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| Leakage location method based on an ultrasonic sensor array |
| BIAN Xu1,ZHANG Yu1,WANG Jiaqiang1,LI yibo1,JIN Shijiu1,SUN lichen2,QI Lei2 |
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,Beijing 100094,China |
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Abstract Based on an ultrasonic sensor array,a method for leakage location of pressure containers (such as spacecraft) was proposed.When the leaking happens,the method could accomplish the fast and accurate location of leakage source through acquiring a set of ultrasonic signals on the wall of container by using an ultrasonic sensor array,and analyzing the time-space correlation among all the data collected by each sensor in the array.Moreover, the propagation characteristics of leakage signals in a thin plate were analysed.It proves that the correlation between the collected signals will decrease as the distances between the collection points increase,which provides a reference to the design of sensor arrays.Meanwhile,the related experiments were designed to discuss the location accuracy of different sensor arrays with different distances between the sensors in the array.According to the experimental results,the location error is influenced by the number of sensors and the distances between them in the array.When the number of sensors in the array is eight,and the distances between them are 8mm,the mean value of the absolute location error is less than 10mm on a one square meter plate.
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Received: 30 October 2015
Published: 15 March 2017
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