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9 October 2021 Sequential laser pulse thermal excitation method for the detection of defects in metallic materials
Wei Fang, Xue Yang, Xiangyu Wang, Gangbo Hu, Ning Tao, Cunling Zhang
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Proceedings Volume 11906, Infrared, Millimeter-Wave, and Terahertz Technologies VIII; 119061F (2021) https://doi.org/10.1117/12.2602753
Event: SPIE/COS Photonics Asia, 2021, Nantong, JS, China
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Abstract
This paper mainly explores the application of thermal signals generated by sequential laser pulses in the detection of metal material defects. Here we use flat bottom holes with different sizes on stainless steel as our sample. Sequential laser pulses are used as thermal excitation source and the surface temperature field is recorded by infrared thermal imager.By analyzing the relationship between the surface temperature of the defect area under sequential pulse excitation, the defect aspect ratio can be obtained due to different 3D thermal diffusion process. The experimental scheme and data processing method described in this paper provide a new method and theoretical basis for the measurement of metal defects size by sequential laser pulses, and have certain reference value for the detection and research of other metal material defects
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Wei Fang, Xue Yang, Xiangyu Wang, Gangbo Hu, Ning Tao, and Cunling Zhang "Sequential laser pulse thermal excitation method for the detection of defects in metallic materials", Proc. SPIE 11906, Infrared, Millimeter-Wave, and Terahertz Technologies VIII, 119061F (9 October 2021); https://doi.org/10.1117/12.2602753
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KEYWORDS
Pulsed laser operation
Thermography
Defect detection
Metals
Solid state lasers
Infrared cameras
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