6 April 1993 Remote sensing study of detecting of flaws in structural material
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A new thermal radiation technique using an infrared radiometer has been developed to detect flaws of materials, such as inclusion, crack and pinhole. In the present study, several incident radiation energies like sun, lamp and gas, were injected to the test material with an artificial internal flaw. Transient radiation temperature image of the flaw on the CRT represents the existence of the internal flaw with higher radiation temperature than that of the surface without the flaw. The characteristics of various incident energy methods were compared with each other. The detecting limitation of internal flaws is determined by the surface temperature variance of the tested materials. The heat flow around the flaw was numerically analyzed by solving a heat conduction equation to verify the surface temperature behavior above the flaws.
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Yoshizo Okamoto, Fumito Kaminaga, Terumi Inagaki, Tatsuya Numao, Kimio Fukuzawa, Hiroya Ichikawa, "Remote sensing study of detecting of flaws in structural material", Proc. SPIE 1933, Thermosense XV: An International Conference on Thermal Sensing and Imaging Diagnostic Applications, (6 April 1993); doi: 10.1117/12.141971; https://doi.org/10.1117/12.141971

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