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为实现混合Sagnac干涉仪中偏振非互易相移的检测,提出了一种高分辨率的相位解调算法。该算法中,利用波数代替波长作为输出光谱的自变量,使输出光谱转化为标准的余弦函数,进行傅里叶变换和傅里叶逆变换,计算出干涉谱的频率、干涉级次和相对相位,实现了Sagnac干涉仪中偏振非互易相移的大范围、高分辨率解调。搭建了基于混合Sagnac干涉仪的保偏光纤温度传感器,进行了实验和相位解调研究,实验结果表明该算法可实现优于0.1℃的温度分辨率,并能实现室温到900℃范围温度的线性测量。
In order to realize the detection of polarization nonreciprocal phase shift in the hybrid Sagnac interferometer, a high resolution phase demodulation algorithm is proposed. In this algorithm, the wavenumber is used as an independent variable of the output spectrum instead of the wavelength, the output spectrum is transformed into a standard cosine function, and the Fourier transform and the inverse Fourier transform are used to calculate the interference spectrum frequency, the interference order and the relative phase , A large-scale, high-resolution demodulation of the polarization non-reciprocal phase shift in the Sagnac interferometer has been achieved. A polarization maintaining optical fiber temperature sensor based on a hybrid Sagnac interferometer was built and experimental and phase demodulation studies were carried out. The experimental results show that the proposed algorithm can achieve temperature resolution better than 0.1 ℃ and linearity of temperature from room temperature to 900 ℃ measuring.