Simulation and experimental study of a three-axis fiber Bragg grating accelerometer based on the pull-push mechanism

摘要

A three-axis fiber Bragg grating accelerometer, which has uniform sensitivities to three axes, has been developed for seismic application. This paper presents the design, simulation and calibration of the three-axis accelerometer. A series of experiments were performed to measure harmonic vibration and shock vibration. The precise acceleration was measured by a PZT accelerometer which provided high sensitivity. The fully described dynamic sensitivity of three-axis accelerometers represented by a 3-by-3 matrix is given. The results indicate that the accelerometer has a sensitivity of 0.068 V g~(-1) in a measured full scale of ± 2.5 m s~(-2). The cross-axis sensitivity was measured as -75.5 dB, -75.5 dB and -78.2 dB, respectively.