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

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4 Author(s)
Antunes, P.F.C. ; Dept. de Fis., Univ. of Aveiro, Aveiro, Portugal ; Marques, C.A. ; Varum, H. ; Andre, P.S.

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 pm.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 1.43 ± 0.03 and 1.38 ± 0.03 pm/o for each orthogonal sensitive direction for angular rotations smaller than 45°. For inclinations higher than 45°, a suitable calibration expression is presented.

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Sensors Journal, IEEE  (Volume:12 ,  Issue: 7 )