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Proceedings Paper

Novel acoustic emission sensor system based on two cascaded phase-shifted fiber Bragg gratings
Author(s): Qi Wu; Yoji Okabe
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Paper Abstract

A novel acoustic emission (AE) sensor system based on fiber Bragg grating is proposed. Two identical phase-shifted FBGs (PS-FBGs) are cascaded after an amplified spontaneous emission (ASE) source, used as filter and sensor respectively. By measuring the change of the output power, the AE signal and low frequency vibration can be detected. Because of the sharp peak in the middle of the PS-FBG spectrum due to the phase shift, the sensitivity of the system is guaranteed while preventing the photo-detector from saturation. The proposed system has the advantages of simple configuration, no-resonance, electromagnetic interference immunity and low cost.

Paper Details

Date Published: 17 October 2012
PDF: 4 pages
Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 84214H (17 October 2012); doi: 10.1117/12.974465
Show Author Affiliations
Qi Wu, Univ. of Tokyo (Japan)
Yoji Okabe, Univ. of Tokyo (Japan)

Published in SPIE Proceedings Vol. 8421:
OFS2012 22nd International Conference on Optical Fiber Sensors
Yanbiao Liao; Wei Jin; David D. Sampson; Ryozo Yamauchi; Youngjoo Chung; Kentaro Nakamura; Yunjiang Rao, Editor(s)

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