夹持式温度自补偿光纤布拉格光栅应变传感测试技术

Strain Sensing Measurement Technology for Fiber Bragg Grating with Holder Type Temperature Self-Compensation

鉴于光纤布拉格光栅(FBG)应变测试时对应变和温度交叉敏感的特性,将温度补偿FBG结构与应变FBG结构串联,采用夹持式封装方式,根据温度FBG和应变FBG相对波长的变化确定被测结构的应变量。实验结果表明:温度FBG和应变FBG相对波长变化对温度的灵敏度仅为0.12pm·℃-1,为温度FBG和应变FBG温度灵敏度的1.14%和1.15%;并实现了应变FBG测量的温度自补偿。夹持式温度自补偿FBG应变传感测试技术原理简单,实用性强,可被广泛应用于实际工程中。

In view of the characteristics of cross-sensitivity between strain and temperature of fiber Bragg grating （FBG）, the temperature-compensation FBG structure is in series with strain FBG structure based on holder type packaging. The structure strain can be acquired by the relative wavelength shift between temperature FBG and strain FBG. The experimental results indicate that temperature sensitivity induced by relative wavelength shift is only 0.12 pm·C^-1, which is 1.14% and 1.15% of temperature sensitivity of temperature FBG and strain FBG. The FBG strain measurement possesses good performances on temperature compensation. The principle of FBG strain sensing measurement technology with holder type temperature compensation is simple, and the operation is convenient. It can be applied widely to practical engineering.