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Sensors 2015, 15(9), 24644-24661; doi:10.3390/s150924644

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

1
State Key Laboratory of Precision Measurement Technology and Instrument, Tianjin University, Tianjin 300072, China
2
Vacuum and Leak Detecting Division Beijing Institute of Spacecraft Environment Engineering, NO. 104 Youyi Road, Haidian District, Beijing 100094, China
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 6 August 2015 / Accepted: 18 September 2015 / Published: 23 September 2015
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [1230 KB, uploaded 23 September 2015]   |  

Abstract

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. View Full-Text
Keywords: continuous ultrasound; gas leakage; location; stiffener; sensor array continuous ultrasound; gas leakage; location; stiffener; sensor array
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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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Bian, X.; Li, Y.; Feng, H.; Wang, J.; Qi, L.; Jin, S. A Location Method Using Sensor Arrays for Continuous Gas Leakage in Integrally Stiffened Plates Based on the Acoustic Characteristics of the Stiffener. Sensors 2015, 15, 24644-24661.

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