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16 November 2004 Demodulation and multiplexing of optical fiber EFPI sensors
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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.
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Junfeng Jiang, Tiegen Liu, Yimo Zhang, Lina Liu, Yunxin Wang, and Pin Long "Demodulation and multiplexing of optical fiber EFPI sensors", Proc. SPIE 5579, Photonics North 2004: Photonic Applications in Telecommunications, Sensors, Software, and Lasers, (16 November 2004);

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