Development of high temperature acoustic emission sensing system using fiber Bragg grating
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In some applications in structural health monitoring (SHM), the acoustic emission (AE) detection technology is used in the high temperature environment. In this paper, a high-temperature-resistant AE sensing system is developed based on the fiber Bragg grating (FBG) sensor. A novel high temperature FBG AE sensor is designed with a high signal-to-noise ratio (SNR) compared with the traditional FBG AE sensor. The output responses of the designed sensors with different sensing fiber lengths also are investigated both theoretically and experimentally. Excellent AE detection results are obtained using the proposed FBG AE sensing system over a temperature range from 25 ℃ to 200 ℃. The experimental results indicate that this FBG AE sensing system can well meet the application requirement in AE detecting areas at high temperature.
KeywordsOptical sensor high temperature fiber Bragg grating acoustic emission
This research is supported by the National Natural Science Foundation of China (Grant Nos. 61403233, 61503218, 61573226, and 61473176), the Excellent Young and Middle-Aged Scientist Award Grant of Shandong Province of China (No. BS2013DX018), and the Natural Science Foundation of Shandong Province for Outstanding Young Talents (No. ZR2015JL021).
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