CN103775833A - Pipeline leakage monitoring system and method - Google Patents
Pipeline leakage monitoring system and method Download PDFInfo
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Abstract
The invention discloses a pipeline leakage monitoring system which comprises a front end sensor subsystem and a leakage monitoring signal conditioning subsystem with a current loop receiving module, a signal restore module, a second lower-frequency amplification module and a second lowpass filter module. The front end sensor subsystem is used for amplifying and filtering dynamic pressure signals generated due to dynamic pressure changes at the leakage moment of a pipeline and then converting the dynamic pressure signals into current signals, the current signals are transmitted to the leakage monitoring signal conditioning subsystem, the leakage monitoring signal conditioning subsystem converts the received current signals into dynamic pressure signals, and then amplifies and filters the dynamic pressure signals, and then the dynamic pressure data of the pipeline leakage are recorded. The invention further discloses a pipeline leakage monitoring method. According to the pipeline leakage monitoring system and method, a sensing system is high in sensitivity, capable of responding to tiny signals, high in signal to noise ratio, compact in structure, long in service life, safe and reliable, and cannot be interfered by electromagnetism easily.
Description
Technical field
The present invention relates to pipeline monitoring technical field, particularly a kind of line leakage system and method.
Background technique
Oil transport pipeline is made up of pipeline, equipment and annex, and according to the needs of technological process, is equipped with corresponding oil pump unit, and design and installation becomes a complete pipe-line system, and in order to complete, oil plant is unloaded and conveying task.
Previous line leakage technology comprises that the difference in flow of application traffic balancing method monitoring pipe head and outlet end judges leakage; Judge whether to leak by gather pressure data at oil pump station setting pressure transmitter; Judge whether to leak by the inflammable gas leaking at pipeline on the way installing gas Sensor monitoring in soil aperture.
Flow equilibrium method can be monitored out less leakage, but slower for reacting of leaking, and need to flowmeter be installed at the two ends of every segment pipe, only relies on data on flows not position leakage point simultaneously.
The principle of pressure transmitter monitoring leakage is, the pressure absolute value that pressure transducer is collected is converted to 4-20mA electric current loop and exports, pressure absolute value, according to the current signal that is converted to 4-20mA of pressure range ability equal proportion, is converted to voltage signal by current signal again at receiving terminal and receives.When pipeline is subject to temperature and environmetal impact that pressure is changed under normal circumstances, the pressure signal that pressure transmitter collects only accounts for very little ratio in Full-span output value, so cannot measure accurately for the less pressure variety of output value.
Gas sensitization method can be located leak position and monitoring minute leakage, but need to lay along pipeline high density, and cost is high, is difficult for realizing.
Summary of the invention
Technical problem to be solved by this invention is to provide the line leakage system and method based on dynamic pressure transducer that a kind of validity is high.
For solving the problems of the technologies described above, one aspect of the present invention, a kind of line leakage system is provided, comprise: front end sensors subtense angle, is provided with the leakage monitoring signal condition subtense angle of electric current loop receiving module, signal recovery module, the second low-frequency amplification module and the second low-pass filtering module;
For pipeline was changed because of dynamic pressure in leakage moment, the dynamic pressure signal producing amplifies described front end sensors subtense angle, filtering is transformed to current signal after processing, more described current signal is sent to described testing signal conditioning subtense angle;
Described electric current loop receiving module receives for the current signal that front end sensing subsystem is sent;
Described signal recovery module is reduced to dynamic pressure signal for the current signal that electric current loop receiving module is received;
Described the second low-frequency amplification module is used for described dynamic pressure signal to amplify, and adjusts the measurement range of described line leakage system according to dynamic pressure variable quantity;
Described the second low-pass filtering module, for the dynamic pressure signal after amplifying is carried out after filtering processing higher than the high-frequency signal filtering of monitoring objective frequency, carries out record to the dynamic pressure signal data of pipe leakage.
Further, described front end sensors subtense angle comprises:
Dynamic pressure transducer, the first low-frequency amplification module, the first low-pass filtering module and electric current loop transmitter module;
Dynamic pressure transducer, changes the dynamic pressure signal that produce because of dynamic pressure for gathering pipeline leaking moment;
Described the first low-frequency amplification module amplifies for the dynamic pressure signal that described dynamic pressure transducer is collected;
Described the first low-pass filtering module carries out filtering processing for the high-frequency signal that the dynamic pressure signal after amplifying is exceeded to target detection frequency;
Described electric current loop transmitter module is used for dynamic pressure signal after treatment after filtering and is converted to current signal and is sent to described leakage monitoring signal condition subtense angle.
Further, described dynamic pressure transducer is the dynamic pressure transducer with particular job frequency, and it gathers pipe leakage dynamic pressure signal and responds in particular frequency range.
Further, described dynamic pressure transducer is according to the frequency range 4Hz-10KHz of pipe leakage dynamic pressure, and the measuring frequency scope of setting front end sensing subsystem is <30KHz.
Further, described leakage monitoring signal condition subtense angle also comprises:
Described temperature detecting module, for gathering the temperature value of Leak testtion signal condition subtense angle environment of living in, provides foundation for adjusting analogue signal gain;
The temperature information of described control unit for collecting by temperature detecting module, adjusts analogue signal gain in real time, makes system in the situation that ambient temperature changes, and measures range and remains unchanged.
Another aspect of the present invention, provides a kind of line leakage method, comprising:
Described current signal is received, and the current signal receiving is reduced to dynamic pressure signal;
Described dynamic pressure signal is amplified, and adjust the measurement range of described line leakage system according to dynamic pressure variable quantity;
By filtering after processing higher than the high-frequency signal of monitoring objective frequency in the dynamic pressure signal after amplifying, the dynamic pressure signal data of pipe leakage are carried out to record.
Further, described dynamic pressure signal is gathered, more described dynamic pressure signal is amplified, after filtering processes, described dynamic pressure signal is converted into current signal output and comprises:
Pipeline was gathered because dynamic pressure changes the dynamic pressure signal producing in leakage moment;
The described dynamic pressure transducer dynamic pressure signal collecting is amplified;
The high-frequency signal that exceedes target detection frequency in described dynamic pressure signal after amplifying is carried out to filtering processing;
Dynamic pressure signal after treatment is converted to current signal output after filtering.
Further, according to the frequency range 4Hz-10KHz of pipe leakage dynamic pressure, the dynamic pressure signal frequency range of collection is controlled to <30KHz.
Further, described line leakage system, also comprises:
When dynamic pressure signal is gathered, temperature data is gathered, provide foundation for adjusting analogue signal gain; Then according to the temperature information collecting, adjust in real time analogue signal gain, make system in the situation that ambient temperature changes, measure range and remain unchanged.
Line leakage system and method provided by the invention, front end sensors subtense angle is highly sensitive, to tiny signal also can produce reaction, signal to noise ratio high, be not subject to electromagnetic interference, compact structure, long service life, safe and reliable, in addition, adopt electric current loop form to carry signal, conveniently realize long Distance Transmission and the processing of signal, can accurately react the state of changing of dynamic pressure in tested pipeline, monitoring accuracy is high, reaction velocity is fast, reliable and stable.
Accompanying drawing explanation
Fig. 1 is the line leakage system principle diagram based on dynamic pressure transducer
Fig. 2 is that sound wave sensor, the low frequency of front end sensing subsystem amplifies, electric current loop sends schematic diagram
Fig. 3 is the lowpass filtering theory figure of front end sensing subsystem
Fig. 4 is leakage monitoring signal condition subtense angle electric current loop record principle figure
Fig. 5 is leakage monitoring signal condition subsystem signals reduction principle figure
Fig. 6 is leakage monitoring signal condition subtense angle lowpass filtering theory figure
Fig. 7 is leakage monitoring signal condition subtense angle low-frequency amplifier circuit figure
Fig. 8 is leakage monitoring signal condition subsystem controls unit, temperature collect module circuit diagram
Fig. 9 is the workflow diagram of the line leakage system based on dynamic pressure transducer
Embodiment
Referring to Fig. 1, a kind of line leakage system that the embodiment of the present invention provides, comprises front end sensors subtense angle and leakage monitoring signal condition subtense angle; For pipeline was changed because of dynamic pressure in leakage moment, the dynamic pressure signal producing amplifies described front end sensors subtense angle, filtering is transformed to current signal after processing, more described current signal is sent to described testing signal conditioning subtense angle; Described leakage monitoring signal condition subtense angle is converted to dynamic pressure signal for will receive described current signal, then by described dynamic pressure signal amplify, filtering processes laggard row data capture.
Wherein, described front end sensors subtense angle comprises: dynamic pressure transducer, the first low-frequency amplification module, the first low-pass filtering module and electric current loop transmitter module.Dynamic pressure transducer, changes the dynamic pressure signal that produce because of dynamic pressure for gathering pipeline leaking moment; Described dynamic pressure transducer is the dynamic pressure transducer with particular job frequency, and it gathers pipe leakage dynamic pressure signal and responds in particular frequency range.Dynamic pressure transducer have can be in Microsecond grade the superior function of response and high response frequency.These characteristics have been given sensor and can under high static background pressure condition, monitor the unique ability of low dynamic pressure, and it can bear high static pressure loading, also can respond to very little pressure surge accurately simultaneously.Described dynamic pressure transducer is according to the frequency range 4Hz-10KHz of pipe leakage dynamic pressure, and the measuring frequency scope of setting front end sensing subsystem is <30KHz; By the data analysis that a large amount of leakage signals are carried out, concentrate within the scope of <30KHz in the pressure wave signal frequency range of leaking moment generation.Front end sensors under prior art, maybe can not adjust measuring frequency scope, or leakage signal scope exceeds measuring frequency scope, and precision of measurement can not be guaranteed.The present invention is by adjusting the measuring frequency scope of front end sensing subsystem, the frequency range that can accurately cover leakage signal can guarantee leakage signal do not omit, easy to identify.
Described the first low-frequency amplification module amplifies for the dynamic pressure signal that described dynamic pressure transducer is collected; Described the first low-pass filtering module carries out filtering processing for the high-frequency signal that the dynamic pressure signal after amplifying is exceeded to target detection frequency; Described electric current loop transmitter module is used for dynamic pressure signal after treatment after filtering and is converted to current signal and is sent to described leakage monitoring signal condition subtense angle.
Described leakage monitoring signal condition subtense angle comprises: electric current loop receiving module, signal recovery module, the second low-frequency amplification module, the second low-pass filtering module, temperature detecting module and control unit.Described electric current loop receiving module receives for the current signal that front end sensing subsystem is sent; Described signal recovery module is reduced to dynamic pressure signal for the current signal that electric current loop receiving module is received; Described the second low-frequency amplification module is used for described dynamic pressure signal to amplify, and adjusts the measurement range of described line leakage system according to dynamic pressure variable quantity; Described the second low-pass filtering module is used for the dynamic pressure signal after amplifying, after the high-frequency signal filtering higher than monitoring objective frequency, the dynamic pressure signal data of pipe leakage being carried out to record.Described temperature detecting module, for gathering the temperature value of Leak testtion signal condition subtense angle environment of living in, provides foundation for adjusting analogue signal gain, and what embodiment of the present invention temperature detecting module adopted is temperature transducer.The temperature information of described control unit for collecting by temperature detecting module, adjusts analogue signal gain in real time, makes system in the situation that ambient temperature changes, and measures range and remains unchanged.Pipeline leakage testing equipment installation environment is conventionally more severe, and under extreme case, day and night temperature may reach tens degree to tens of degree.When temperature changes, simulate part components and parts generation temperature and waft, output waveform is changed, have a strong impact on the accuracy of later stage to data processing, existing rear end conditioning system cannot solve.In the present invention, adopt temperature transducer to ambient temperature real-time sampling, MCU control unit is adjusted simulation fractionated gain in real time by the temperature value collecting, the object of doing is like this: temperature variation causes that simulation part subelement generation temperature floats, MCU control unit is adjusted in real time gain and is carried out temperature correction, reduces the impact of environmental factor on waveform generation.In addition, temperature is not compensated, output voltage may exceed predefined value, and then impact even damages subordinate's device, carries out gain-adjusted and can avoid this situation to occur.
As shown in Figure 2, the electric principle that described dynamic pressure transducer, the first low-frequency amplification module and electric current loop receive is mainly made up of U4., 1 of socket J1, 2, 3, 4 end lines are connected, 2 end ground connection, 5 ends connect 12 and 13 ends of U4 through resistance R 1, between 5 ends and ground, connect capacitor C 2, and 5 connect the capacitor C 1 of connecting between end and ground, resistance R 2 and resistance R 10, between resistance R 2 and resistance R 10, connecting resistance R4 is to 4 ends of U4, 3 ends of U4 connect capacitor C 3 and are parallel to ground with the resistance R 13 of connecting and resistance R 14 through resistance R 9 Hou Yi roads, another road connects capacitor C 7 and is parallel to ground with the resistance R 16 of connecting and resistance R 17, connecting resistance R5 between 5 ends of U4 and 6 ends, U4's, between 1 end and 2 ends, meet potentiometer R8, the centre tap of potentiometer R8 connects 16 ends of U4, between 1 end of U4 and 16 ends, connect resistance R 6 and the resistance R 7 of series connection, between 2 ends of U4 and 16 ends, connect resistance R 11 and the resistance R 12 of series connection, the 7 end ground connection of U4, between 14 ends of U4 and 15 ends, connect capacitor C 4, between 10 ends of U4 and ground, connect capacitor C in parallel 5 and capacitor C 6,1 end of 10 ends of U4 combination hub J2 after diode D1 connects with resistance R 15, the 2 end ground connection of socket J2, meet diode D2 between 1 end of socket J2 and 2 ends.
As shown in Figure 3, the electric principle of described the first low-pass filtering module is mainly made up of operational amplifier U2; Input end is connect "+" input end of operational amplifier U2 after resistance R 101 by resistance R 103, after resistance R 101, connect "-" input end of operational amplifier U2 by capacitor C 101, between resistance R 101 and resistance R 103, through "+" input end of resistance R 102 and capacitor C 102 series connection operational amplifier U2, between resistance R 102 and capacitor C 102, connecting resistance R104 is to ground; 2 terminations-5V of operational amplifier U2,5 terminations+5V, the 1 end output of operational amplifier U2.
As shown in Figure 4, the electric principle of described electric current loop receiving module is mainly made up of operational amplifier U2A; "+" input end of operational amplifier U2A is through resistance R 1 ground connection, between "+" input end of operational amplifier U2A and "-" input end, connect photodiode U1B and the resistance R 3 of connecting, between photodiode U1B and resistance R 3, through resistance R 2 ground connection, output terminal 1 end of operational amplifier U2A connects "-" input end through capacitor C 1; The base stage of the output terminal 1 termination triode Q1 of operational amplifier U2A, between the collector electrode connecting resistance R3 and resistance R 2 of triode Q1, the emitter of triode Q1 connects "+" power supply through resistance R 4 and the light emitting diode U1A of series connection, meets capacitor C in parallel 2, reference diode Z1 between "+" power supply and resistance R 3, resistance R 2.
As shown in Figure 5, the electric principle of described signal recovery module is mainly made up of operational amplifier U3A; "+" input end grounding of operational amplifier U3A, "-" input end of operational amplifier U3A is through photodiode ground connection, and output terminal 1 end of operational amplifier U3A takes back "-" input end through capacitor C in parallel 4, resistance R 5.
As shown in Figure 6, the electric principle of described the second low-pass filtering module is mainly made up of operational amplifier U7; The input end of low-pass filter is through resistance R 10 ground connection, and connects "+" input end of operational amplifier U7 through resistance R 11, and "+" input end of operational amplifier U7 is through capacitor C 10 ground connection; The input end of low-pass filter connects "-" input end of operational amplifier U7 through capacitor C 8, output 1 termination "-" input end of operational amplifier U7; 5 terminations-15V of operational amplifier U7,7 terminations+15V.
As shown in Figure 7, the electric principle of the second low-frequency amplification module is mainly made up of operational amplifier U13; The input end that low frequency amplifies connects "-" input end of operational amplifier U13 through resistance R 6, "+" input end of operational amplifier U13 is through resistance R 8 ground connection, and the output terminal of operational amplifier U13 connects "-" input end of operational amplifier U13 through capacitor C in parallel 5, resistance R 7; 4 terminations-15V of operational amplifier U13,7 terminations+15V.
As shown in Figure 8, the electric principle of described temperature detecting module and control unit is mainly made up of U26, U11; U26 is PIC16F1820, and U11 is DS1267.The 1 termination VCC of U26,2 ends of U26 are OSC32OUT, 3 ends are OSC32IN, 4 ends are MCLR, and 8 ends are LED3V3, and 9 ends are LED+5V, 7 ends of 10 termination U11, the 11 termination RST of U26,10 ends of 12 termination U11,13 termination TEMP+5V, 14 termination TEMP3V3,9 ends of 15 termination U11, the 17 termination TEMP NTC of U26, the 18 termination IC SPCLK of U26, and meet VREF through resistance R 30, the 19 termination IC SPDAT of U26, the 20 end ground connection of U26; 1 end, 4 ends and the 8 end ground connection of U11,3 termination Pot H1,5 termination Pot W1,6 termination RST, 16 termination VCC+5V.
A kind of line leakage method provided by the invention, comprises the following steps:
Step S1: dynamic pressure signal is gathered, more described dynamic pressure signal is amplified, after filtering processes, described dynamic pressure signal is converted into current signal output;
Step S2: described current signal is received, and the current signal receiving is reduced to dynamic pressure signal;
Step S3: described dynamic pressure signal is amplified, and adjust the measurement range of described line leakage system according to dynamic pressure variable quantity;
Step S4: by filtering after processing higher than the high-frequency signal of monitoring objective frequency in the dynamic pressure signal after amplifying, the dynamic pressure signal data of pipe leakage are carried out to record;
Step S5: when dynamic pressure signal is gathered, temperature data is gathered, provide foundation for adjusting analogue signal gain, then according to the temperature information collecting, adjust in real time analogue signal gain, make system in the situation that ambient temperature changes, measure range and remain unchanged.
Wherein, dynamic pressure signal is gathered described in step S1, more described dynamic pressure signal is amplified, after filtering processes, described dynamic pressure signal is converted into current signal output and comprises:
Step S11: pipeline was gathered because dynamic pressure changes the dynamic pressure signal producing in leakage moment; According to the frequency range 4Hz-10KHz of pipe leakage dynamic pressure, the dynamic pressure signal frequency range of collection is controlled to <30KHz.
Step S12: the described dynamic pressure transducer dynamic pressure signal collecting is amplified;
Step S13: the high-frequency signal that exceedes target detection frequency in the described dynamic pressure signal after amplifying is carried out to filtering processing;
Step S14: dynamic pressure signal after treatment is converted to current signal output after filtering.
As shown in Figure 9, the working principle of line leakage system and method provided by the invention is as follows:
At conduit upper administration front end sensing subsystem, and be connected with leakage monitoring signal condition subtense angle by cable.System host powers on, and automatically carries out initial work.
Under system normal operation, gather dynamic pressure signal by dynamic pressure transducer, and the dynamic pressure signal described dynamic pressure transducer being collected by the first low-frequency amplification module amplifies, by the first low-pass filtering module, the high-frequency signal that exceedes target detection frequency in the dynamic pressure signal after amplifying is carried out to filtering processing; Being used for dynamic pressure signal after treatment after filtering by 4-20mA electric current loop transmitter module is converted to current signal and is sent to electric current loop receiving module.
Electric current loop receiving module receives after the signal on electric current loop, by signal recovery module, its isolation is converted to through the dynamic pressure signal amplifying, the second low-frequency amplification module is used for described dynamic pressure signal to amplify, and adjusts the measurement range of described line leakage system according to dynamic pressure variable quantity; For the dynamic pressure signal after amplifying is carried out after filtering processing higher than the high-frequency signal of monitoring objective frequency, the dynamic pressure signal data of pipe leakage are carried out to record through described the second low-pass filtering module.
After system powers on, temperature collect module is started working simultaneously, and in the time that temperature does not exceed predefined value, system is normally worked, and when temperature exceedes after threshold value, control unit regulates conditioning module parameter, revises the impact that temperature drift causes analogue signal.
In the time of system power failure, observation process finishes.
Line leakage system and method provided by the invention, front end sensors subtense angle is highly sensitive, to tiny signal also can produce reaction, signal to noise ratio high, be not subject to electromagnetic interference, compact structure, long service life, safe and reliable, in addition, adopt two-wire system electric current loop form to carry signal, conveniently realize long Distance Transmission and the processing of signal, can accurately react the state of changing of dynamic pressure in tested pipeline, monitoring accuracy is high, reaction velocity is fast, reliable and stable.
It should be noted last that, above embodiment is only unrestricted in order to technological scheme of the present invention to be described, although the present invention is had been described in detail with reference to example, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technological scheme of the present invention, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (9)
1. a line leakage system, is characterized in that, comprising:
Front end sensors subtense angle, is provided with the leakage monitoring signal condition subtense angle of electric current loop receiving module, signal recovery module, the second low-frequency amplification module and the second low-pass filtering module;
For pipeline was changed because of dynamic pressure in leakage moment, the dynamic pressure signal producing amplifies described front end sensors subtense angle, filtering is transformed to current signal after processing, more described current signal is sent to described testing signal conditioning subtense angle;
Described electric current loop receiving module receives for the current signal that front end sensing subsystem is sent;
Described signal recovery module is reduced to dynamic pressure signal for the current signal that electric current loop receiving module is received;
Described the second low-frequency amplification module is used for described dynamic pressure signal to amplify, and adjusts the measurement range of described line leakage system according to dynamic pressure variable quantity;
Described the second low-pass filtering module, for the dynamic pressure signal after amplifying is carried out after filtering processing higher than the high-frequency signal filtering of monitoring objective frequency, carries out record to the dynamic pressure signal data of pipe leakage.
2. line leakage system as claimed in claim 1, is characterized in that, described front end sensors subtense angle comprises:
Dynamic pressure transducer, the first low-frequency amplification module, the first low-pass filtering module and electric current loop transmitter module;
Dynamic pressure transducer, changes the dynamic pressure signal that produce because of dynamic pressure for gathering pipeline leaking moment;
Described the first low-frequency amplification module amplifies for the dynamic pressure signal that described dynamic pressure transducer is collected;
Described the first low-pass filtering module carries out filtering processing for the high-frequency signal that the dynamic pressure signal after amplifying is exceeded to target detection frequency;
Described electric current loop transmitter module is used for dynamic pressure signal after treatment after filtering and is converted to current signal and is sent to described leakage monitoring signal condition subtense angle.
3. line leakage system as claimed in claim 2, is characterized in that:
Described dynamic pressure transducer is the dynamic pressure transducer with particular job frequency, and it gathers pipe leakage dynamic pressure signal and responds in particular frequency range.
4. line leakage system as claimed in claim 3, is characterized in that:
Described dynamic pressure transducer is according to the frequency range 4Hz-10KHz of pipe leakage dynamic pressure, and the measuring frequency scope of setting front end sensing subsystem is <30KHz.
5. line leakage system as claimed in claim 1, is characterized in that, described leakage monitoring signal condition subtense angle also comprises:
Described temperature detecting module, for gathering the temperature value of Leak testtion signal condition subtense angle environment of living in, provides foundation for adjusting analogue signal gain;
The temperature information of described control unit for collecting by temperature detecting module, adjusts analogue signal gain in real time, makes system in the situation that ambient temperature changes, and measures range and remains unchanged.
6. a line leakage method, is characterized in that, comprising:
Dynamic pressure signal is gathered, more described dynamic pressure signal is amplified, after filtering processes, described dynamic pressure signal is converted into current signal output;
Described current signal is received, and the current signal receiving is reduced to dynamic pressure signal;
Described dynamic pressure signal is amplified, and adjust the measurement range of described line leakage system according to dynamic pressure variable quantity;
By filtering after processing higher than the high-frequency signal of monitoring objective frequency in the dynamic pressure signal after amplifying, the dynamic pressure signal data of pipe leakage are carried out to record.
7. line leakage method as claimed in claim 6, is characterized in that, described dynamic pressure signal is gathered, more described dynamic pressure signal is amplified, after filtering processes, described dynamic pressure signal is converted into current signal output and comprises:
Pipeline was gathered because dynamic pressure changes the dynamic pressure signal producing in leakage moment;
The described dynamic pressure transducer dynamic pressure signal collecting is amplified;
The high-frequency signal that exceedes target detection frequency in described dynamic pressure signal after amplifying is carried out to filtering processing;
Dynamic pressure signal after treatment is converted to current signal output after filtering.
8. line leakage method as claimed in claim 7, is characterized in that:
According to the frequency range 4Hz-10KHz of pipe leakage dynamic pressure, the dynamic pressure signal frequency range of collection is controlled to <30KHz.
9. line leakage method as claimed in claim 6, is characterized in that, also comprises:
When dynamic pressure signal is gathered, temperature data is gathered, provide foundation for adjusting analogue signal gain; Then according to the temperature information collecting, adjust in real time analogue signal gain, make system in the situation that ambient temperature changes, measure range and remain unchanged.
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