干涉型分布式光纤传感系统抗偏振衰落性能研究

摘要

To solve the problem of polarization decline in the distributed optical fiber sensing system and to improve the stability of the system,this paper based on analyzing the principle of the detection system,this paper established the distributed optical fiber sensing system modeling, which was based or the equivalent Jones Matrix of the single model optical fiber model birefringence. It can clearthe relationship between the detection light intensity 1 and incidence polarization angle i by using different reflective device. The field test shows that the system has strong anti-fading characteristics of polarization by installing the FRM which rotation angle is π/2.%为了解决分布式光纤传感系统中常出现的偏振衰落现象,提高系统的稳定性,在分析了系统检测原理基础之上,基于单模光纤的双折射等效琼斯矩阵,建立了分布式光纤传感系统模型,明确了采用不同反射器件条件下,探测光强I与入射光偏振角度i的关系.通过试验证明系统采用旋转角为π/2的法拉第旋转镜(FRM)具有较好的抗偏振衰落特性.