Method and system for simultaneously identifying size and depth of internal defect of composite material

Abstract

The invention provides a method and system for simultaneously identifying the size and depth of an internal defect of a composite material, and belongs to the field of nondestructive testing. According to the method, thermal contrast data of the surface of a test piece is obtained by using an active infrared thermal imaging technology, and simultaneous identification of the size and depth of an internal defect is realized by carrying out iterative optimization solution on a two-dimensional heat conduction inverse problem. Compared with a traditional method, the method has the advantages that the influence of transverse thermal diffusion and temperature measurement noise on defect quantitative evaluation is effectively restrained, the purpose of improving the defect size and depth recognition precision is achieved, and the method has the advantages of being high in detection precision, high in calculation speed and high in applicability and can be applied to various active infrared thermal imaging technologies.

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