双M-Z型光纤微振动传感器光波随机偏振分析  

Random Polarization Effects on the Dual M-Z Fiber Optic Micro Vibration Sensor

作　　者：蓝天[1] 张春熹[1] 李立京[1] 罗光明[1] 李琛[1] 

机构地区：[1]北京航空航天大学仪器科学和光电工程学院,北京100083

出　　处：《压电与声光》2008年第5期541-543,共3页Piezoelectrics & Acoustooptics

摘　　要：对应用于分布式微振动传感的双M-Z型光纤传感器进行偏振分析,阐明光波偏振态随机变化导致时间差振动定位方法失效的原因。分析表明,光波偏振态随机变化引起两干涉输出的幅值波动,同时在两干涉输出间引入取值范围是-π~π的相位差,可使双M-Z型光纤传感器处于两个不同的工作点,造成同一相位调制产生两个不相关的干涉输出,导致基于信号相关的时间差振动定位方法失效。光路实验验证了理论分析的结果。The random polarization effects on the dual M-Z fiber optic micro vibration sensor was analyzed, and random polarization state resulting in the invalidation of time difference locating method was demonstrated. Random polarization state caused amplitude fluctuations of the two interferometric outputs and a -7rt^rt phase difference between the two interferometric outputs. The phase difference made the dual M-Z fiber optic sensor working on two different working points, therefore the same phase modulation could generate two uncorrelated interferometric outputs. This could invalidate the time difference locating method, which was based on signal correlation. The analysis results was verified experimentally.

关 键 词：光纤振动传感器 双M-Z干涉仪 偏振 时间差定位 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]