An Active Temperature Compensated Fiber-Optic Fabry–Perot Accelerometer System for Simultaneous Measurement of Vibration and Temperature

In this paper, the principle of an active temperature compensated fiber-optic Fabry-Perot accelerometer (FOFPA) system for simultaneous measurement of vibration and temperature is described and experimentally demonstrated. The FOFPA is formed by bonding an all-silica in-line fiber Fabry-Perot etalon to one surface of the triangular cantilever with the lumped mass at the free end for acceleration measurement, and the laser wavelength is feedback controlled with proportional-integral-derivative algorithm for temperature compensation to realize the simultaneous measurement of vibration and temperature. The research results indicate that: 1) the FOPFA system shows a good nonlinearity of about 1.03% with phase sensitivity of about 0.051 rad/g for acceleration measurement; 2) the nonlinearity and sensitivity between the laser wavelength and the operating temperature are about 0.4% and 34.3 pm/ ^°C, respectively; and 3) the standard deviation of the phase sensitivity over the temperature range of 30^°C -90^°C is about 0.002 rad/g.