Open AccessQuadrature phase detection based on an extrinsic Fabry–Pérot interferometer for vibration measurement
Author(s) -
Zihua Zhang,
Chunlei Jiang,
Fuli Wang,
Zhen Huang,
Liqun Shen,
Chengwei Li
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.403913
Subject(s) - fabry–pérot interferometer , interferometry , optics , quadrature (astronomy) , demodulation , vibration , physics , optical fiber , signal (programming language) , acoustics , computer science , telecommunications , laser , channel (broadcasting) , programming language
A novel vibration measurement system based on a fiber-optic extrinsic Fabry-Pérot interferometer is established. Two quadrature interferometry signals are obtained in accordance with the 90° phase shift between two output arms of a 2×2 fiber coupler. This outcome drastically simplifies the processing of collected data because only a single arctangent operation is needed to calculate the wrapped phase. Repetitive test results show that the relative micro-vibration reconstruction error of this method is less than 0.12%. This structure simplifies the extrinsic Fabry-Pérot signal demodulation process, which has guiding significance for the online measurement of high-precision physical quantities.