A miniature hybrid FPI-FBG optical fiber sensor based was proposed to measure refractive index (RI) and temperature simultaneously. The integrated FPI-FBG composite fiber sensor is constructed by cascading an FP interference cavity at one end of the FBG, where the FPI is used to measure the liquid refractive index and the FBG to measure temperature and compensate for FPI. In this paper, Monte Carlo method is used to simulate the sputtering yield of three commonly used metal high reflection films (aluminum, silver and gold). Au film perform as the reflective mirror of the FPI due to its high sputtering yield and high stability. Owing to the different sensitivities, two-dimensional matrix method was constructed to calculating the refractive index (RI) and temperature synchronously. Experimental results show that the temperature and RI sensitivity of spectral dip wavelength for FPI are 0.338 nm/°C and 1669.5 nm/RIU, respectively. The FBG is insensitive to RI and temperature sensitivity of sensor is 9.8 pm/°C.
In this paper, a high sensitivity optic fiber flow sensor with a pair of FBG encapsulated by the elastic diagram is presented. Two FBGs were used to measure the strain and ambient temperature, and for the temperature compensation meanwhile. High sensitivity elastic diaphragms of various materials can be produced by 3D printing. The sensitivity of this kind of stainless sensor can reach 18.59pm/με. The sensor is suitable for the measurement of viscous liquids such as oil and is expected to be used in engineering monitoring in the future.
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