CN102797979B - Device for detecting leakage points of underground pipeline and method thereof - Google Patents

Device for detecting leakage points of underground pipeline and method thereof Download PDF

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Publication number
CN102797979B
CN102797979B CN201210311439.7A CN201210311439A CN102797979B CN 102797979 B CN102797979 B CN 102797979B CN 201210311439 A CN201210311439 A CN 201210311439A CN 102797979 B CN102797979 B CN 102797979B
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China
Prior art keywords
signal
point
leakage points
underground pipeline
sensing point
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CN201210311439.7A
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Chinese (zh)
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CN102797979A (en
Inventor
尹武良
李安阳
陈丽婷
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上海海事大学
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Priority to CN201210311439.7A priority Critical patent/CN102797979B/en
Publication of CN102797979A publication Critical patent/CN102797979A/en
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Publication of CN102797979B publication Critical patent/CN102797979B/en

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Abstract

The invention provides a device for detecting leakage points of an underground pipeline and the method thereof. The device for detecting leakage points of an underground pipeline comprises a shell and a functional circuit positioned in the shell, wherein the functional circuit comprises a digital signal processor and a differential-type acoustoelectric sensor probe; the digital signal processor is connected with a man-machine control circuit, a display circuit and a peripheral circuit; the differential-type acounstoelectric sensor probe is connected with the digital signal processor through a signal modulating circuit, detects vibrating signals generated by leakage points of the underground pipeline and transmits the signals to the digital signal processor; and after the direction of the leakage points is confirmed, the scope of the leakage points is confirmed step by step by detecting and comparing signal characteristics for a plurality of times. The device for detecting leakage points of an underground pipeline and the method thereof can be used for detecting the leakage points of the underground pipeline under the conditions of not removing covering earth and being not influenced by outside noises and other factors, and conveniently and accurately check the leakage points of the underground water or gas pipeline and the positions of the leakage points by directly detecting the land above the pipeline, and have the advantages of firm structure, stable performance, durability and simplicity in operation.

Description

The sniffer of underground pipeline leakage point and method
Technical field
The present invention relates to acoustoelectric sensor technical field, be specifically related to the device and method that a kind of underground water based on coil type acoustoelectric sensor, feed channel leakage point are surveyed.
Background technology
Underground water, feed channel are widely used in current city fundamental construction, occupy position of crucial importance in national economic development and the people's productive life.But due to its disguise, if there is the situation of Pipeline damage, leakage, be difficult to arrive at ground observation, will cause serious waste to resource, the people's productive life is caused to serious impact, even can cause potential safety hazard.The serious consequence that will cause for pipe leakage, causes the attention of Liao Ge stratum, thereby has occurred that a group specializes in underground water, feed channel " listen leak work ".It is too high that but this work requires for staff's experience, and working time section can only be limited to the late into the night that noise is very little.For above-mentioned situation, through the interview to " listen and leak work " and the careful research to leak point characteristic, the underground water of having designed and developed, the device and method that feed channel leakage point is surveyed, realize and be not subject to, under the impact of working time and ambient noise, fast, simply, not excavate in earthing situation leak point is surveyed.
In existing achievement in research, the detection method of underground water, feed channel leakage point is mainly based on simple physics missed stick, experience to staff and hearing require too high, and the working time can only be limited to the late into the night that noise is relatively little, long-time ear-drum and healthy impacting to staff; Therefore, be necessary to design a kind of cost lower, be not subject to the impact of working time and ambient noise, and simple and practical detection method, not excavating in earthing situation, quickly and accurately leak point is surveyed.
Summary of the invention
The object of this invention is to provide a kind of sniffer and method of underground pipeline leakage point, do not excavate earthing, be not subject to the impact of the factors such as ambient noise, by directly soil, top, pipeline earth's surface being surveyed and realized the object that accurately detects underground water, feed channel leak point and position thereof.
The present invention for the technical scheme that its technical matters of solution adopts is,
The sniffer of underground pipeline leakage point, include housing and be arranged in the functional circuit of housing, this functional circuit includes digital signal processor, digital signal processor is connected with man-machine control circuit, display circuit and peripheral circuit, also include differential type acoustoelectric sensor probe, this probe is connected with digital signal processor by signal conditioning circuit, the vibration signal that probe detection underground pipeline leakage point sends, and transmit signals to digital signal processor.
The bottom of probe has metallic membrane, its inside has magnet and coil, metallic membrane is connected with coil, the vibration signal that underground pipeline sends makes metallic membrane resonance, and be with moving winding to vibrate in magnetic field, thereby generation induced voltage, coil is connected with signal conditioning circuit by wire, and induced voltage is passed into signal conditioning circuit.
On housing, be connected with telescopic feeler.
Man-machine control circuit is provided with vibration signals collecting frequency range, comprising: low-frequency range 60~80Hz, Mid Frequency 80~250Hz, high band 250~600Hz.
Signal conditioning circuit is nursed one's health the induced voltage amplitude of coil between 0~3V, and its frequency is remained between 60Hz~250Hz.
The method of utilizing said apparatus Underground pipe leakage point, comprises the following steps:
1) near underground pipeline to be measured, place sniffer, will pop one's head in and paste on the ground, make feeler perpendicular to the ground, gather successively the signal of low-frequency range, Mid Frequency and high band by man-machine control circuit;
2) digital signal processor carries out Treatment Analysis to the signal of three collections, if signal presents following features: three frequency band signals are complete and stable, the amplitude of the relative medium-high frequency section of amplitude of low-frequency range is larger, judges near this sensing point and has leakage point;
3) move towards along underground pipeline, apart from 100~500 meters of of sensing point last time, select again a sensing point, repeating step 1), 2) work, and the signal of the signal of collection and last time is compared, increase if the amplitude of discovery low-band signal is compared last time, illustrate that this sensing point is nearer than the sensing point of last time with the distance of leakage point, should continue to carry out forward next time and survey; If find that low-band signal amplitude reduced relative last time, the distance that this sensing point and leakage point be described than last time sensing point farther, should be along getting sensing point in the other direction;
4), after definite leakage point direction, only preserve the last signal data gathering, for comparing with surveying next time, repeating step 1), 2), 3) work, progressively determine the scope of leakage point.
When underground pipeline leaks, leaks gas, under the effect of water, air pressure, tube wall and external agency impact, rub, just produce certain sound that leaks, leaks gas, this sound that leaks is made up of three parts: 1. water, gas impact surrounding medium for a long time, is leaking, leaking gas outer formation cavity, form a resonant cavity, the amplitude of this place's sound is larger, and frequency is lower, mainly concentrates between 60~80Hz; 2. water, gas impact tube wall, produce chatter, and its frequency is between 80~250Hz; 3. water, gas are gone out after tube wall, impact surrounding medium, and as clay, sandstone or loess etc. produce the sound, its frequency is wider, mainly concentrates on 250~600Hz.Based on above-mentioned principle, the man-machine control circuit of sniffer arranges three and gathers frequency range: low-frequency range 60~80Hz, Mid Frequency 80~250Hz, high band 250~600Hz.
The invention has the advantages that, this sniffer and method realized in the case of not excavating earthing, be not subject to Underground pipe leakage point the impact of the factors such as ambient noise, by directly to soil, pipeline top survey can facilitate detect accurately underground water, whether feed channel has leak point and leak source position thereof, its sound construction, stable performance, durable in use, simple to operate.
Accompanying drawing explanation
Fig. 1 is the system construction drawing of the sniffer that proposes of the present invention;
Fig. 2 is the acoustic-electric sonde configuration schematic diagram of this sniffer.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach object and effect is easy to understand, below in conjunction with diagram and specific embodiment, further set forth the present invention.
The sniffer of the underground pipeline leakage point that the present invention proposes includes housing and is arranged in the functional circuit of housing, as shown in Figure 1, this functional circuit includes digital signal processor, digital signal processor is connected with man-machine control circuit, display circuit and peripheral circuit, also include differential type acoustoelectric sensor probe, this probe is connected with digital signal processor by signal conditioning circuit, the vibration signal that probe detection underground pipeline leakage point sends, and transmit signals to digital signal processor.
As shown in Figure 2, the bottom of probe has metallic membrane, its inside has magnet and coil, metallic membrane is connected with coil, the vibration signal that underground pipeline sends makes metallic membrane resonance, and is with moving winding to vibrate in magnetic field, thereby produces induced voltage, coil is connected with signal conditioning circuit by wire, and induced voltage is passed into signal conditioning circuit.
In addition, for convenience of the carrying out of detection operations, be connected with telescopic feeler on housing, whole installation weight is lighter, is easy to carry.
Man-machine control circuit is provided with vibration signals collecting frequency range, comprising: low-frequency range 60~80Hz, Mid Frequency 80~250Hz, high band 250~600Hz.Signal conditioning circuit is nursed one's health the induced voltage amplitude of coil between 0~3V, and its frequency is remained between 60Hz~250Hz.
Digital signal processor is selected TMS320X281xDSP, and its peripheral circuit provides processor work needed power supply, the circuit such as reset, clock.
It is integrated that this device employing data acquisition, analyzing and processing, result show, can reproduce in real time conduit running situation.
The method of utilizing said apparatus Underground pipe leakage point, comprises the following steps:
1) near underground pipeline to be measured, place sniffer, will pop one's head in and paste on the ground, make feeler perpendicular to the ground, gather successively the signal of low-frequency range, Mid Frequency and high band by man-machine control circuit;
2) digital signal processor carries out Treatment Analysis to the signal of three collections, if signal presents following features: three frequency band signals are complete and stable, the amplitude of the relative medium-high frequency section of amplitude of low-frequency range is larger, judges near this sensing point and has leakage point;
3) move towards along underground pipeline, apart from 100~500 meters of of sensing point last time, select again a sensing point, repeating step 1), 2) work, and the signal of the signal of collection and last time is compared, increase if the amplitude of discovery low-band signal is compared last time, illustrate that this sensing point is nearer than the sensing point of last time with the distance of leakage point, should continue to carry out forward next time and survey; If find that low-band signal amplitude reduced relative last time, the distance that this sensing point and leakage point be described than last time sensing point farther, should be along getting sensing point in the other direction;
4), after definite leakage point direction, only preserve the last signal data gathering, for comparing with surveying next time, repeating step 1), 2), 3) work, progressively determine the scope of leakage point.
If sniffer is placed on to the reserved observation port of pipeline (as the pipeline exposing under well lid), effect can be better.
This sniffer and method realized in the case of not excavating earthing, be not subject to Underground pipe leakage point the impact of the factors such as ambient noise, by directly to soil, pipeline top survey can facilitate detect accurately underground water, whether feed channel has leak point and leak source position thereof, its sound construction, stable performance, durable in use, simple to operate.
More than show and described ultimate principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and instructions, describes just illustrates principle of the present invention; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.

Claims (1)

1. the detection method of underground pipeline leakage point, is characterized in that, comprises the following steps:
1) near underground pipeline to be measured, place sniffer, will pop one's head in and paste on the ground, make feeler perpendicular to the ground, gather successively the signal of low-frequency range, Mid Frequency and high band by man-machine control circuit;
2) digital signal processor carries out Treatment Analysis to the signal of three collections, if signal presents following features: three frequency band signals are complete and stable, the amplitude of the relative medium-high frequency section of amplitude of low-frequency range is larger, judges near this sensing point and has leakage point;
3) move towards along underground pipeline, apart from 100~500 meters of of sensing point last time, select again a sensing point, repeating step 1), 2) work, and the signal of the signal of collection and last time is compared, increase if the amplitude of discovery low-band signal is compared last time, illustrate that this sensing point is nearer than the sensing point of last time with the distance of leakage point, should continue to carry out forward next time and survey; If find that low-band signal amplitude reduced relative last time, the distance that this sensing point and leakage point be described than last time sensing point farther, should be along getting sensing point in the other direction;
4), after definite leakage point direction, only preserve the last signal data gathering, for comparing with surveying next time, repeating step 1), 2), 3) work, progressively determine the scope of leakage point.
CN201210311439.7A 2012-08-29 2012-08-29 Device for detecting leakage points of underground pipeline and method thereof CN102797979B (en)

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Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104570899B (en) * 2015-01-19 2017-08-25 广州杰赛科技股份有限公司 Environmental monitoring installation and its power control method
CN104677402A (en) * 2015-03-09 2015-06-03 四川蓝讯宝迩电子科技有限公司 Underground pipeline-monitoring sensor mounting box
CN104660164B (en) * 2015-03-09 2017-07-28 陶如意 The compact photovoltaic switch board being easily installed
CN104791223A (en) * 2015-03-23 2015-07-22 苏州固基电子科技有限公司 Air valve with pipe leakage detection function
CN106641741B (en) * 2016-12-22 2018-12-07 江苏晟尔检测仪器有限公司 A kind of device and method of the breaking point of the outer wall erosion resistant coating of the super buried depth pipeline of detection
CN107461611B (en) * 2017-08-24 2019-07-09 南京邮电大学 The leakage detection method and leak detecting device combined is reconstructed based on small echo and EMD
CN108870091B (en) * 2018-07-19 2019-09-10 东北大学 Line leakage system and method based on low-and high-frequency hybrid detection
CN109882741A (en) * 2019-03-15 2019-06-14 湘潭大学 A kind of blockage of sewer detection method

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CN2611870Y (en) * 2003-04-04 2004-04-14 高为粮 Inching motion transducer
CN2819239Y (en) * 2005-03-02 2006-09-20 王明时 Infrared built-in pipeline detector
CN101256095A (en) * 2007-03-01 2008-09-03 中国石油天然气股份有限公司 Pipe safety prewarning monitoring system
CN101871834A (en) * 2010-04-23 2010-10-27 北京中科通视科技有限公司 Wireless remote water leakage detection device and system

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Publication number Priority date Publication date Assignee Title
CN2611870Y (en) * 2003-04-04 2004-04-14 高为粮 Inching motion transducer
CN2819239Y (en) * 2005-03-02 2006-09-20 王明时 Infrared built-in pipeline detector
CN101256095A (en) * 2007-03-01 2008-09-03 中国石油天然气股份有限公司 Pipe safety prewarning monitoring system
CN101871834A (en) * 2010-04-23 2010-10-27 北京中科通视科技有限公司 Wireless remote water leakage detection device and system

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