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Published on: February 25, 2017
Analysis of phase response of fiber Fabry-Pérot cavity microphones
Jin Cheng1, Baokai Ren1, Longjiang Zhao2
1Research Center for Sensor Technology, School of Applied Sciences, Mechanical Electrical Engineering School, Beijing Information Science and Technology University, Jianxiangqiao Campus, Beijing 100101, China.
Abstract:
In this paper, the phase response of fiber Fabry-Pérot cavity-based fiber optic microphones (FFPC-FOMs) is discussed through an analysis of the results of simulation and experiments. The phase difference of FFPC-FOMs mainly originates from two aspects: different phase lags of the mechanical-acoustic systems and different quadrature working points (Q*) on interference curves. The former is analyzed by an impedance-type analogous circuit, and the simulation results reveal that the change in cavity length and resonance frequency in a large range have an insignificant influence on the phase difference. The latter shows a unique effect on the phase difference and causes the phase of FFPC-FOMs to be either in or out of phase. The phase differences of four samples of FFPC-FOMs with different cavity lengths and resonance frequencies are measured in the frequency range 50 Hz-4 kHz. Experimental results of the phase difference are well consistent with simulation results. All samples of FFPC-FOMs can be divided into two groups: one is near 0° and the other is near 180°. In addition, the FFPC-FOMs in each group have good phase consistency for the array applications.
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