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Proceedings Paper

Demodulation and multiplexing of optical fiber EFPI sensors
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Paper Abstract

The optical fiber EFPI sensor with cavity length shorter than 20 µm is suited for structure health monitoring. The cavity length of EFPI is crucial measurand and usually obtained by low coherence interference method, but the coherence lengths of most laser source are greater than 20 µm, which lead to the overlapping of multiple interference fringes and failing to obtain cavity length. In this paper, a new demodulation method is proposed. The EFPI sensor of system is made with multimode fiber, the other part is monomode fiber, and a low coherence interference experiment setup with ASE light source, which avoids overlapping of different orders of low coherence interference fringes wave packet through reflectivity match, is established. A algorithm is developed for retrieving cavity length and a new method for multiplexing of EFPI sensors is presented. Experiments show that the cavity length of EFPI can be obtained efficiently and multiplexing is easily realized.

Paper Details

Date Published: 16 November 2004
PDF: 5 pages
Proc. SPIE 5579, Photonics North 2004: Photonic Applications in Telecommunications, Sensors, Software, and Lasers, (16 November 2004); doi: 10.1117/12.567360
Show Author Affiliations
Junfeng Jiang, Tianjin Univ. (China)
Tiegen Liu, Tianjin Univ. (China)
Yimo Zhang, Tianjin Univ. (China)
Lina Liu, Tianjin Univ. (China)
Yunxin Wang, Tianjin Univ. (China)
Pin Long, Tianjin Univ. (Canada)


Published in SPIE Proceedings Vol. 5579:
Photonics North 2004: Photonic Applications in Telecommunications, Sensors, Software, and Lasers
Donna Strickland; Trevor J. Hall; Stoyan Tanev; Xiaoyi Bao; Franko Kueppers; David V. Plant, Editor(s)

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