光纤光栅传感器民机机载环境适应性分析方法.

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. [ABSTRACT FROM AUTHOR]