基于光纤光栅偏振特性的温度、轴向应力不敏感的磁场测量方法

苏洋; 彭晖; 冯奎; 徐俊华; 李玉权

doi:doi:10.3788/cjl200936s2.0219

中国激光, 2009, 36 (s2): 219, 网络出版: 2009-12-30

基于光纤光栅偏振特性的温度、轴向应力不敏感的磁场测量方法

Magnetic Field Measurements Using Polarization Properties of Fiber Grating with Temperature and Axial Strain Insensitive

论文大纲

苏洋 ^1,*彭晖 ¹冯奎 ¹徐俊华 ²李玉权 ¹

作者单位

¹ 解放军理工大学通信工程学院光纤通信实验室,江苏南京 210007

² 济南军区72556部队13分队,山东济南 250000

摘要

提出了利用光纤光栅的偏振相关损耗(PDL)直接测量磁场的方法。利用耦合模理论进行了理论仿真,验证了在一定的测量范围内PDL峰值随外加磁场单调递增的关系。分析了光栅长度和折射率调制系数对磁场传感器测量范围和灵敏度的影响。利用相位掩模方法制作光纤布拉格光栅(FBG)进行实验测量,实验数据和理论吻合较好。同时对此方案的温度、轴向应力不敏感性进行了分析和实验验证,证明了温度和轴向应力不会对偏振特性产生影响,此方法可明显改善交叉敏感问题。

Abstract

A novel demodulation technique for magnetic field fiber Bragg gratings (FBG) sensors based on the monitoring of the polarization dependent loss (PDL) in transmission is presented. Theoretical simulations are realized using the coupled mode theory. It is shown that in certain range the PDL peak value increases with applied magnetic field monotonously. The effects of grating parameters on measurement range and sensitivity are analyzed. The experimental measurements are conducted on FBG inscribed by means of the phase mask technique. A good agreement between experimental and simulated evolutions is demonstrated. Owing to the polarization properties it is possible to obtain temperature and axial strain-insensitive measurements which is demonstrated by theoretical study and experimental measurements.

参考文献

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苏洋, 彭晖, 冯奎, 徐俊华, 李玉权. 基于光纤光栅偏振特性的温度、轴向应力不敏感的磁场测量方法[J]. 中国激光, 2009, 36(s2): 219. Su Yang, Peng Hui, Feng Kui, Xu Junhua, Li Yuquan. Magnetic Field Measurements Using Polarization Properties of Fiber Grating with Temperature and Axial Strain Insensitive[J]. Chinese Journal of Lasers, 2009, 36(s2): 219.

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