为了实现对布拉格光纤光栅的温度补偿,提出了一种新的热应力温度补偿机制。设计并制造了一种新型的、采用在线成型工艺的光纤光栅温度自补偿应变传感器,该传感器不仅具有温度补偿功能,而且可以实现应变增敏,解决了管式封装胶粘不牢、胶层老化、以及温度补偿的传感器不能测量应变的问题。实验结果表明,在-20~40 ℃,该传感器实现了良好的温度补偿和应变增敏效果。在实验温度范围内,光栅传感器的波长基本保持不变;应变敏感性为1.69 pm/με,是原来的1.4倍,与理论计算值吻合得很好。该传感器通过单光栅来实现温度补偿功能,并且能够测量应变,解决了光栅传感器现存的一些关键问题。

To eliminate the temperature effect of Fiber Bragg Gratings(FBGs),a new thermal stress compensation mechanism and an online-forming technology are presented to design and manufacture a novel FBG strain sensor. The sensor can not only compensate temperature drifts,but also can enhance the stain sensitivity,so the weak adhesion and glue aging in packaging processing is improved. Especially,the sensor can be used in the stress measurement that can not be realized by traditional temperature compensating sensors. The experimental results indicate that the sensor provides good abilities of temperature compensation and strain sensitivity in 20-40 ℃. In measurement ranges,it shows a near zero shift and a high strain sensitivity of 1.69 pm,which is 1.4 times that of bare FBGs in the proposed self-compensated package and is coincident with the theoretical calculation well. These results prove that the sensor resolves some difficulties existed in optical fiber sensing fields,for it has temperature compensated functions and strain-testing functions simultaneously.