用于卫星次镜座结构的光纤光栅温度传感器设计

Design of Fiber Bragg Grating Temperature Sensor for Satellite Secondary Mirror Base Structure

摘要:

针对太空环境下在轨卫星内部次镜座结构的特殊性,为监测其温度状态,设计了一种金属基底的光纤光栅温度传感器来贴合次镜座使用。通过变换固定点距离,结合光纤温度传感原理以及弯曲栅区的应变状态,设计了结构小、质量轻且可同时多位置测量温度的基底结构。实验测试结果表明,该结构温度传感器中三个波段的线性度均达到了0.999,灵敏度分别为10.78,10.81和10.36pm/℃,同一温度下的中心波长波动在±3pm内,受外界应力影响较小,有良好的重复性。

Abstract:

In view of the particularity of the structure of the secondary mirror base in the space environment, it is necessary to monitor its temperature state, thus a FBG temperature sensor with metal base is designed for the application of satellite secondary mirror seat. By changing the distance of fixed points, combining the principle of optical fiber temperature sensing with the strain state of bent gate region, a substrate with small structure and light weight is designed, and also it can realize multi-position temperature measurement simultaneously. Experimental results show that the linearity of the temperature sensor reaches 0.999 in three bands, and the sensitivity is 10.78,10.81 and 10.36pm/℃ respectively for the three bands. The center wavelength of the sensor fluctuates within ±3pm at the same temperature, which is less affected by external stress and has good repeatability.