光纤布拉格光栅应变与温度传感特性及其实验分析

Theoretical and experimental studies on the strain and temperature sensing performance of optical FBG

对光纤布拉格光栅应变与温度传感特性进行了分析 ,理论计算了波长变化对传感系数的影响 ,提出了光纤光栅应变传感的温度补偿方法 ,并理论分析了光纤光栅温度和应变传感的耦合作用。最后 ,通过材料实验与等强度梁实验研究与分析了光纤光栅的应变与温度传感特性。理论分析与实验结果表明 ,两者吻合很好 ,光纤光栅的波长变化与应变和温度存在很好的线性关系 ,波长变化对传感系数的影响很小。

This paper has analyzed the performance of optical FBG's strain and temperature sensing, theoretically calculated central wavelength changes' influence on the coefficient of sensing, brought forward a method to eliminate the temperature's influence on FBG's strain sensing, and studied the coupling effects of FBG's strain and temperature sensing. The performance of optical FBG's strain and temperature sensing has also been studied through the experiment of materials and equal strength beam. The results from experiments and theoretical analyses show that they were consistent with each other, the wavelength changes were linear with the stain and temperature and that central wavelength changes have little effects on the coefficient of FBG's sensing.