An in-fiber Michelson interferometer based on core mismatching for liquid refractive index sensing is proposed anddemonstrated. The sensor can be simply fabricated by fusion splicing a section of thinned core fiber (TCF) to a standardsingle mode fiber (SMF) without any reflection coating. The experimental results show that the sensor possesses RIsensitivity of -111.58 dB/RIU in the RI range of 1.333-1.380 RIU. The liquid temperature cross-sensitivity isexperimentally analyzed and reveals that the measurement error of the liquid RI caused by temperature is -0.89×10~(-6)RIU/°C in water temperature range of 25°C-80°C. The advantages of easy fabrication, high sensitivity, working onreflective intensity detection and compact size make the proposed sensor can offer promising applications in chemical,biomedical and petrochemical fields.
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机译：提出了一种基于用于液体折叠对液体折射率感测的纤维的迈克尔逊干涉仪展示。传感器可以通过融合将薄型芯光纤（TCF）的融合拼接到标准来制造单模光纤（SMF）没有任何反射涂层。实验结果表明，传感器具有RI敏感度为-111.58 db / riu在Ri范围内为1.333-1.380 Riu。液体温度交叉敏感性是通过实验分析并揭示由温度引起的液体RI的测量误差为-0.89×10〜（-6）RIU /°C水温范围为25°C-80°C。易于制造，高灵敏度，工作的优点反光强度检测和紧凑尺寸使得所提出的传感器可以在化学方面提供有希望的应用，生物医学和石化领域。
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