基于斯托克斯参量的光纤光栅微压力传感方法研究  

Anovel fiber Bragg grating sensor for weak pressure measurement based on the Stokes parameter

作　　者：彭晖 徐小来 邬书跃 PENG Hui;XU Xiao-lai;WU Shu-yue(Hunan Institute of Information Technology,Changsha,Hu-nan 410151,China)

机构地区：[1]湖南信息学院,湖南长沙410151

出　　处：《光电子．激光》2020年第10期1018-1024,共7页Journal of Optoelectronics·Laser

基　　金：湖南省教育厅科学研究项目(19B395)资助项目。

摘　　要：为了实现微压力的测量,提出了一种基于光纤光栅Stokes参量的微压力传感新方法,给出了理论分析和实验结果。在外界压力作用下,由于压力致双折射效应,光纤光栅两个线偏振光的能量输出发生变化,仿真结果表明,第一归一化Stokes参量s1峰值与压力在一定的测量范围内存在线性关系;另外为了减少波长抖动的影响并提高测量精度,文中提出了双波长检测法。在外界压力为0~5 N环境下,其压力灵敏度为0.0754/N,实验结果与理论分析结果吻合。In order to measure weak pressure,a novel sensor based on the Stokes parameter of FBG is proposed in this paper.The evolution of the first normalized Stokes parameter s1 with respect to pressure is studied theoretically and experimentally.A theoretical model for pressure sensing by use of the s1 is built and numerically simulation is also carried out.The dual-wavelength analytical method is proposed to reduce the influence of Bragg wavelength drift and improve the measurement accuracy.Under the pressure conditions of 0-5 N,the experimental pressure sensitivity is 0.0754/N.Good agreements between experiment results and numerical simulations verify thefeasibility ofthe method.

关 键 词：微压力 光纤光栅 Stokes参量 双波长检测 

分 类 号：TP2[自动化与计算机技术—检测技术与自动化装置]