光纤光栅传感器与机械结构预处理胶接方法

摘要

The high precision measurement of structure stress and strain has the vital significance for helicopter dynamic and static strength monitoring and assessment.Since the fiber Bragg grating (FBG)sensor has good flexibility,core diameter of fine,strong ability to resist electromagnetic interference,easy to realize distributed monitoring and other significant advantages,it is paid widespread attention in the field of aerospace plane structural strength monitoring.To improve strain monitoring accuracy and sensitivity of helicopter,FBG strain sensing principle and factors influencing the sensor precision are studied,and the plate-structural strain monitoring system based on FBG sensor is also constructed.The stripping coating layer of grating area,the prestress as well as the double-layer glue joint are presented, respectively.These pretreatment cementing methods are advantage to improve strain measurement accuracy of board structure based on FBG sensors.%结构应力应变高精度测量对于实现直升机动静态强度监测与评估具有至关重要的意义.由于光纤光栅传感器具有柔韧性好、芯径细、抗电磁干扰能力强以及便于实现分布式监测等显著优点,使得其在航空航天器结构强度监测领域受到广泛重视.为提升直升机应变监测精度与灵敏度,本文研究了光纤光栅传感器应变感知原理和精度影响因素,构建了基于光纤光栅传感器的板结构应变监测系统.在此基础上,提出剥离光栅栅区涂覆层、施加预应力及其双层胶接等预处理集成方法,实现对板结构光纤光栅传感器应变测量精度的有效提升.