Acoustic leak signal enhancement based on time-domain integration

doi:10.11949/j.issn.0438-1157.20151304

CIESC Journal ›› 2016, Vol. 67 ›› Issue (3): 797-804.DOI: 10.11949/j.issn.0438-1157.20151304

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Acoustic leak signal enhancement based on time-domain integration

LIN Weiguo¹, WANG Xiaodong¹, WU Haiyan¹, MU Changli², CHEN Lei¹

1. College of Information Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China;
2. Beijing Radiation Application and Research Center, Beijing 100015, China

Received:2015-08-13 Revised:2015-10-13 Online:2016-01-12 Published:2016-03-05
Contact: 67
Supported by:
supported by the Fundamental Research Funds for the Central Universities(YS0104),Foundation of State Key Laboratory of NBC Protection for Civilian(SKLNBC2014-10) and the National Natural Science Foundation of China (61403017).

基于时域积分的泄漏声波信号增强方法

林伟国¹, 王晓东¹, 吴海燕¹, 牟长丽², 陈磊¹

1. 北京化工大学信息科学与技术学院, 北京 100029;
2. 北京市射线应用研究中心, 北京 100015

通讯作者: 林伟国
基金资助:
中央高校基本科研业务费(YS0104);国民核生化灾害防护国家重点实验室基金项目(SKLNBC2014-10);国家自然科学基金项目(61403017)。

Abstract

Abstract:

Signal-to-Ratio (SNR) of leak signal is the main factor influencing on missing alarm and false alarm in pipeline leak detection. Traditional de-noising methods, such as wavelet transform and EMD decomposition, are hard to promise stable and effective signal enhancement because of the selection of wavelet base, decomposition scale or reconstruction components. Through analysis of the transfer function of dynamic pressure transducer, it is found that the integral part in the output signal of dynamic pressure transducer, which can reflect the low frequency response characteristics of acoustic signal, is missing. Therefore, a gain-adjustable acoustic signal enhancement method based on time-integration is proposed. The test results with field data show that the proposed method has better performance for the signal enhancement with precise location and no complex parameter optimization, and it also provides an effective technical support for small leak detection and decreasing of the missing and false alarm rate.

Key words: acoustic leak signal, time-integration, gain-adjustable, signal enhancement

摘要：

在管道泄漏检测中,泄漏信号的信噪比是影响误报和漏报的主要因素。传统的小波去噪和EMD分解方法受小波基选择、分解尺度选择和重构分量选择的影响难以保证稳定、有效的信号增强效果。通过分析动态压力变送器的传递函数,发现动态压力变送器的输出信号中缺失了反映声波信号低频响应特性的积分项,提出了基于时域积分的、增益可调的泄漏声波信号增强方法,现场实测数据的测试结果表明:基于时域积分的泄漏信号增强方法具有稳定显著的信号增强效果和定位精度,无需复杂的参数寻优,为微小泄漏的检测以及减少误报和漏报提供了有效的技术支持。

关键词: 泄漏声波信号, 时域积分, 增益可调, 信号增强

CLC Number:

TE973.6

LIN Weiguo, WANG Xiaodong, WU Haiyan, MU Changli, CHEN Lei. Acoustic leak signal enhancement based on time-domain integration[J]. CIESC Journal, 2016, 67(3): 797-804.

林伟国, 王晓东, 吴海燕, 牟长丽, 陈磊. 基于时域积分的泄漏声波信号增强方法[J]. 化工学报, 2016, 67(3): 797-804.

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Acoustic leak signal enhancement based on time-domain integration

基于时域积分的泄漏声波信号增强方法

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