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20 December 2004 Acoustic emission sensor based on a tapered single-mode fiber
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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.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Wu Kuang, Sa Ying Dong D.V.M., Min Zhang, and 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);

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