A Location Method Using Sensor Arrays for Continuous Gas Leakage in Integrally Stiffened Plates Based on the Acoustic Characteristics of the Stiffener

Sensors

Xu Bian¹  Yibo Li¹  Hao Feng¹  Jiaqiang Wang¹  Lei Qi²  Shijiu Jin¹ 

[1] State Key Laboratory of Precision Measurement Technology and Instrument, Tianjin University, Tianjin 300072, China; E-Mails:;Vacuum and Leak Detecting Division Beijing Institute of Spacecraft Environment Engineering, NO. 104 Youyi Road, Haidian District, Beijing 100094, China; E-Mail:

关键词: continuous ultrasound;    gas leakage;    location;    stiffener;    sensor array;   

DOI  :  10.3390/s150924644

来源: mdpi

【 摘 要 】

This paper proposes a continuous leakage location method based on the ultrasonic array sensor, which is specific to continuous gas leakage in a pressure container with an integral stiffener. This method collects the ultrasonic signals generated from the leakage hole through the piezoelectric ultrasonic sensor array, and analyzes the space-time correlation of every collected signal in the array. Meanwhile, it combines with the method of frequency compensation and superposition in time domain (SITD), based on the acoustic characteristics of the stiffener, to obtain a high-accuracy location result on the stiffener wall. According to the experimental results, the method successfully solves the orientation problem concerning continuous ultrasonic signals generated from leakage sources, and acquires high accuracy location information on the leakage source using a combination of multiple sets of orienting results. The mean value of location absolute error is 13.51 mm on the one-square-meter plate with an integral stiffener (4 mm width; 20 mm height; 197 mm spacing), and the maximum location absolute error is generally within a ±25 mm interval.

【 授权许可】

CC BY   
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