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Advances in Materials Science and Engineering
Volume 2013, Article ID 545013, 4 pages
http://dx.doi.org/10.1155/2013/545013
Research Article

Fiber Optic Vibration Sensor Based on the Tilted Fiber Bragg Grating

Institute of Optoelectronic Technology, China Jiliang University, Xueyuan Street, Xiasha Higher Education Zone, Hangzhou 310018, China

Received 22 May 2013; Revised 17 July 2013; Accepted 30 July 2013

Academic Editor: Xinyong Dong

Copyright © 2013 Jiali An et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A temperature-insensitive fiber optic vibration sensor based on the tilted fiber Bragg grating (TFBG) is presented. The sensing head is formed by insertion of a small section of MMF between a single-mode fiber and the TFBG. The reflection light from this tilted fiber Bragg grating includes two parts: the reflected Bragg mode and the cladding modes. The cladding modes were coupled back into the core mode as a function of the multimode fiber. The power of the cladding modes is sensitive to vibration, so the external vibration measurement can be obtained through the cladding mode average output power. Experiment results show that the root mean square (RMS) of the detection error of the average power was 0.01 μW within the temperature range from 20 to 70°C, so it is proved to be temperature independent; its frequency response has been tested to 1 KHz.