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Proceedings Paper

Extrinsic Fabry-Perot interferometric sensor using a polarization-switched phase interrogator
Author(s): Ji Xia; Fuyin Wang; Yangyang Yang; Shuidong Xiong; Hong Luo; Wenjian Wei
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Paper Abstract

In this paper, a phase variation tracking method for the extrinsic Fabry-Perot interferometric (EFPI) voice sensing system is designed and experimentally demonstrated through a polarization-switched unit based on the combination of polarization-maintaining fiber Bragg grating (PMFBG). The measurements at two operation wavelengths are firstly achieved in one total-optical path, which eliminates the imbalance of optical power from the external disturbances, optical source fluctuation, different detecting response of photoelectric detector and different background noise. Two operation wavelengths reflected from a PMFBG for interference phase tracking are switched via an electro-optic modulator at a high switching speed of 10 kHz. Besides, an ellipse fitting-differential cross multiplication (EF-DCM) algorithm is proposed and illustrated for interrogating the variation of EFPI cavity gap length of the EFPI voice sensor effectively. Preliminary experimental results have proven that the polarization-switched system based on the EF-DCM algorithm could find potential applications in the fields of marine acoustic, medical science measurements, etc.

Paper Details

Date Published: 19 October 2016
PDF: 8 pages
Proc. SPIE 10155, Optical Measurement Technology and Instrumentation, 1015532 (19 October 2016); doi: 10.1117/12.2247310
Show Author Affiliations
Ji Xia, National Univ. of Defense Technology (China)
Fuyin Wang, National Univ. of Defense Technology (China)
Yangyang Yang, National Univ. of Defense Technology (China)
Shuidong Xiong, National Univ. of Defense Technology (China)
Hong Luo, National Univ. of Defense Technology (China)
Wenjian Wei, National Univ. of Defense Technology (China)

Published in SPIE Proceedings Vol. 10155:
Optical Measurement Technology and Instrumentation
Sen Han; JiuBin Tan, Editor(s)

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