28 August 2009 Open-loop Sagnac optical fiber sensor for detecting acoustic emission
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Proceedings Volume 7382, International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging; 738214 (2009) https://doi.org/10.1117/12.834823
Event: International Symposium on Photoelectronic Detection and Imaging 2009, 2009, Beijing, China
Abstract
A novel open loop Sagnac optical fiber sensing system for detecting AE(acoustic emission) has been proposed and demonstrated. The fiber loop of the Sagnac interferometer was cut off and formed two fiber ports, they were bound and made into the fiber probe. It was placed in the front of the reflector attached to the measured solid. The light from one port was reflected by the reflector and injected into the other fiber port. On the basis of the output optical field distribution function, the position of maximum reflected light intensity was theoretically analyzed. The best work region between the fiber probe and the reflector was ascertained by the experiment. Phase modulation property of the optical fiber sensor was discussed and the optimal working state was obtained by the computer simulation. The optical phase was modulated by the vibration of the reflector generated by the AE. The AE signals were obtained though the optoelectronic conversion, and the frequency of the AE were acquired by using Fourier transform. The experiment results show that the system could be used to detect the ultrasonic waves that propagating on the surface of the solid. The open loop Sagnac optical fiber interferometer sensor has potential for the structural integrity monitoring and NDT applications.
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Yijun Liang, Ming Wang, Junfeng Liu, Linlin Mu, "Open-loop Sagnac optical fiber sensor for detecting acoustic emission", Proc. SPIE 7382, International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging, 738214 (28 August 2009); doi: 10.1117/12.834823; https://doi.org/10.1117/12.834823
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