应力和温度同时测量的光纤布拉格光栅双参数传感器

Fiber Bragg Grating for Simultaneous Measurement of Strain and Temperature

为解决光纤布拉格光栅（FBG）传感器温度和应力交叉敏感问题，研究了一种FBG双参数传感器。基于FBG测温、应力测量的基本原理，分析了FBG双参数传感器的工作原理。对设计的FBG双参数传感器进行了实验研究，得到了双参数传感器的温度及应力测量线性度及响应灵敏度，并给出了温度及应力两个参数共同作用下去除交叉敏感测量结果。测温光栅动态范围0℃～100℃，响应灵敏度为12．2pm／℃；封装后应力响应灵敏度为1．79pm／N。研究结果表明，在FBG应力测量过程中，该方法不仅可以有效去除温度交叉敏感问题，同时还可以实现温度及应力两种参数的准确测量。

In order to avoid cross-sensitive connection of temperature and strain in fiber grating sensing system, one dual-parameter sensor employing fiber Bragg grating （FBG） is investigated. Based on theories of temperature and strain testing using FBG, the operating principle of the dual-parameter sensor is described. The experiment on the dual-parameter sensor is performed for linearity and sensitivity of temperature and strain, and measurement results combined effects of strain and temperature loading are described. Dynamic range and sensitivity of temperature FBG are about 0 ℃ -100 ℃ and 12.2 pm/℃, for strain FBG about 1.79 pm/N. The experimental results show that this method can eliminate availably cross-sensitivity of temperature and strain for strain FBG sensor, and measure temperature and strain accurately and synchronously.