Abstract
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.
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