Abstract
Infrared thermography is one of most attractive techniques for diagnosing various invisible defects included in objects or bodies, because two-dimensional field of testing targets can be evaluated nondestructively and instantaneously. In this paper, three-dimensional numerical simulation of thermal conduction is performed for nondestructive diagnosis using infrared rays to confirm the applicability and to establish the diagnostic standard. They are evaluated by changing size of defects and thermophysical properties of testing targets. It is revealed from a series of numerical simulation and image processing that the infrared thermography is useful in diagnosing invisible defects.
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