A miniature fiber-optic Fabry-Perot interferometer (MOFPI) fabricated by splicing a\nhollow silica tube (HST) with inner diameter of 4 m to the end of a single-mode fiber is investigated\nand experimentally demonstrated. The theoretical relationship between the free spectrum range and\nthe length of HST is verified by fabricating several MOFPIs with different lengths. We characterize\nthe MOFPIs for temperature, liquid refractive index, and strain. Experimental results show that the\nsensitivities of the temperature, liquid refractive index, and strain are 16.42 pm
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