光纤环镜在光栅传感解调系统中的应用  

Application of fiber loop mirror to demodulation system of fiber grating sensor

作　　者：张锦龙[1,2] 王葵如[1] 余重秀[1] 林妹妹[1] 赵德新[1] 李成[1] 

机构地区：[1]北京邮电大学电子工程学院教育部光通信与光波技术重点实验室,北京100876 [2]河南大学物理与电子学院,河南开封475001

出　　处：《光学精密工程》2009年第5期943-950,共8页Optics and Precision Engineering

基　　金：国家自然科学基金资助项目(No.60677003)

摘　　要：为实现高稳定性、高精度的波长干涉解调,研究了保偏光纤环镜在波长解调结构中的应用,设计并搭建了一种基于光纤环镜的新型光纤布拉格光栅传感器解调系统。依据传统的矩阵光学原理建立理论模型,分析采用保偏光纤环镜实现干涉解调的基本原理,研究了其结构参数对解调精度的影响并进行数值仿真验证。在理论指导的基础上,搭建光路模块,并基于LabVIEW软件设计了用于消除系统结构参数误差的测定软件与解调系统监控软件,研制电路模块,构成了完整的传感解调系统。经传感检测验证,该系统在20~90℃对温度的分辨率为0.03℃,准确度可达±0.1℃,实验结果与理论分析相吻合,展示了该系统具有良好的稳定性,较高的检测灵敏度和较强的适用性。A novel demodulation scheme for the fiber Bragg grating sensor based on a new-pattern po- larization-maintaining fiber loop mirror is designed to achieve highly stable and accurate wavelength interference demodulation. Based on the matrix optics theory, a model is established for analyzing the elementary principle of the interference demodulation using this fiber loop mirror. Then, the influence of structure parameters on the demodulation precision is deeply analyzed, and a numerical simulation is undertaken. Meanwhile, the optical and electrical modules are developed, and the testing software and monitoring software are designed for eliminating the system structure errors based on LabVIEW. By a sensor detection experiment, the system precision on temperature in the range of 20-90 ℃ can reach the resolution of 0.03℃ and the accuracy of ±0.1℃. The experimental results agree well with theory analysis, which sufficiently shows that this system has advantages in favorable stabilization, much higher precision and stronger applicability.

关 键 词：光纤传感 光纤环镜 解调系统 LABVIEW 

分 类 号：TN253[电子电信—物理电子学]