Phase Compensation Scheme for Fiber-Optic Interferometric Vibration Demodulation

In order to expand the dynamic range of fiberoptic interferometric demodulation, a novel phase compensation scheme based on the phase generated carrier arctangent algorithm (PGC-arctan) is proposed, which overcomes the limitation of the amplitude range from -pi/2 to pi/2 for arbitrary signals; and a Michelson interferometer measurement system is established to verify the rationality of the compensation algorithm. The phase compensation algorithm is based on analysis of the instantaneous function of the arctangent signal during the phase hopping process, while overcoming the problem of phase winding. Experimental results confirmed the feasibility of the phase compensation scheme as predicted by theoretical and simulation analysis. In particular, the new scheme was shown to be effective in responding to arbitrary large-amplitude and time-dependent vibrational input, with the additional benefit of a strong ability to suppress system and ambient noise.