吸波涂层缺陷的锁相法红外检测

利用有限元仿真和试验研究相结合的方法,对方形和圆形模拟缺陷的吸波涂层试件开展检测研 究。从而探索红外锁相热波技术检测吸波涂层内部缺陷的参数范围和检测能力。研究结果表明,通过有限元 仿真分析为检测试验提供理论依据,使用5 ~10 mHz 调制频率的锁相法可有效检测到3 mm×3 mm 面积当量的 缺陷,缺陷处的相位比无缺陷处的相位滞后,并且缺陷面积越大,相位滞后越大。

Detecting of Defects in Radar Absorbing Coating Using Lock-in Thermography

In this study, in order to explore the ability and experimental parameters to detect the internal defects of radar absorbing coating using the lock-in thermography technology, the method, which combined the finite element (FE) simulation and experimental research, is used to study for the square and circular simulated defects testing of the coating specimens. The analysis results show that the finite element simulation provides theoretical support for experiment and the defect of the equivalent area which is 3 mm×3 mm can be detected when the range of modulation frequency is 5 to 10 mHz. In addition,the phases of defects are lagged compared to defects cerea, and phase delay get bigger with the area of the defects increasing.