一种利用激光拍频实现应力测量的传感装置  

A Stress Fiber Sensor Based on Laser Beat Frequency

作　　者：王旭[1] 张豪杰[1] 温泉[1] 陈龙飞[1] 王芳[1] 刘玉芳[1] 

机构地区：[1]河南师范大学物理与电子工程学院,河南新乡453007

出　　处：《中国激光》2016年第8期90-94,共5页Chinese Journal of Lasers

基　　金：国家自然科学基金(61307122;61475043);河南省基础和先进技术研究项目(142102210450);研究生科研创新项目(YL201404)

摘　　要：结合线性啁啾光纤布拉格光栅(CFBG),设计了一种基于激光拍频实现应力测量的传感装置。系统采用CFBG的时延改变谐振腔的腔长的方法,把波长变化转化为腔长变化,不同于以往改变腔长的方法,达到波长解调实现传感测量的目的。对线性CFBG的时延谱进行了测量,并对系统结构和测量原理进行了详细的阐述,对测量结果和精确度也进行了分析与计算。谐振腔长变化可达到6.2cm,腔长变化值与腔长比达到2.55%,使应力测量精度可以提高到10^(-7)N。Combining the characteristics of linear chirped fiber Bragg grating （CFBG）, a stress fiber sensor based on laser beat frequency is designed. Using the method of CFBG converting the wavelength change into the length change of resonant cavity, the wavelength demodulation is achieved. The proposed method is different from previous methods changing the cavity length. The group delay of linear CFBG is measured and the system structure and principle are described in detail. Besides, the measuremental results and precision are analyzed and calculated. The length change of cavity can reach 6.2 cm, which accounts for 2.55% of total cavity length. The results show that the strain measurement precision can be up to 10 ^-7 N.

关 键 词：光纤光学 应力 拍频 啁啾光纤布拉格光栅 

分 类 号：O437.1[机械工程—光学工程]