CN1292265C - Pseudo-random three frequency geoelectric response measuring device and method for geoelectric field - Google Patents
Pseudo-random three frequency geoelectric response measuring device and method for geoelectric field Download PDFInfo
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- CN1292265C CN1292265C CN 200510031324 CN200510031324A CN1292265C CN 1292265 C CN1292265 C CN 1292265C CN 200510031324 CN200510031324 CN 200510031324 CN 200510031324 A CN200510031324 A CN 200510031324A CN 1292265 C CN1292265 C CN 1292265C
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Abstract
The present invention discloses a pseudo-random three-frequency geoelectric response measuring device for geoelectric fields, which comprises a pseudo-random three-frequency signal transmitter and a pseudo-random double-channel three-frequency geoelectric field signal collection receiver, wherein the pseudo-random three-frequency signal transmitter comprises a single chip computer system, a driver, an inverter, a power source with direct current and high voltage, a sampling resistor, an overcurrent protection circuit, a current measurement circuit, a synchronous circuit, a frequency selection circuit, an undervoltage detection circuit and a sound alarm circuit; the pseudo-random double-channel three-frequency geoelectric field signal collection receiver is composed of at least two three-frequency signal extraction channels with the same parameter and a single chip computer system. When the present invention is utilized to carry out pseudo-random three-frequency electrical prospecting, the efficiency of electrical prospecting of frequency fields can be largely enhanced, energy sources can be saved and cost can be lowered; relative phase information of three frequency of a plurality of channels can be simultaneously obtained, which provides precious information which the existing electrical prospecting method can not provide for the discovery of excitation abnormality of sulfofication mineral products, the distinguishment of reasons for abnormality, and the definition of properties of abnormality.
Description
Technical field
The present invention relates to a kind of earth electric field pseudo-random three-frequency ground electroresponse measurement mechanism, especially relate in a kind of geophysical exploration the electric current that contains three predominant frequencies can be provided simultaneously, measure the ground electroresponse of three predominant frequencies simultaneously, comprise the amplitude that responds potential difference (PD) and the measurement mechanism of relative phase.
Background technology
Existing frequency field resistivity prospecting method, no matter be frequency domain electromagnetic methods, or the frequency field induced polarization method, the supply current of employing only contains a predominant frequency mostly, for example frequency variation method and odd harmonic method.In order to obtain the earth electric field response (this means different investigation depths or different geo-electrochemistry characteristics) of different frequency, perhaps need to change frequency (frequency variation method), perhaps need provide powerful electric current (odd harmonic method) because of the signal that obtains is too weak.This two classes scheme all is unfavorable for improving the efficient and the precision of earth electric field observation, also can't obtain the data of relative phase, and the information of differentiating ore body and/or non-ore deposit can not be provided.The present inventor once proposed once to supply simultaneously, survey the double frequency electrical method of two frequency earth electric fields responses, but its observed efficiency is still lower.
Summary of the invention
The objective of the invention is to overcome the above-mentioned existing defective that the geophysics electrical method is explored employed earth electric field power supply mode and measurement mechanism of reconnoitring, a kind of exploration efficiency height is provided, labour intensity is low, saves the genuine electroresponse measurement mechanism of earth electric field pseudo-random three-frequency bilateral of the energy.
Technical scheme of the present invention is as follows.
The present invention's earth electric field pseudo-random three-frequency ground electroresponse measurement mechanism comprises pseudo-random three-frequency signal transmitter and pseudorandom two pass three earth electric field signals collecting receiver frequently.
Described pseudo-random three-frequency signal transmitter comprises Single Chip Microcomputer (SCM) system, driver, inverter, DC high-voltage power supply, sample resistance, current foldback circuit, current measurement circuit, synchronizing circuit, frequency selective network; Preferred version also includes undervoltage detection circuit and sound warning circuit.The output terminal of described synchronizing circuit is connected to the interrupting input end of Single Chip Microcomputer (SCM) system, the output terminal of frequency selective network is connected to the I/O mouth of Single Chip Microcomputer (SCM) system, Single Chip Microcomputer (SCM) system is by I/O mouth Control Driver, driver is connected to inverter, DC high-voltage power supply is connected with inverter, and the output terminal of inverter is connected with binding post B with binding post A.Sample resistance is connected with inverter with DC high-voltage power supply; the output of sample resistance divides two-way; one the tunnel is connected with current foldback circuit; another road is connected with current measurement circuit; the output terminal of current foldback circuit is connected to driver by signal wire, and is connected to Single Chip Microcomputer (SCM) system by another signal wire.The output of circuit measuring circuit is connected to the I/O mouth of Single Chip Microcomputer (SCM) system.The output terminal of described undervoltage detection circuit also is connected to monolithic, the I/O mouth of machine system, and Single Chip Microcomputer (SCM) system is connected to the audible alarm circuit by the I/O mouth.
Described DC high-voltage power supply voltage can (contain two end points) between 20-1000V selects, preferred 200--600V.
Described pseudorandom two pass three earth electric field signals collecting receiver frequently is made up of parameter identical two three frequencies ripple signal extraction passage and Single Chip Microcomputer (SCM) system at least, each signal extraction passage is by electric-field sensor, shared pathway, low channel, intermediate-frequency channel, hf channel, A/D change-over circuit and timing are formed with control logic circuit, the output terminal of described electric-field sensor is connected to the input end of shared pathway, the output terminal of shared pathway is connected respectively to low channel, the input end of intermediate-frequency channel and hf channel, low channel, the output terminal of intermediate-frequency channel and hf channel is connected respectively to the input end of A/D change-over circuit, the output terminal of A/D change-over circuit is connected to Single Chip Microcomputer (SCM) system by the I/O interface line, and Single Chip Microcomputer (SCM) system is connected to regularly and control logic circuit by the I/O interface line.
The following stated is a kind of more specifically structure of signal extraction passage.
The output terminal of electric-field sensor is connected to the input end of high-pass filtering circuit, the output terminal of high-pass filtering circuit is connected to the input end of pre-amplification circuit, the output terminal of pre-amplification circuit is connected to the input end of low-pass filter circuit, the input end of middle rank amplifying circuit is connected to the output terminal of low-pass filter circuit, and the output terminal of intermediate amplifying circuit is connected respectively to the input end of low frequency bandwidth-limited circuit, intermediate frequency bandwidth-limited circuit, high-frequency band pass filtering circuit by signal wire; The output terminal of low frequency bandwidth-limited circuit is connected to the input end of low-frequency amplifier, and the output terminal of low-frequency amplifier is connected to the input end of low frequency detection and integrating circuit, and low frequency detection and integrating circuit output terminal are connected to the input end of integration type A/D change-over circuit; The output terminal of intermediate frequency bandwidth-limited circuit is connected to the input end of intermediate frequency amplifier, and the output terminal of intermediate frequency amplifier is connected to the input end of intermediate frequency detection and integrating circuit, and intermediate frequency detection and integrating circuit output terminal are connected to the input end of integration type A/D change-over circuit; The output terminal of high-frequency band pass filtering circuit is connected to the input end of radio-frequency amplifier, and the output terminal of radio-frequency amplifier is connected to the input end of high frequency detection and integrating circuit, and high frequency detection and integrating circuit output terminal are connected to the input end of integration type A/D change-over circuit; The output terminal of integration type A/D change-over circuit is connected to the input end of Single Chip Microcomputer (SCM) system, and Single Chip Microcomputer (SCM) system 40 is connected to regularly and control logic circuit by the I/O interface line.
Shared pathway is composed in series successively by high-pass filtering circuit, pre-amplification circuit, low-pass filter circuit, intermediate amplifying circuit.
Described signal extraction passage is generally two, also can be three or more.
The above various circuit all can be selected for use from relevant known circuits.
Measure appropriate to the occasion employing current waveform as shown in Figure 1 and infeed underground electric current by Fig. 1 (a) or the wave form varies (b) as measuring current waveform, making, on mathematics, the waveform shown in Fig. 1 (a) can be written as:
I
0 -T/2＜t＜-T/8
I(t)＝-I
0 -T/8＜t＜0 (1)
I
0 0＜t＜T/8
-I
0 T/8＜t＜T/2
And the waveform of Fig. 1 (b) can be written as:
I
0 -T/2＜t＜-11T/32
-I
0 -11T/32＜t＜-10T/32
I
0 -10T/32＜t＜-9T/32
-I
0 -9T/32＜t＜-8T/32
I
0 -8T/32＜t＜-3T/32
-I
0 -3T/32＜t＜-2T/32
I
0 -2T/32＜t＜-T/32
I(t)＝-I
0 -T/32＜t＜0 (2)
I
0 0＜t＜T/32
-I
0 T/32＜t＜2T/32
I
0 2T/32＜t＜3T/32
-I
0 3T/32＜t＜8T/32
I
0 8T/32＜t＜9T/32
-I
0 9T/32＜t＜10T/32
I
0 10T/32＜t＜11T/32
-I
0 11T/32＜t＜T/2
The electric current of formula (1) expression, three predominant frequencies are respectively f, 2f and 4f, three's amplitude is respectively 0.9003I
0, 0.6366I
0And 0.6366I
0, the share that the three occupies in gross energy is respectively 40.53%, 20.26% and 20.26%, three's energy sum has accounted for and has infeeded more than 80% of underground gross energy.
The electric current of formula (2) expression, three predominant frequencies are respectively f, 4f and 16f, three's amplitude is respectively 0.6626I
0, 0.6366I
oAnd 0.6366I
0, the share that the three occupies in gross energy is respectively 21.95%, 20.26% and 20.26%, three's energy sum has accounted for and has infeeded more than 60% of underground gross energy.
Can also design other multiple frequency intervals and/or energy distribution and formula (1), (2) different pseudo-random three-frequency electric current.But through experiment screening, be fit to reconnoitre geophysical needs more with the pseudo-random three-frequency electric current of above-mentioned two kinds of forms.
The principle that pseudo-random three-frequency amplitude and relative phase are measured is as follows:
In frequency domain electromagnetic methods, investigation depth has following relation with the frequency that infeeds underground electric current:
D＝356ρ/f (3)
(3) in the formula, D is an investigation depth, and ρ is the resistivity that is detected material, and f is the frequency that infeeds underground electric current.(3) formula shows, the frequency of sending into underground electric current is low more, and investigation depth is big more.As shown in Figure 1 the artificial electric current that contains three predominant frequencies is infeeded underground, just can once obtain the ground electroresponse information of three degree of depth.
In the frequency field induced polarization method, the underground geologic objective that whether has mineral metal products one class, one side is reflected as the difference of the amplitude of earth electric field potential difference (PD) response, and this species diversity can be weighed with the parameter that is called the amplitude-frequency rate of following formula definition:
F
s＝(|ΔV
D|-|ΔV
G|)/|ΔV
G| (4)
(4) in the formula, F
s-amplitude-frequency rate, Δ V
D-LF-response potential difference (PD), Δ V
G-high frequency response potential difference (PD).
On the other hand, also be reflected as the relative phase difference that high, medium and low frequency response is answered:
Δ
D-z＝
D-
z Δ
z-G＝
z-
G (5)
(5) in the formula,
DThe phase place of-low frequency potential difference (PD) response,
zThe phase place of-intermediate frequency potential difference (PD) response,
GThe phase place of-high-frequency electrical potential difference response, Δ
D-zThe response of-low frequency potential difference (PD) is with respect to the phase differential of intermediate frequency potential difference (PD) response, Δ
Z-GThe response of-intermediate frequency potential difference (PD) is with respect to the relative phase difference of high-frequency electrical potential difference response.According to known experimental result, this relative phase difference can provide the ore deposit or the information in non-ore deposit differentiated.
The present invention's measurement mechanism and method both can be carried out the measurement that frequency field is looked complex resistivity, can carry out frequency field again and excite the measurement that intensifies, it measures the electric current presentation mode can once provide the electric current that contains three predominant frequency compositions simultaneously, the energy that these three predominant frequency compositions contain equates that substantially three's sum has accounted for the major part of total power supply energy; This metering system can be measured the information of the ground electroresponse of three predominant frequencies simultaneously, comprises amplitude and relative phase, especially can obtain from the relative phase data of three frequencies to differentiate ore deposit and/or non-ore deposit, finds out the important information of buried target volume property.
Because each passage of measurement mechanism of the present invention can both be measured the earth electric field response of three frequencies simultaneously, thereby accomplish once to obtain the information combination of 3 frequency earth electric field responses, comprise and look complex resistivity, look amplitude-frequency rate and relative phase, improve the work efficiency of resistivity prospecting greatly, overcome the shortcoming of the inefficiency of artificial source's resistivity prospecting in the past.
The present invention has also overcome existing resistivity prospecting need change frequency, perhaps energy distribution imbalance, and other odd harmonic signal intensities are too small except a predominant frequency, the defective that is difficult to observe.
Utilize the present invention to carry out the pseudo-random three-frequency resistivity prospecting,, improved the efficient of frequency field resistivity prospecting greatly owing to can obtain two passages or the ground electricity data of three frequencies of hyperchannel more simultaneously, shorten the time of physical prospecting field work, reduce labour intensity, save the energy, reduce cost.The particularly important is, obtain the relative phase data of three frequencies of several passages simultaneously, the induced polarization anomaly of finding the sulfuration mineral products, reason and the definite unusual character that resolution causes unusually, the valuable data that provides existing electrical resistivity survey method to provide are provided.
Description of drawings
Fig. 1 is the pseudo-random three-frequency current waveform figure of the embodiment of the invention;
Fig. 2 is that the pseudo-random three-frequency signal transmitter of the embodiment of the invention constitutes block scheme;
Fig. 3 is that pseudorandom two pass three frequency earth electric field signal receivers embodiment illustrated in fig. 2 constitute block scheme;
Fig. 4 is passage 1 three a shown in Figure 3 earth electric field signals collecting reception frequently schematic block diagram;
The F of Fig. 5 pyrite and graphite sample
s-ln (w) curve;
The theoretical analysis that Fig. 6 pseudo-random three-frequency relative phase is measured;
Fig. 7 pseudo-random three-frequency relative phase is measured the experimental result of distinguishing sulphide ore and graphite.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
With reference to Fig. 2-4, the earth electric field pseudo-random three-frequency ground electroresponse measurement mechanism of present embodiment comprises pseudo-random three-frequency signal transmitter and pseudorandom two pass three earth electric field signals collecting receiver frequently.
The structure of described pseudo-random three-frequency signal transmitter is made up of 80C32 Single Chip Microcomputer (SCM) system 54, driver 56, inverter 66, direct current DC high-voltage power supply 74, sample resistance 68, current foldback circuit 62, current measurement circuit 64, synchronizing circuit 50, frequency selective network 52, undervoltage detection circuit 58 and sound warning circuit 60 as shown in Figure 2.
The output terminal of synchronizing circuit 50 is connected to the interrupting input end of 80C32 Single Chip Microcomputer (SCM) system 54, the output terminal of frequency selective network 52 is connected to the I/O mouth of 80C32 Single Chip Microcomputer (SCM) system 54,80C32 Single Chip Microcomputer (SCM) system 54 is by I/O mouth Control Driver 56, driver 56 is connected to inverter 66, DC high-voltage power supply 74 is connected with inverter 66, and the output terminal of inverter 66 is connected with binding post B 72 with binding post A 70.Sample resistance 68 is connected with inverter 66 with DC high-voltage power supply 74; the output terminal of sample resistance 68 divides two-way; one the tunnel is connected with current foldback circuit 62; another road is connected with current measurement circuit 64; the output terminal of current foldback circuit 62 is connected to driver 56 by signal wire 621, is connected to 80C32 Single Chip Microcomputer (SCM) system 54 by signal wire 6222.The output terminal of circuit measuring circuit 64 is connected to the I/O mouth of 80C32 Single Chip Microcomputer (SCM) system.The output terminal of undervoltage detection circuit 58 is connected to the I/O mouth of 80C32 Single Chip Microcomputer (SCM) system 54.80C32 Single Chip Microcomputer (SCM) system 54 is connected to audible alarm circuit 60 by the I/O mouth.
80C32 Single Chip Microcomputer (SCM) system 54 is according to the input end of synchronizing circuit 50 and frequency selective network 52, produce the pseudo-random three-frequency ripple signal of certain frequency and phase place, three frequency signals are by 66 work of driver 56 control inverters, inverter is transformed into three frequency ripple signals with DC high-voltage power supply 74, infeeds the earth by binding post A 70 and binding post B 72.
The supply current signal produces by sample resistance 68, and 64 pairs of supply currents of current measurement circuit amplify and A/D conversion back input end 80C32 Single Chip Microcomputer (SCM) system 54, show the supply current size by 80C32 Single Chip Microcomputer (SCM) system 54.Simultaneously; the supply current signal that sample resistance 68 produces is sent into current foldback circuit 62; the output terminal of current foldback circuit 62 is connected to driver 56 by signal wire 621; if supply current surpasses the transmitter permissible value; current foldback circuit 62 sends locking signal to driver; allow driver 66 quit work; simultaneously by signal wire 622 notice Single Chip Microcomputer (SCM) system 54; after Single Chip Microcomputer (SCM) system 54 is received over-current signal; stop the three transmission work of ripple frequently, send alerting signal by audible alarm circuit 60 simultaneously.
The various supply voltages of undervoltage detection circuit 58 monitoring transmission machines, when voltage source was lower than setting value, undervoltage detection circuit 58 sent alerting signal to 80C32 Single Chip Microcomputer (SCM) system 54.80C32 Single Chip Microcomputer (SCM) system 54 is received the warning of sounding after the alerting signal, and prompting user shutdown stops the three transmission work of ripples frequently.
Described pseudorandom two pass three earth electric field signals collecting receiver frequently constitutes as shown in Figure 3, form by identical two three frequency ripple signal extraction passages (passage 1 and passage 2) of parameter and 80C32 Single Chip Microcomputer (SCM) system 40, passage 1 is by electric-field sensor 10, shared pathway 12, low channel 14, intermediate-frequency channel 16, hf channel 18, A/D change-over circuit 20 and timing are formed with control logic circuit 22, the output terminal of electric-field sensor 10 is connected to the input end of shared pathway 12, the output terminal of shared pathway 12 is connected respectively to low channel 14, the input end of intermediate-frequency channel 16 and hf channel 18, low channel 14, the output terminal of intermediate-frequency channel 16 and hf channel 18 is connected respectively to the input end of A/D change-over circuit 20, the output terminal of A/D change-over circuit 20 is connected to Single Chip Microcomputer (SCM) system 40 by I/O interface line 201, and Single Chip Microcomputer (SCM) system 40 is connected to timing and control logic circuit 22 by the I/O interface line.Passage 2 is made up of with control logic circuit 32 electric-field sensor 24, shared pathway 26, low channel 28, intermediate-frequency channel 30, hf channel 32, A/D change-over circuit 34 and timing, and is identical with passage 1 on parameter and structure.The measurement result of passage 1 is delivered to 80C32 Single Chip Microcomputer (SCM) system 40 by data line 201, and the measurement result of passage 2 is delivered to 80C32 Single Chip Microcomputer (SCM) system 40 by data line 202.
Because the principle of work of two passages is identical, now only make an explanation with regard to the principle of work of passage 1.Electric-field sensor 10 converts three frequency rolling land electric field signals to need three frequency potential difference signals, and this signal divides three the tunnel to enter low channel 14, intermediate-frequency channel 16, hf channel 18 respectively after shared pathway 12 amplifications and filtering.Low channel 14 separates the low frequency signal in the three frequency ripples and extracts, intermediate-frequency channel 16 separates the intermediate-freuqncy signal in the three frequency ripples and extracts, hf channel 18 separates the intermediate-freuqncy signal in the three frequency ripples and extracts, regularly with the control of control logic circuit 22 under, the output terminal of low channel 14, intermediate-frequency channel 16 and hf channel 18 enters A/D change-over circuit 20 successively, the output terminal of A/D change-over circuit 20 enters Single Chip Microcomputer (SCM) system 40 by data line 201, is calculated and the demonstration measurement result by Single Chip Microcomputer (SCM) system 40.
Fig. 4 is the passage shown in Figure 31 three more detailed synoptic diagram of rolling land electric field signal collecting part structures frequently.
The output terminal of electric-field sensor 10 is connected to the input end of high-pass filtering circuit 121, the output terminal of high-pass filtering circuit 121 is connected to the input end of pre-amplification circuit 122, the output terminal of pre-amplification circuit 122 is connected to the input end of low-pass filter circuit 123, the input end of middle rank amplifying circuit 124 is connected to the output terminal of low-pass filter circuit 123, and the output terminal of intermediate amplifying circuit 124 is by signal wire 1241, signal wire 1242, signal wire 1243 is connected respectively to low frequency bandwidth-limited circuit 143, intermediate frequency bandwidth-limited circuit 163, the input end of high-frequency band pass filtering circuit 183; The output terminal of low frequency bandwidth-limited circuit 143 is connected to the input end of low-frequency amplifier 142, the output terminal of low-frequency amplifier 142 is connected to the input end of low frequency detection and integrating circuit 141, and low frequency detection and integrating circuit 141 are connected to the input end of integration type A/D change-over circuit 20; The output terminal of intermediate frequency bandwidth-limited circuit 163 is connected to the input end of intermediate frequency amplifier 162, the output terminal of intermediate frequency amplifier 162 is connected to the input end of intermediate frequency detection and integrating circuit 161, and intermediate frequency detection and integrating circuit 161 are connected to the input end of integration type A/D change-over circuit 20; The output terminal of high-frequency band pass filtering circuit 183 is connected to the input end of radio-frequency amplifier 182, the output terminal of radio-frequency amplifier 182 is connected to the input end of high frequency detection and integrating circuit 181, and high frequency detection and integrating circuit 181 output terminals are connected to the input end of integration type A/D change-over circuit 20; The output terminal of integration type A/D change-over circuit 20 is connected to the input end of Single Chip Microcomputer (SCM) system 40, and Single Chip Microcomputer (SCM) system 40 is connected to timing and control logic circuit 22 by the I/O interface line.
Shared pathway 12 is composed in series successively by high-frequency filter circuit 121, pre-amplification circuit 122, low-pass filter circuit 123, intermediate amplifying circuit 124.
The output terminal of electric-field sensor 10 is connected to high-pass filtering circuit 121, high-pass filtering circuit 121 has been suppressed direct current and the low-frequency disturbance in the three frequency rolling land electric field signals, after 122 pairs of signals of pre-amplification circuit amplify, enter low-pass filter circuit 123, high frequency interference in this circuit throttle signal, after the high frequency interference compacting in the signal, 124 pairs three frequencies of intermediate amplifying circuit rolling land electric field signal further amplifies.The output terminal of middle rank amplifier 124 is connected respectively to low frequency bandwidth-limited circuit 143, intermediate frequency bandwidth-limited circuit 163 and high-frequency band pass filtering circuit 183 by signal wire 1241, signal wire 1242 and signal wire 1243.Therefore the effect of shared pathway 12 be to three frequently in the electric field signals of rolling land the signal of all three frequencies carry out filtering and amplification, low frequency in the throttle signal and high frequency interference, make three frequently the ripple signals effectively amplified.
Low channel 14, intermediate-frequency channel 16 are identical with the circuit structure of hf channel 18, but the circuit parameter difference, their effect be with three frequently low frequency, intermediate frequency and the high-frequency signal in the ripple signals extract.The principle of work of low channel 14 now only is described.
Low frequency bandwidth-limited circuit 143 is separated the low frequency signal in the three frequency ripple signals, be amplified to the amplitude that needs by low-frequency amplifier 142, enter low frequency detection and integrating circuit 141 then, this circuit converts the low frequency signal in the three frequency ripples to direct current signal, the output terminal of 20 pairs of low frequency detections of integration type A/D change-over circuit and integrating circuit carries out the A/D conversion, and transformation result enters Single Chip Microcomputer (SCM) system 40.
Single Chip Microcomputer (SCM) system 40 is controlled by timing and amplifier, integration type A/D change-over circuit 20 in 22 pairs of shared pathway 12 of control logic circuit, low channel 14, intermediate-frequency channel 16 and the hf channel 18, and measuring process is undertaken by designing requirement.
DC high-voltage power supply 74 voltages are 500V.
The measurement of using the present invention's the genuine electroresponse measurement mechanism of pseudo-random three-frequency bilateral to carry out the amplitude of ground electroresponse and relative phase can obtain two passages of three frequencies in the condition that does not change frequency next time and comprise apparent resistivity, looks amplitude-frequency rate, relative phase six groups totally 18 parameters, improve the work efficiency of resistivity prospecting greatly, save the working time, reduce labor intensity, energy savings reduces cost.In frequency domain electromagnetic methods, can once obtain the apparent resistivity of three degree of depth.And in the frequency field induced polarization method, what can once obtain three frequencies looks amplitude-frequency rate and relative phase.
Adopting great advantage of the present invention is that the valuable data of distinguishing ore deposit and/or non-ore deposit can be provided.Illustrate below.
Fig. 5 is the F of pyrite and graphite
s-ln (w) curve, two curves have similar feature, only according to F
s-ln (w) curve is difficult to distinguish the character of the two.But pyrite has different sharp electric phase characteristiies separately with graphite, as Fig. 6.The peak value of pyritous j-lnf curve is in higher frequency, and the frequency that the peak value of the j-lnf curve of graphite occurs is much lower.Therefore the relativeness of three frequency plots is j for pyrite
G＞j
Z＞j
D, the relativeness of three frequency plots of graphite is j
D＞j
Z＞j
GTheir different frequency characteristics make can distinguish them with the measurement of pseudo-random three-frequency relative phase.Accompanying drawing 7 is to measure the experimental result of distinguishing sulphide ore and graphite with the pseudo-random three-frequency relative phase, experimental result (accompanying drawing 7 (b)) on experimental result on the pyrrhotite (accompanying drawing 7 (a)) and graphite has aforesaid relative phase feature respectively, and the relative phase feature of the two is still very clear when pyrite and graphite coexistence, can distinguish well each other.
Claims (5)
1, a kind of earth electric field pseudo-random three-frequency ground electroresponse measurement mechanism, it is characterized in that, it is made of pseudo-random three-frequency signal transmitter and pseudorandom two pass three frequency earth electric field signals collecting receivers, described pseudo-random three-frequency signal transmitter comprises Single Chip Microcomputer (SCM) system, driver, inverter, DC high-voltage power supply, sample resistance, current foldback circuit, current measurement circuit, synchronizing circuit, frequency selective network, the output terminal of described synchronizing circuit is connected to the interrupting input end of Single Chip Microcomputer (SCM) system, the output terminal of frequency selective network is connected to the I/O mouth of Single Chip Microcomputer (SCM) system, Single Chip Microcomputer (SCM) system is by I/O mouth Control Driver, driver is connected to inverter, DC high-voltage power supply is connected with inverter, the output terminal of inverter is connected with binding post B with binding post A, sample resistance is connected with inverter with DC high-voltage power supply, the output of sample resistance divides two-way, one the tunnel is connected with current foldback circuit, another road is connected with current measurement circuit, the output terminal of current foldback circuit is connected to driver by signal wire, and being connected to Single Chip Microcomputer (SCM) system by another signal wire, the output terminal of circuit measuring circuit is connected to the I/O mouth of Single Chip Microcomputer (SCM) system; Described pseudorandom two pass three earth electric field signals collecting receiver frequently is made up of parameter identical two three frequencies ripple signal extraction passage and Single Chip Microcomputer (SCM) system at least, each signal extraction passage is by electric-field sensor, shared pathway, low channel, intermediate-frequency channel, hf channel, A/D change-over circuit and timing are formed with control logic circuit, the output terminal of described electric-field sensor is connected to the input end of shared pathway, the output terminal of shared pathway is connected respectively to low channel, the input end of intermediate-frequency channel and hf channel, low channel, the output terminal of intermediate-frequency channel and hf channel is connected respectively to the input end of A/D change-over circuit, the output terminal of A/D change-over circuit is connected to Single Chip Microcomputer (SCM) system by the I/O interface line, and Single Chip Microcomputer (SCM) system is connected to regularly and control logic circuit by the I/O interface line; Described DC high-voltage power supply voltage is 20-1000V.
2, earth electric field pseudo-random three-frequency ground electroresponse measurement mechanism according to claim 1, it is characterized in that, described pseudo-random three-frequency signal transmitter also includes undervoltage detection circuit and sound warning circuit, the output terminal of described undervoltage detection circuit is connected to the I/O mouth of Single Chip Microcomputer (SCM) system, and Single Chip Microcomputer (SCM) system is connected to the audible alarm circuit by the I/O mouth.
3, earth electric field pseudo-random three-frequency ground electroresponse measurement mechanism according to claim 1 and 2, it is characterized in that, the output terminal of the electric-field sensor of described three frequency ripple signal extraction passages is connected to the input end of high-pass filtering circuit, the output terminal of high-pass filtering circuit is connected to the input end of pre-amplification circuit, the output terminal of pre-amplification circuit is connected to the input end of low-pass filter circuit, the input end of middle rank amplifying circuit is connected to the output terminal of low-pass filter circuit, and the output terminal of intermediate amplifying circuit is connected respectively to the low frequency bandwidth-limited circuit by signal wire, the intermediate frequency bandwidth-limited circuit, the input end of high-frequency band pass filtering circuit; The output terminal of low frequency bandwidth-limited circuit is connected to the input end of low-frequency amplifier, and the output terminal of low-frequency amplifier is connected to the input end of low frequency detection and integrating circuit, and low frequency detection and integrating circuit output terminal are connected to the input end of integration type A/D change-over circuit; The output terminal of intermediate frequency bandwidth-limited circuit is connected to the input end of intermediate frequency amplifier, and the output terminal of intermediate frequency amplifier is connected to the input end of intermediate frequency detection and integrating circuit, and intermediate frequency detection and integrating circuit output terminal are connected to the input end of integration type A/D change-over circuit; The output terminal of high-frequency band pass filtering circuit is connected to the input end of radio-frequency amplifier, and the output terminal of radio-frequency amplifier is connected to the input end of high frequency detection and integrating circuit, and high frequency detection and integrating circuit output terminal are connected to the input end of integration type A/D change-over circuit; The output terminal of integration type A/D change-over circuit is connected to the input end of Single Chip Microcomputer (SCM) system, and Single Chip Microcomputer (SCM) system is connected to regularly and control logic circuit by the I/O interface line; Described shared pathway is composed in series successively by high-frequency filter circuit, pre-amplification circuit, low-pass filter circuit, intermediate amplifying circuit.
4, earth electric field pseudo-random three-frequency ground electroresponse measurement mechanism according to claim 1 and 2 is characterized in that described DC high-voltage power supply voltage is 200-600V.
5, earth electric field pseudo-random three-frequency ground electroresponse measurement mechanism according to claim 3 is characterized in that described DC high-voltage power supply voltage is 200-600V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510031324 CN1292265C (en) | 2005-03-11 | 2005-03-11 | Pseudo-random three frequency geoelectric response measuring device and method for geoelectric field |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510031324 CN1292265C (en) | 2005-03-11 | 2005-03-11 | Pseudo-random three frequency geoelectric response measuring device and method for geoelectric field |
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| Publication Number | Publication Date |
|---|---|
| CN1683941A CN1683941A (en) | 2005-10-19 |
| CN1292265C true CN1292265C (en) | 2006-12-27 |
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| CN102053278A (en) * | 2010-09-09 | 2011-05-11 | 天津英驰勘探技术有限公司 | Electrical prospecting method and measuring device |
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| CN100483152C (en) * | 2006-09-01 | 2009-04-29 | 中南大学 | Multifunctional sender and controller for electrical surveying signal |
| CN102253416B (en) * | 2011-05-06 | 2016-08-03 | 中国地质大学（北京） | Multifunctional high-power multiple tracks rolls quickly measures electrical method earthquake Integrated Measurement System |
| CN102520449B (en) * | 2011-12-21 | 2013-08-07 | 吉林大学 | Receiver device of high density electric method device |
| CN103023581B (en) * | 2012-12-14 | 2015-01-07 | 陈曦鸣 | Grounding two-way digital information communication device utilizing ground electric field detection technology |
| CN117518275A (en) * | 2023-10-23 | 2024-02-06 | 南方海洋科学与工程广东省实验室(湛江) | Ocean electromagnetic emission system, control method, device and medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102053278A (en) * | 2010-09-09 | 2011-05-11 | 天津英驰勘探技术有限公司 | Electrical prospecting method and measuring device |
| CN102053278B (en) * | 2010-09-09 | 2011-10-26 | 天津英驰勘探技术有限公司 | Electrical prospecting method and measuring device |
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