光纤Bragg光栅应力传感中温度交叉敏感问题研究

Cross sensitivity of temperature in fiber Bragg grating strain sensing

针对光纤Bragg光栅应力传感中温度交叉敏感的问题,设计了一种有效的无源温度补偿方法和补偿结构。通过理论模拟,分析了M值不同时补偿效果曲线的变化,从中得到了补偿效果最好时的M值;得出了不同预应变情况下的温度特性曲线,从中找出了温度特性被完全补偿时的预应变的值;分析了温度补偿中出现过补偿和欠补偿现象的原因。通过该方法,有效地解决了光纤Bragg光栅传感中的温度交叉敏感问题。温度补偿后可以满足对光纤光栅温度稳定性要求较高的光纤传感、通信等领域的需要。

An effective method of passive temperature compensation was introduced and a compensation structure was designed to address the temperature cross sensitivity in the fiber Bragg grating （FBG） strain sensing. The curves of the compensation effect were analyzed with theoretical simulation in different M values. The optimized M value for compensation effect was obtained. The temperature curves in different pre-strains were obtained, the pre-strain value, which compensates the temperature completely, was found out. The phenomena of under- compensation and over-compensation were also analyzed. The temperature cross sensitivity existing in FBG sensing was effectively resolved via this method, and such temperature compensation can meet the demand of temperature stability in fiber sensing and communication.