预紧封装光纤光栅温度传感器传感特性研究
Sensing Properties of Fiber Grating Temperature Sensor Package Preload

为了获得稳定测量温度变化的光纤光栅温度传感器，笔者研究带预紧力的光纤光栅温度传感器的封装技术及其传感特性。通过温度传感理论分析，在避免光纤光栅对温度和应变的交叉敏感情况下，对光纤光栅温度传感器进行有限元Ansys应力分布进行模拟，可知本封装具有一定的减敏作用，温度测量量程增大，满足更多实际工程中的使用。环氧树脂DP420将带有预紧力光纤光栅封装在铍青铜材料的圆柱体内，在恒温鼓风干燥箱对光纤光栅温度传感器进行传感特性研究，40～120 ℃的范围内，每次升温5 ℃。所得结果，此光纤光栅温度传感器的温度灵敏度系数为23.81 pm/℃，是裸光纤光栅传感器的2倍，且线性度达0.999以上。 该文对光纤光栅工程化具有较大的应用价值。
In order to obtain a stable measurement of temperature changes and improve the characteristics of a FBG temperature sensor, the packaging technology and sensing properties of fiber grating temperature sensors with preload were studied. Theoretical temperature sensing and stress distribution on the optical fiber grating temperature sensor were analyzed using finite element simulation, and the cross-sensitivity between temperature and fiber grating strain was solved. This package has certain desensitization and a greater range of temperature measurement. The epoxy DP420 adheres fiber grating with preload to the cylinder with beryllium copper material. The sensing properties of the FBG temperature sensor in the oven were studied in a constant temperature blast from 40℃ to 120℃ at intervals of 5℃. The experimental results showed that the temperature sensitivity coefficient of the optical fiber grating temperature sensor was 23.81 pm/℃, which was two times that of the bare FBG sensors, with linearity greater than 0.999.