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12 April 2004 Development of a new processing technique of sequential temperature data after pulse heating for quantitative nondestructive testing
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Abstract
Pulse thermography has been developed by several researchers as one of effective quantitative thermographic NDT techniques. The interest of the researchers has been focused on how to process transient temperature data after pulse heating to conduct successful identification of defect parameters such as its depth, shape and size. In this paper, a simple thermographic NDT technique termed "Rmax method" is proposed, in which the maximum value of the temperature rise ratio is related to the defect depth. The feasibility of the proposed technique is examined in the quantitative identification of the remaining thickness of the steel plate with corrosive material loss defects. Numerical and experimental investigations were made to obtain the relationships between Rmax and remaining thickness ratio. It was found that the relationship between Rmax and remaining thickness ratio was independent of material’s thermal properties. It was also found that the relationship between Rmax and remaining thickness ratio was not influenced by the size of corrosive material loss defect when the thickness of the plate was thin enough compared to the size of defect. The practicability of the present technique was examined for quantitative identification of actual material loss defects appeared on backside of the steel automobile panel.
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Takahide Sakagami, Shiro Kubo, Takeshi Endo, and Yoshifumi Asakura "Development of a new processing technique of sequential temperature data after pulse heating for quantitative nondestructive testing", Proc. SPIE 5405, Thermosense XXVI, (12 April 2004); https://doi.org/10.1117/12.546477
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