On the selection of acoustic/vibration sensors for leak detection in plastic water pipes
On the selection of acoustic/vibration sensors for leak detection in plastic water pipes
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DOI：
10.1016/j.jsv.2004.05.004
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发表时间：
2005-05-20
影响因子：
4.7
通讯作者：
Hunaidi, O
中科院分区：
文献类型：
--
作者：
Gao, Y;Brennan, MJ;Hunaidi, O
从埋地配水管泄漏通常是通过应用相关技术的两个测得的声学/振动信号的泄漏的两侧。用于定位塑料管道泄漏的相关技术的有效性取决于所使用的传感器的类型及其灵敏度。基于在早期研究中建立的压力响应的互相关分析模型，本文研究了使用压力，速度和加速度传感器测量的泄漏信号的互相关系数的行为。理论预测表明，使用水听器的压力响应的测量是有效的测量有一个小的信号噪声比（SNR），但可以实现一个尖锐的峰值相关系数，如果使用加速度计。理论工作在一定程度上验证了测试数据从实际水管在加拿大的测试网站。(c)2004 Elsevier Ltd.保留所有权利。
Leaks from buried water distribution pipes are commonly located by applying the correlation technique to two measured acoustic/vibration signals on either side of a leak. The effectiveness of the correlation technique for locating leaks in plastic pipes depends on the type of sensors used and their sensitivities. Based on an analytical model of the cross-correlation of pressure responses established in an earlier study, this paper investigates the behaviour of the cross-correlation coefficient for leak signals measured using pressure, velocity and acceleration sensors. Theoretical predictions show that a measure of pressure responses using hydrophones is effective for measurements where there is a small signal-to-noise ratio (SNR), but a sharper peak correlation coefficient can be achieved if accelerometers are used. The theoretical work is validated to some extent with test data from actual water pipes on a test site in Canada. (c) 2004 Elsevier Ltd. All rights reserved.