光纤光栅传感器民机机载环境适应性分析方法

严苛的机载环境条件严重影响着光纤光栅应变传感器在民机结构状态监测中的长期应用,为了评价光纤光栅应变传感器的机载环境适应性,从机载环境条件出发,提出以传感特性的灵敏度系数、线性度、零点漂移、温度系数作为评价光纤光栅应变传感器环境适应性的指标体系,设计了环境试验前后基于等强度梁的传感器有效性测试方法,分别采用涂层封装与非金属基底封装两种封装形式的光纤光栅传感器,经历14项环境试验后暴露其存在问题对环境适应性进行分析,试验结果表明提出的指标体系能有效地评价光纤传感器失效状态,从而验证了该环境适应性分析方法的可行性。

Analysis Method for Airborne Environmental Adaptability of Civil Aircraft with Fiber Bragg Grating Sensors

The long-term application of Fiber Bragg Grating strain sensors is seriously affected by the severe airborne environmental conditions in the structure state monitoring of civil aircraft. To evaluate the airborne environmental adaptability of sensors, the airborne environmental conditions are analyzed, and the sensing characteristics are proposed as the evaluation index. The sensing characteristics evaluation index includes the sensitivity coefficient, linearity, zero drift and the temperature coefficient. And then a sensor effectiveness test method based on the equal strength beam was designed before and after the environmental test. Two types of Fiber Bragg Grating sensor, with coating and non-metallic substrate encapsulation, were used respectively. After 14 environmental tests, the problems of the sensors were exposed and the environmental adaptability of the sensors was analyzed. The experiment results show that the proposed index system can effectively evaluate the failure status of sensors, and all of these prove that the environmental adaptability analysis method is feasible.