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6 April 2012 Ultrasonic gas accumulation detection and evaluation in nuclear cooling pipes
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This paper presents a novel ultrasonic guided wave based inspection methodology for detecting and evaluating gas accumulation in nuclear cooling pipe system. The sensing is in-situ by means of low-profile permanently installed piezoelectric wafer sensors to excite interrogating guided waves and to receive the propagating waves in the pipe structure. Detection and evaluation is established through advanced cross time-frequency analysis to extract the phase change in the sensed signal when the gas is accumulating. A correlation between the phase change and the gas amount has been established to provide regulatory prediction capability based on measured sensory data.
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Lingyu Yu, Bin Lin, Yong-June Shin, Jingjiang Wang, and Zhenhua Tian "Ultrasonic gas accumulation detection and evaluation in nuclear cooling pipes", Proc. SPIE 8345, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2012, 83454U (6 April 2012);

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