Biaxial Optical Accelerometer and High-Angle Inclinometer With Temperature and Cross-Axis Insensitivity

摘要

In this paper, we describe the implementation and test of an optical fiber biaxial accelerometer and inclinometer based on fiber Bragg gratings. The proposed sensor is a low cost and simple solution to measure acceleration and relative rotation in two orthogonal directions, which can be used for structural health monitoring. Sensitivities of 87.848 and 92.351 ${rm pm}{cdot}{rm g}^{-1}$, for each sensitive direction with resonant frequencies of 846.01 and 845.33 Hz, respectively, are achieved. For the inclinometer, the tilt sensitivities are $1.43pm 0.03$ and $1.38pm 0.03~{rm pm}/^{circ}$ for each orthogonal sensitive direction for angular rotations smaller than 45$^{circ}$. For inclinations higher than 45$^{circ}$, a suitable calibration expression is presented.