27 April 2009 Temperature-independent strain sensor based on a core-offset multimode fiber interferometer
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A novel temperature-independent multi-mode fiber (MMF) lateral strain sensor based on a core-offset interferometer is presented and demonstrated experimentally. Slightly misaligning a splice between an MMF and a single-mode fiber (SMF), high extinction ratio of the interferometer based on SMF-MMF-SMF structure can be obtained. When the lateral strain is applied to a short section of the MMF, the extinction ratio of the interferometer will decrease accordingly while the interference phase remains almost constant. Temperature variation only leads to shift in the transmission power spectrum of the interferometer and does not affect the extinction ratio. Experimental results show that there is a good quadratic relationship between the lateral strain and the extinction ratio. The proposed strain sensor has the advantages of temperature-independency, high extinction ratio sensitivity, good repeatability, low cost, and simplicity in structure.
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Bo Dong, Bo Dong, Li Wei, Li Wei, Da-Peng Zhou, Da-Peng Zhou, Wing-Ki Liu, Wing-Ki Liu, John W. Y. Lit, John W. Y. Lit, } "Temperature-independent strain sensor based on a core-offset multimode fiber interferometer", Proc. SPIE 7316, Fiber Optic Sensors and Applications VI, 73160T (27 April 2009); doi: 10.1117/12.818903; https://doi.org/10.1117/12.818903

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