CN85102576A - Fluid leaking detecting anti-disturbance method and device - Google Patents
Fluid leaking detecting anti-disturbance method and device Download PDFInfo
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- CN85102576A CN85102576A CN 85102576 CN85102576A CN85102576A CN 85102576 A CN85102576 A CN 85102576A CN 85102576 CN85102576 CN 85102576 CN 85102576 A CN85102576 A CN 85102576A CN 85102576 A CN85102576 A CN 85102576A
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Abstract
The present invention is a kind of method and apparatus that can improve the fluid leaking detecting antijamming capability, is to belong to the technology that detects the leakage position that is embedded in the underground fluid pipeline.It is the coherence of utilizing between the leakage sound that the leakage sound directly obtained from the fluid line and ground detects, carry out relevant treatment, finish the raising antijamming capability, reach from ground and survey the escape of liquid sound that is submerged in the noise background, determine leaking position of pipeline.Be applicable to the leak detection that is embedded in underground water, oil, gas pipeline.
Description
The present invention belongs to the technology that detects the leakage position that is embedded in the underground fluid pipeline.
That produces at present both at home and abroad can directly search the instrument of burying underground fluid (tap water) pipeline leakage current body (water) position underground on the ground, because that leakage current body (water) sound passes to ground is very faint, the interference of various vibrations in extraneous ground and sound is very strong.Leakage current body (water) sound is submerged in the background of these Back drops often.Present instrument can not be distinguished leakage current body (water) sound and sound is disturbed by extraneous portion, detect when the people is quiet at dead of night usually, and effect is also undesirable.
The present invention provides a kind of method and apparatus that can improve the fluid leaking detecting antijamming capability.Apparatus with this method design has anti-ambient noise ability, can directly search the position of burying underground fluid line leakage current body underground on the ground, is convenient to repair.
The present invention is the coherence of utilizing between the leakage sound that the leakage sound directly obtained from the fluid line and ground detects, carry out relevant treatment, finish the raising antijamming capability, reach from ground and survey the escape of liquid sound that is submerged in the noise background, determine leaking position of pipeline.
A kind of device that can realize this invention is by main detector, reference detector, and associative processor is formed.By the chatter signal of reference detector when pipeline is obtained escape of liquid, after amplifying, be defeated by associative processor as the reference signal.Survey leakage point with main detector and pass to ground leakage chatter signal, be defeated by the signal that associative processor, associative processor send here two probers after the amplification and carry out relevant treatment, determine the position of leakage point.
The present invention has following advantage:
(1) have strong antijamming capability, can detection that carry out the escape of liquid position under the condition of ambient noise arranged.
(2) moved on to daytime fluid (water) the Leak testtion operating time from the late into the night, alleviate the intensity of leak detection work.
(3) detection sensitivity is improved, and can be applicable to the detection of the northern area water leakage that water supply pipe buries deeplyer.
Description of drawings
Fig. 1 improves the principle of device block diagram of fluid leaking detecting antijamming capability
A escape of liquid place.Detection place of B reference probe
The pipeline of C conveyance fluid.E earth matter
1 main detector, 2 reference detectors
3 associative processors
Fig. 2 main detector block diagram
4 main detectors, 5 low noise amplifiers of popping one's head in
6 bandpass amplifiers
Fig. 3 reference detector block diagram
7 reference detectors, 8 low noise amplifiers of popping one's head in
9 transmitters, 10 transmitting antennas
Fig. 4 associative processor block diagram
11 receiving antennas, 12 receiving machines
13 phase-shift circuits, 14 automatic amplitude control circuits
15 conensers, 16 square-wave generators
17 analog multipliers, 18 synchronous integrators
19 Phase sensitive detectors, 20 low-pass filters and dc amplifier
21 indication gauge outfits, 22 earphones
Describe in detail
Leak detection with tap water is example explanation the present invention
Method skeleton diagram of the present invention as shown in Figure 1.By main detector (1), reference detector (2), associative processor (3) is formed.Water supply pipe (C) is embedded under the earth (E), and leakage point is (A).Locate the electrical signal that (can be the valve of tap water) takes out the sound that leaks at water supply pipe (B) with reference detector.The block diagram of reference detector as shown in Figure 2.By reference detector probe (7), low-noise preamplifier (8), transmitter (9), transmitting antenna (10) is formed.The acoustic energy that leaks is uploaded farly at water supply pipe, and it is little to decay.Valve is again in missile silo, and environment is quiet, and then the signal that records of reference detector can be thought the sheet acoustic signal of leaking.Through amplifying, go out by transmitter and wireless transmission.
On the ground, top of leakage point (A), receive the chatter signal that the sound that leaks passes to ground with main detector.The block diagram of main detector as shown in Figure 2.By main detector probe (4), low noise amplifier (5), bandpass amplifier (6) is formed.Main detector receives the acoustic signal of leaking with its probe.Surrounding environment exists noise also to be received by probe, and then the signal of probe output is the signal that sound and ambient noise mix that leaks.Sometimes the sound that leaks is submerged among the noise.Amplify through low-noise preamplifier, by the bandpass amplifier elimination outer noise (passband of bandpass amplifier is selected in about 100Hz～2KHz) of acoustic signal frequency spectrum that leaks, the output signal of bandpass amplifier is given the analog multiplier of associative processor.
The block diagram of associative processor as shown in Figure 4.By receiving antenna (11), receiving machine (12) receives the acoustic signal of being sent by reference detector of leaking by the detection of (B) point.(also can transmit, directly the sound that leaks of audio frequency be given the phase shifter of associative processor with cable from reference detector without wireless.) radio signal that receives of receiving machine is through detection, recovers the acoustic signal of leaking of reference probe.Pass through phase shifter (13) again, automatic amplitude control circuit (14) is given phase modulation circuit, square-wave generator (16) control phase modulation circuit, and the reference that automatic amplitude control circuit is sent here the acoustic signal of leaking is carried out 0 °, 180 ° of phase modulation.Signal behind the phase modulation is given the signal that analog multiplier (17) and subjective prober send here and is multiplied each other.In the output signal of multiplier and the synchronous signal of square-wave generator be exactly coherent signal between two probers.Use by the square signal of square-wave generator output and extract coherent signal, elimination noise and interference as the synchronous integrator (18) of reference signal.This signal can use earphone (22) to monitor.The output signal of synchronous integrator is through Phase sensitive detector (19), and low-pass filter and dc amplifier (20) carry out synchronous demodulation and become direct current signal.Indicate with gauge outfit (21).
As long as have directly relevant in the signal that main detector is surveyed from the acoustic signal of leaking that the tap water pipe detects with reference detector.Gauge outfit just has the VDC indication.Otherwise gauge outfit indication mean value is 0.Gauge outfit indication maximum (sound that promptly leaks is the strongest) is found in mobile main detector probe position on the ground.The leakage point A of water supply pipe is just under probe ground.For other ambient noise and interference,, be output as 0 because the signal of sending here with reference detector is uncorrelated.She Ji fluid leaking detecting has very strong antijamming capability in this way.
Another main points of this method are: the frequency spectrum based on the sound that leaks is very abundant, according to measure and the interrelated data spectrum distribution between 100Hz-2KHz.Therefore in associative processor, adopted phase-shift circuit, this circuit design must make the different frequency between the 100Hz-2KHz have different phase-shift phases.The difference that makes the lower frequency phase-shift phase is greater than 100 °, no matter so just can guarantee under what conditions, between the coherent signal of two probers, only may be on certain a bit of frequency band phase difference about 90 °, greatly their phase difference of coherent signal frequency spectrum of part departs from 90 °, thereby on the whole, the output amplitude of having eliminated synchronous integrator is relevant with the coherent signal phase difference between two probers.Thereby can think: the phase difference between signals of sending here with two probers when surveying the leakage point position has nothing to do.Thereby theoretical calculation and utility unit have been simplified.
Claims (4)
1, the present invention is a kind of method that can improve the fluid leaking detecting antijamming capability.Feature of the present invention is: utilize the coherence between the leakage sound that the leakage sound directly obtained from the fluid line and ground detects, carry out relevant treatment, finish the raising antijamming capability, reach from ground and survey the escape of liquid sound that is submerged in the noise background, determine leaking position of pipeline.
2, a kind of fluid leaking detecting that is exclusively used in claim 1 described " a kind of method that can improve the fluid leaking detecting antijamming capability ", it is that relevant treatment is formed (3) by the reference detector (2) of main detector (1) and formation feature of the present invention.
3, " fluid leaking detecting " according to claim 2 indication is characterized in that: by the chatter signal of reference detector when pipeline is obtained escape of liquid, be defeated by associative processor after amplifying.Survey leakage point (A) by main detector and pass to ground leakage chatter signal, be defeated by associative processor after the amplification, by associative processor the signal of two probers is carried out relevant treatment again, determine the position of leakage point.
4, " associative processor " according to claim 2 indication is characterized in that: to carrying out phase shift and phase modulation with reference to the signal of surveying, multiply each other with the signal of main detector, then through synchronous integrator and synchronous demodulator output correlation signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85102576 CN85102576A (en) | 1985-04-01 | 1985-04-01 | Fluid leaking detecting anti-disturbance method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85102576 CN85102576A (en) | 1985-04-01 | 1985-04-01 | Fluid leaking detecting anti-disturbance method and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN85102576A true CN85102576A (en) | 1986-09-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85102576 Pending CN85102576A (en) | 1985-04-01 | 1985-04-01 | Fluid leaking detecting anti-disturbance method and device |
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| CN (1) | CN85102576A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102072408A (en) * | 2009-11-23 | 2011-05-25 | 中国科学院生态环境研究中心 | Leakage detecting method for urban water supply pipes |
| CN111208519A (en) * | 2020-01-17 | 2020-05-29 | 西安探管者探测技术有限公司 | Underground pipeline depth measuring device and method |
-
1985
- 1985-04-01 CN CN 85102576 patent/CN85102576A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102072408A (en) * | 2009-11-23 | 2011-05-25 | 中国科学院生态环境研究中心 | Leakage detecting method for urban water supply pipes |
| CN111208519A (en) * | 2020-01-17 | 2020-05-29 | 西安探管者探测技术有限公司 | Underground pipeline depth measuring device and method |
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