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Publication numberWO2001051904 A3
Publication typeApplication
Application numberPCT/CA2001/000030
Publication date29 Nov 2001
Filing date12 Jan 2001
Priority date14 Jan 2000
Also published asCA2397174A1, CA2397174C, DE60114366D1, DE60114366T2, EP1250578A2, EP1250578B1, US6453247, WO2001051904A2
Publication numberPCT/2001/30, PCT/CA/1/000030, PCT/CA/1/00030, PCT/CA/2001/000030, PCT/CA/2001/00030, PCT/CA1/000030, PCT/CA1/00030, PCT/CA1000030, PCT/CA100030, PCT/CA2001/000030, PCT/CA2001/00030, PCT/CA2001000030, PCT/CA200100030, WO 0151904 A3, WO 0151904A3, WO 2001/051904 A3, WO 2001051904 A3, WO 2001051904A3, WO-A3-0151904, WO-A3-2001051904, WO0151904 A3, WO0151904A3, WO2001/051904A3, WO2001051904 A3, WO2001051904A3
InventorsOsama Hunaidi
ApplicantCa Nat Research Council, Osama Hunaidi
Export CitationBiBTeX, EndNote, RefMan
External Links: Patentscope, Espacenet
Pc multimedia-based leak detection system for water transmission and distribution pipes
WO 2001051904 A3
Abstract
This invention pertains to the detection of leaks in plastic water distribution pipes by processing the sound or vibration induced in the pipe by water escaping under pressure. Acoustic leak signals are measured at two (or more) contact points with the pipe, e.g., fire hydrants or valves, using vibration sensors or hydrophones. The signals are digitally recorded using the computer's soundcard. The leak is located using the difference in arrival times of two leak signals as determined from the cross-correlation function traditionally used in leak detection applications or an enhanced impulse response function. The enhanced impulse response function eliminates the need to filter leak signals before processing and hence avoids the uncertainty involved in selecting filter cutoff frequencies for non-experts. Listening to leak sound in plastic pipes is made possible in software by shifting their low-frequency content to an audible higher range. The software implementation of this system can be readily integrated with commercially available RF-based data transmitters and leak sensors - thus providing a complete, fexible, and inexpensive leak detection system.
Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
EP0711986A2 *1 Nov 199515 May 1996AT&T Corp.Underground conduit defect localization
JPH11201859A * Title not available
US4083229 *28 Sep 197611 Apr 1978Plaunt & Anderson Company, Inc.Method and apparatus for detecting and locating fluid leaks
US4543817 *31 Mar 19831 Oct 1985Hitachi, Ltd.Method of detecting a leakage of fluid
US5038614 *10 Aug 198913 Aug 1991Atlantic Richfield CompanyAcoustic vibration detection of fluid leakage from conduits
US5416724 *9 Oct 199216 May 1995Rensselaer Polytechnic InstituteDetection of leaks in pipelines
US5974862 *6 May 19972 Nov 1999Flow Metrix, Inc.Method for detecting leaks in pipelines
Non-Patent Citations
Reference
1 *PATENT ABSTRACTS OF JAPAN vol. 1999, no. 12 29 October 1999 (1999-10-29)
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US92915208 Jun 201222 Mar 2016Mueller International, LlcFire hydrant leak detector
US95289031 Oct 201427 Dec 2016Mueller International, LlcPiezoelectric vibration sensor for fluid leak detection
US95939998 Jun 201214 Mar 2017Mueller International, LlcEnclosure for leak detector
Classifications
International ClassificationG01M3/24
Cooperative ClassificationG01M3/243
European ClassificationG01M3/24B
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