Core mismatching based in-fiber Michelson interferometer for liquid refractive index sensing

Liang Han; Min Shao; Haonan Sun; Yinggang Liu; Xueguang Qiao

doi:10.1117/12.2537306

19 November 2019 Core mismatching based in-fiber Michelson interferometer for liquid refractive index sensing

Liang Han, Min Shao, Haonan Sun, Yinggang Liu, Xueguang Qiao

Proceedings Volume 11185, Optical Design and Testing IX; 1118510 (2019) https://doi.org/10.1117/12.2537306
Event: SPIE/COS Photonics Asia, 2019, Hangzhou, China

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.

Citation Download Citation

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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