干涉型光纤传感器及阵列的分集消偏振衰落技术的研究与改进  

Development of an Interferometric Fiber-Optic Sensor and Its Array′s Divide/Combine Polarization-Induced-Fading Eliminated Technique

作　　者：沈梁[1] 叶险峰[1] 李志能[1] 

机构地区：[1]浙江大学信息与电子工程学系,杭州310027

出　　处：《传感技术学报》2001年第1期1-7,共7页Chinese Journal of Sensors and Actuators

基　　金：国家自然科学基金重点项目!( 6970 2 0 0 3)

摘　　要：对干涉型光纤传感器的分集检测消偏振衰落技术进行了新的理论分析 ,提出了将各路信号平方后相加的信号处理方式 ,使之能实现单元及阵列的实时消偏振衰落信号检测 .通过理论计算 ,可以使干涉信号幅度波动小于 9.5d B,并得出三路检偏是分集检测的最简取值的结论 ,通过自动增益控制电路 ,能够在信噪比有所降低的情况下消除偏振衰落的影响 ,实现干涉型光纤传感器的消偏振衰落 。A new theoretical analysis is given to the divide/combine polarization induced fading eliminated technique of an interferometric fiber optic sensor and its array, and a new way is proposed to realize the real time detection of the divide/combine method by squaring each signal and adding them together. The maximum amplitude fluctuation of this method is calculated, and the conclusion is drawn that three is the best number of analysis. By adding an electronic automatic gain control circuit, the signal fading is recovered at the expense of a relevant signal/noise ration degradation, and the application of the method in the interferometric array is designed.

关 键 词：光纤干涉仪 光偏振态 分集检测 光纤传感器 分集消偏振衰落技术 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]