to electricity (14) by FPGA after treatment and be passed to master control PC, FPGA control circuit (14) is connected with narrow band filter (10) by a centre frequency control module (13), and the centre frequency of narrow band filter (10) is controlled; FPGA control circuit (14) is connected with programmable amplifying circuit (11), and the enlargement factor of programmable amplifying circuit (11) is controlled.
3. according to the detection method of multi-operation mode nuclear magnetic signal sniffer claimed in claim 1, it is characterized in that, the method comprises the steps:
A. selected place, first selects default system mode of operation for the same coil modes of transmitting-receiving;
B. measure local terrestrial magnetic field value, " terrestrial magnetic field-Rameau that frequency translation module " by master control PC (1), controlled in the calculation of parameter on software calculates Rameau that frequency; Measure and calculate coil (4) and join the value of detune circuit (8);
C. master control PC (1) is configured parameter setting through system communication module (2) and selected system works pattern, comprise stacking fold, amplifier quality factor q, threshold value, excite duration, stimulating frequency, can release duration, switch duration, gather duration, inductance, join humorous electric capacity and pulse square;
D. setting completed at master control PC (1), to control on software configuration parameter, by master control PC (1), to transmitter module (5) and coil (4), send instruction, launch high-power alternating impulse, start nuclear magnetic signal acquisition module (3) simultaneously, start the collection of nuclear magnetic signal;
E. nuclear magnetic signal acquisition module (3) collection signal finishes, and stores data in master control PC (1) assigned address;
F. wireless router (6) produces WLAN (wireless local area network) by network settings, and master control PC (1) and many detection computations machines are placed in to this WLAN (wireless local area network), makes them in can mutually sharing data mode;
G. the nuclear magnetic signal data that many detection computations machine Real-Time Sharing master control PCs (1) are above stored, and by this data importing MRS signal analysis software, carry out in real time signal-to-noise characteristic extraction, extract the characteristic parameters such as signal to noise ratio (S/N ratio) and noise type;
H. characteristic parameter feeds back to master control PC (1) through WLAN (wireless local area network), usings this as passing judgment on criterion selective system mode of operation and being configured parameter setting, and the NMR signal that adopts 16 pulse squares to carry out efficient fine is measured.
4. according to multi-operation mode nuclear magnetic signal detection method claimed in claim 3, it is characterized in that, signal-to-noise characteristic extracting method comprises the following steps:
1), adopt t distribution inspection method, the larger spike noise signal of amplitude is worked as to the value of making sad work of it point rejects, in time domain, realize the separation of spike noise in noisy nuclear magnetic resonance detectable signal, and calculate spike noise institute accounting, if the accounting >70% of spike noise institute, according to step 2) reselect mode of operation after, reduce the threshold value in configuration parameter; If the accounting <30% of spike noise institute, according to step 2) reselect mode of operation after, without the threshold value of revising in configuration parameter;
2), the noisy nuclear magnetic resonance detectable signal of rejecting after spike noise is carried out to spectrum analysis, at frequency domain, carry out the calculating of signal to noise ratio snr, if SNR<0dB, feed back to master control PC information and make it select tape reference coil pattern, and the quality factor Q=15 of amplifier in configuration parameter is set, and stacking fold N selects 32-48 time; If 0<SNR<6dB, feeds back to master control PC information and make it to select transmitting-receiving separate winding pattern, and the quality factor Q=15 of amplifier in configuration parameter is set, stacking fold N selects 32 times; If SNR>6dB, feeds back to master control PC information and make it to select same coil 4 patterns of transmitting-receiving, and the quality factor Q=10 of amplifier in configuration parameter is set, stacking fold N selects 16-24 time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410175126.2A CN103984032B (en) | 2014-04-28 | 2014-04-28 | Multiple-work-mode nuclear magnetism signal detection device and method for real-time signal-noise characteristic extraction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410175126.2A CN103984032B (en) | 2014-04-28 | 2014-04-28 | Multiple-work-mode nuclear magnetism signal detection device and method for real-time signal-noise characteristic extraction |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103984032A true CN103984032A (en) | 2014-08-13 |
| CN103984032B CN103984032B (en) | 2017-02-15 |
Family
ID=51276074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410175126.2A Expired - Fee Related CN103984032B (en) | 2014-04-28 | 2014-04-28 | Multiple-work-mode nuclear magnetism signal detection device and method for real-time signal-noise characteristic extraction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103984032B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104991206A (en) * | 2015-05-05 | 2015-10-21 | 东北大学 | Magnetic field measurement method based on surface plasma resonance technology |
| WO2016165432A1 (en) * | 2015-04-11 | 2016-10-20 | 宁宝利 | Ground wire communication method and system |
| CN106814400A (en) * | 2017-03-23 | 2017-06-09 | 吉林大学 | Water emitter and method of work are visited based on the nuclear magnetic resonance that array inversion is charged |
| CN109343129A (en) * | 2018-11-14 | 2019-02-15 | 吉林大学 | A kind of big covering ground nuclear magnetic resonance detection device and method based on wireless bridge |
| CN110456420A (en) * | 2019-08-13 | 2019-11-15 | 吉林大学 | Based on proximal end reference coil nuclear magnetic resonance underground water detectable signal noise cancellation method |
| CN110887651A (en) * | 2019-12-02 | 2020-03-17 | 北京航天试验技术研究所 | Rotor fault weak signal extraction method based on sensor resonance filtering |
| CN111239837A (en) * | 2020-02-20 | 2020-06-05 | 吉林大学 | Ground nuclear magnetic resonance signal parameter extraction method based on MCMC |
| CN111411944A (en) * | 2020-04-27 | 2020-07-14 | 无锡量子感知研究所 | Nuclear magnetic resonance logging while drilling instrument and working mode control method and system thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4724385A (en) * | 1986-11-03 | 1988-02-09 | Paramagnetic Logging, Inc. | Acoustic paramagnetic logging tool |
| US6177794B1 (en) * | 1997-05-13 | 2001-01-23 | The Regents Of The University Of California | Use of earth field spin echo NMR to search for liquid minerals |
| CN2518116Y (en) * | 2001-12-17 | 2002-10-23 | 北京中科健超导有限责任公司 | Nuclear magnetic resonance ground water layer detecting instrument |
| CN102053280A (en) * | 2010-11-10 | 2011-05-11 | 吉林大学 | Nuclear magnetic resonance ground water detection system with reference coils and detection method |
| CN102096111A (en) * | 2010-12-07 | 2011-06-15 | 吉林大学 | Transmitting-receiving antenna separation type nuclear magnetic resonance water exploring device and water exploring method |
-
2014
- 2014-04-28 CN CN201410175126.2A patent/CN103984032B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4724385A (en) * | 1986-11-03 | 1988-02-09 | Paramagnetic Logging, Inc. | Acoustic paramagnetic logging tool |
| US6177794B1 (en) * | 1997-05-13 | 2001-01-23 | The Regents Of The University Of California | Use of earth field spin echo NMR to search for liquid minerals |
| CN2518116Y (en) * | 2001-12-17 | 2002-10-23 | 北京中科健超导有限责任公司 | Nuclear magnetic resonance ground water layer detecting instrument |
| CN102053280A (en) * | 2010-11-10 | 2011-05-11 | 吉林大学 | Nuclear magnetic resonance ground water detection system with reference coils and detection method |
| CN102096111A (en) * | 2010-12-07 | 2011-06-15 | 吉林大学 | Transmitting-receiving antenna separation type nuclear magnetic resonance water exploring device and water exploring method |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016165432A1 (en) * | 2015-04-11 | 2016-10-20 | 宁宝利 | Ground wire communication method and system |
| CN104991206A (en) * | 2015-05-05 | 2015-10-21 | 东北大学 | Magnetic field measurement method based on surface plasma resonance technology |
| CN106814400A (en) * | 2017-03-23 | 2017-06-09 | 吉林大学 | Water emitter and method of work are visited based on the nuclear magnetic resonance that array inversion is charged |
| CN109343129A (en) * | 2018-11-14 | 2019-02-15 | 吉林大学 | A kind of big covering ground nuclear magnetic resonance detection device and method based on wireless bridge |
| CN110456420A (en) * | 2019-08-13 | 2019-11-15 | 吉林大学 | Based on proximal end reference coil nuclear magnetic resonance underground water detectable signal noise cancellation method |
| CN110887651A (en) * | 2019-12-02 | 2020-03-17 | 北京航天试验技术研究所 | Rotor fault weak signal extraction method based on sensor resonance filtering |
| CN111239837A (en) * | 2020-02-20 | 2020-06-05 | 吉林大学 | Ground nuclear magnetic resonance signal parameter extraction method based on MCMC |
| CN111239837B (en) * | 2020-02-20 | 2021-01-05 | 吉林大学 | Ground magnetic resonance signal parameter extraction method based on MCMC |
| CN111411944A (en) * | 2020-04-27 | 2020-07-14 | 无锡量子感知研究所 | Nuclear magnetic resonance logging while drilling instrument and working mode control method and system thereof |
| CN111411944B (en) * | 2020-04-27 | 2024-04-09 | 国仪石油技术(无锡)有限公司 | Nuclear magnetic resonance logging while drilling instrument and working mode control method and system thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103984032B (en) | 2017-02-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103984032A (en) | Multiple-work-mode nuclear magnetism signal detection device and method for real-time signal-noise characteristic extraction | |
| CN203838352U (en) | Multi-work-mode nuclear magnetic signal detection apparatus | |
| CN102053280B (en) | Nuclear magnetic resonance ground water detection system with reference coils and detection method | |
| CN102096111B (en) | Transmitting-receiving antenna separation type nuclear magnetic resonance water exploring device and water exploring method | |
| CN103344996B (en) | Serial-resonant nuclear magnetic resonance, NMR detection device and detection method | |
| CN108776355B (en) | Tunnel focuses depth measurement type three-dimensional induced polarization forward probe instrument system | |
| CN103809206B (en) | Nuclear magnetic resonance and transient electromagnetic combined use underground water detection device and detection method | |
| CN104280780B (en) | Nuclear magnetic resonance and transient electromagnetic combined instrument and method of work | |
| CN106383364B (en) | A kind of pseudorandom frequency sweep nuclear magnetic resonance detection instrument | |
| CN203502550U (en) | Partial discharge live detection device | |
| CN103884920B (en) | Automatic sweep-frequency type inductance measuring meter and measuring method | |
| CN103955004B (en) | Four-channel nuclear magnetic resonance signal full-wave acquisition system and acquisition method | |
| CN103018781B (en) | 2D/3D nuclear magnetic resonance and transient electromagnetic combined instrument and outdoor operation method | |
| CN102012525A (en) | Distribution type multi-parameter deep electromagnetic section imaging system and measuring method thereof | |
| CN103837903B (en) | Underground full-wave nuclear magnetic resonance detection device based on wireless network | |
| WO2020057019A1 (en) | Parallel acquisition system and method employing multiple geophysical fields for exploration | |
| CN106290549A (en) | Magnetosonic multiparameter lossless detection method and device | |
| CN101980032A (en) | Method and device for measuring grounding resistance of lightning protection belt on top in wireless mode | |
| CN104502984B (en) | Specific frequency noise cancellation underground nuclear magnetic resonance detection device and detection method | |
| CN109765628B (en) | Vehicle-mounted prepolarization field magnetic resonance water source detection device and detection method | |
| CN103033849A (en) | Multichannel nuclear magnetic resonance underground water detecting instrument and field work method thereof | |
| CN107966737A (en) | Active field nuclear magnetic resonance detection device and detection method | |
| CN206002607U (en) | A kind of soil resistivity measurement and ground network ground resistance acquisition device | |
| CN103412341A (en) | Cooled coil nuclear magnetic resonance underground water detecting device and detecting method | |
| CN104625332B (en) | Stability evaluation system and method based on carbon dioxide welding input end electric signal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170215 Termination date: 20170428 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |