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19 November 2019 Core mismatching based in-fiber Michelson interferometer for liquid refractive index sensing
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Abstract
An in-fiber Michelson interferometer based on core mismatching for liquid refractive index sensing is proposed and demonstrated. The sensor can be simply fabricated by fusion splicing a section of thinned core fiber (TCF) to a standard single mode fiber (SMF) without any reflection coating. The experimental results show that the sensor possesses RI sensitivity of -111.58 dB/RIU in the RI range of 1.333-1.380 RIU. The liquid temperature cross-sensitivity is experimentally analyzed and reveals that the measurement error of the liquid RI caused by temperature is -0.89×10-6 RIU/℃ in water temperature range of 25℃-80℃. The advantages of easy fabrication, high sensitivity, working on reflective intensity detection and compact size make the proposed sensor can offer promising applications in chemical, biomedical and petrochemical fields.
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Liang Han, Min Shao, Haonan Sun, Yinggang Liu, and Xueguang Qiao "Core mismatching based in-fiber Michelson interferometer for liquid refractive index sensing", Proc. SPIE 11185, Optical Design and Testing IX, 1118510 (19 November 2019); https://doi.org/10.1117/12.2537306
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