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Sensors 2017, 17(9), 2104; https://doi.org/10.3390/s17092104

Leak Detection and Location of Water Pipes Using Vibration Sensors and Modified ML Prefilter

1
School of Electronics and Information Engineering, Korea Aerospace University, Goyang-City, Gyeonggi-do 10540, Korea
2
Energy Solution/Business Team, LG CNS Co., Ltd., Yeongdeungpo-gu, Seoul 07320, Korea
*
Author to whom correspondence should be addressed.
Received: 28 July 2017 / Revised: 9 September 2017 / Accepted: 11 September 2017 / Published: 13 September 2017
(This article belongs to the Section Physical Sensors)
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Abstract

This paper proposes a new leak detection and location method based on vibration sensors and generalised cross-correlation techniques. Considering the estimation errors of the power spectral densities (PSDs) and the cross-spectral density (CSD), the proposed method employs a modified maximum-likelihood (ML) prefilter with a regularisation factor. We derive a theoretical variance of the time difference estimation error through summation in the discrete-frequency domain, and find the optimal regularisation factor that minimises the theoretical variance in practical water pipe channels. The proposed method is compared with conventional correlation-based techniques via numerical simulations using a water pipe channel model, and it is shown through field measurement that the proposed modified ML prefilter outperforms conventional prefilters for the generalised cross-correlation. In addition, we provide a formula to calculate the leak location using the time difference estimate when different types of pipes are connected. View Full-Text
Keywords: leakage detection; vibration sensor; time difference estimation; generalised cross-correlation; maximum-likelihood (ML) prefilter leakage detection; vibration sensor; time difference estimation; generalised cross-correlation; maximum-likelihood (ML) prefilter
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Choi, J.; Shin, J.; Song, C.; Han, S.; Park, D.I. Leak Detection and Location of Water Pipes Using Vibration Sensors and Modified ML Prefilter. Sensors 2017, 17, 2104.

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