20 December 2004 Acoustic emission sensor based on a tapered single-mode fiber
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Abstract
This paper reports, on the use of a tapered single mode fiber as a sensing element for the detection of acoustic emission (AE) and ultrasound. When an acoustic wave impinges on the mode-coupling region of a fiber, the coupling coefficient is modulated via the photo-elastic effect. Therefore, the transfer function of the fiber is modulated by an acoustic wave. The sensitivity of the sensor at 156 kHz was approximately 1.2 V/mbar. Because of the resonant condition of the coupled-mode theory, this sensor is almost immunity of the environment perturbations, and the output is a DC signal instead of AC, so it is very suitable for those situations such as faulty protection which need very fast responsibilities.
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Wu Kuang, Wu Kuang, Sa Ying Dong, Sa Ying Dong, Min Zhang, Min Zhang, Yan Biao Liao, Yan Biao Liao, } "Acoustic emission sensor based on a tapered single-mode fiber", Proc. SPIE 5577, Photonics North 2004: Optical Components and Devices, (20 December 2004); doi: 10.1117/12.567369; https://doi.org/10.1117/12.567369
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