混合Sagnac干涉仪高分辨率相位解调算法  

Phase Interrogation Algorithm with High Resolution for Hybrid Sagnac Interferometers

作　　者：刘硕[1] 杨远洪[1,2] 陈宇轩[1] 

机构地区：[1]北京航空航天大学精密光机电一体化技术教育部重点实验室,北京100191 [2]北京航空航天大学惯性技术国防科技重点实验室,北京100191

出　　处：《中国激光》2015年第10期160-164,共5页Chinese Journal of Lasers

基　　金：国家重大科学仪器设备开发专项(2013YQ04081504);创新团队发展计划(IRT 1203)

摘　　要：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。A phase interrogation algorithm with high resolution for the measurement of the polarization nonreciprocal phase-shift of hybrid Sagnac interferometers is proposed. Taking wavenumber instead of wavelength as the function variable, the output spectrum is a standard cosine spectrum function. The frequency, interference order and relative phase of this spectrum function can be obtained after Fourier transform and inverse Fourier transform. And then the measurement of the polarization nonreciprocal phase- shift of hybrid Sagnac interferometers can be realized with high resolution and a large rangement. A typical hybrid Sagnac interferometer based polarization maintaining fibrer（PMF） temperature sensor is built and the absolute phase is determined with proposed algorithm. Experiments show that less than 0.1 ℃ temperature resolution is realized and the temperatures from room temperature to 900 ℃ can be measured with a good linearity.

关 键 词：光纤光学 传感器 SAGNAC干涉仪 傅里叶变换 绝对相位解调 

分 类 号：TB133[机械工程—光学工程]