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Indexed by:期刊论文

Date of Publication:2019-03-15

Journal:IEEE SENSORS JOURNAL

Included Journals:SCIE、EI

Volume:19

Issue:6

Page Number:2162-2169

ISSN No.:1530-437X

Key Words:Fabry-Perot interferometer; simultaneous measurement; tilt angle; vibration acceleration; pendulum

Abstract:A fiber-optic Fabry-Perot (F-P) sensor, based on a pendulum structure, for simultaneous measurement of tilt angle and vibration acceleration was proposed, which also has a high tilt angle resolution. The real-time cavity lengths are absolutely measured using a fast demodulation algorithm. The tilt angle is estimated from the mean value of the real-time cavity lengths while the vibration acceleration derives from the alternating quantity of them. A series of experiments are conducted using a micro-tilt platform and a vibration table to simulate tilt angle change and the vibration perturbation, respectively. The experimental results show a tilt angle resolution of 0.023" in the measurement range from -2.8 degrees to 2.6 degrees. Meanwhile, the vibration acceleration results are obtained by using a spectral analysis to the alternating quantity and basing on a non-linear fitting curve of the frequency response of the acceleration sensibility, within the frequency range of 0 similar to 180 Hz.