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25 November 2009 Optical fiber extrinsic Fabry-Perot interferometer sensors for ultrasound detection
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Proceedings Volume 7634, Optical Sensors and Biophotonics; 763410 (2009)
Event: Asia Communications and Photonics, 2009, Shanghai, Shanghai , China
In this paper, a new method is proposed to fabricate an optical fiber extrinsic Fabry-Perot interferometer (EFPI) as an ultrasonic sensor. An acoustic emission detecting system is constructed based on multiple EFPI sensors and demodulation circuit. Ultrasound detection experiments were done from both traditional piezoelectric transducer (PZT) and high voltage discharge. In the experiments, strong ultrasound signals were detected in both cases. The signal attenuation related to the distance and the angle between the acoustic emission source and the FP sensor are obtained. The results indicate that the receiving angle of the FP sensor is nearly 90° and the maximum detection distance in the air is more than 200cm. Furthermore, four sensors are used to locate the position of the ultrasound source produced by high voltage discharge.
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Qingguo Sun, Na Chen, Yuetong Ding, Zhenyi Chen, and Tingyun Wang "Optical fiber extrinsic Fabry-Perot interferometer sensors for ultrasound detection", Proc. SPIE 7634, Optical Sensors and Biophotonics, 763410 (25 November 2009);

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