温度对光纤布拉格光栅传感器应变传递率影响的试验研究

Experimental Study on the Effect of Temperature on Strain Transmissibility of Fiber Grating Sensors

多数学者利用光纤布拉格光栅(Fiber Bragg Grating,FBG)传感器研究应变传递率时,通常忽略温度对胶黏剂的影响,而胶粘剂在不同温度条件下的剪切模量不同,必然对应变测量所得出的结果造成影响。本文经过在恒温箱内等强度梁标定试验发现,同一FBG传感器在不同环境温度下标定得到的应变传递率不同,发现主要是温度对胶黏剂剪切模量影响造成的。通过应变传递率曲线分析得到,在其他条件相同下,同一等强度梁应变传递率随温度先升高后下降。

Most researchers using fiber Bragg grating(Fiber Bragg Grating,FBG)sensor Strain transmissibility,typically ignore the impact of temperature on the adhesive,the adhesive shear modulus is different at different temperatures,it will inevitably affect the results obtained by the strain measurement.In this paper,the calibration test of a beam of equal strength in a constant temperature box shows that the same FBG sensor has different strain transfer rates when calibrated at different ambient temperatures.It is found that the temperature is mainly caused by the influence of the temperature on the shear modulus of the adhesive.Through the analysis of the strain transfer rate curve,under the same other conditions,the strain transfer rate of the same equal-strength beam first increases and then decreases with the temperature.