An approach for suppressing the abrupt half the wavelength errors in case of spectral interferometric interrogation of optical fiber sensors is proposed. The approach was derived from theoretical analysis of least-squares fitting of interference signal and is based on estimating the additional phase shift in the interference scheme. The approach was experimentally validated through estimation of the Gouy phase in an extrinsic Fabry-Perot interferometer and eliminating abrupt half the wavelength errors which took place when the interferometer was simultaneously heated and bent. The proposed signal processing approach can be applied for increasing sensing resolution and robustness of low-cost fiber-optic interferometric sensors, paving the way for their wide-spread use.

中文翻译：

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光谱干涉测量中的突然 λ/2 解调误差：起源和抑制

提出了一种在光纤传感器的光谱干涉询问情况下抑制突然一半波长误差的方法。该方法源自对干涉信号最小二乘拟合的理论分析，并基于估计干涉方案中的附加相移。通过估计外在法布里-珀罗干涉仪中的古伊相位并消除干涉仪同时加热和弯曲时发生的突然一半的波长误差，对该方法进行了实验验证。所提出的信号处理方法可用于提高低成本光纤干涉传感器的传感分辨率和鲁棒性，为其广泛使用铺平道路。