Research on Physical Parameter Measurement System of Fiber Fabry-Perot Interferometer

Fiber Fabry-Perot Interferometer (FFPI) is made of two well-cleaved fiber end faces with high-reflectivity, which is widely used in displacement sensing, pressure sensing, acoustic wave and ultrasonic detection. In this paper, we studied and verified the spectral relationship between the Interference spectrum and the fiber Fabry-Perot interferometer, in the case of gradual changing in physical parameters (Fabry cavity length), Furthermore, we used Matlab to fit the spectrum data, and analyzed the relationship between the physical parameters of the sensor and the spectral data from the optical spectrum analyzer (OSA). The actual cavity length was calculated from the measured data of the OSA. This fiber Fabry-Perot interferometer can be applied to the measurement of the length, displacement, and has a wide range of measurement applications due to its stability and durability.