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Proceedings Paper

Acoustic emission sensor based on a tapered single-mode fiber
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Paper 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.

Paper Details

Date Published: 20 December 2004
PDF: 5 pages
Proc. SPIE 5577, Photonics North 2004: Optical Components and Devices, (20 December 2004); doi: 10.1117/12.567369
Show Author Affiliations
Wu Kuang, Tsinghua Univ. (China)
Sa Ying Dong D.V.M., Tsinghua Univ. (China)
Min Zhang, Tsinghua Univ. (China)
Yan Biao Liao, Tsinghua Univ. (China)

Published in SPIE Proceedings Vol. 5577:
Photonics North 2004: Optical Components and Devices
John C. Armitage; Simon Fafard; Roger A. Lessard; George A. Lampropoulos, Editor(s)

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