14 November 1996 Measuring corrosion thinning by thermal-wave imaging
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We describe an IR thermal wave imaging technique for making corrosion thinning determinations on aging aircraft skins. The technique uses pulsed surface heating and fast, synchronous IR imaging of subsurface structure, such as skin corrosion and disbonded doublers or tear straps. Sensitivity to corrosion thinning of less than two percent is demonstrated. Practical implementation of a simplified numerical measurement algorithm is presented, and the results are compared with profilometry and ultrasonic measurements of calibration standards. Examples are presented of thermal wave imaging of fuselage skin corrosion of a B737 testbed aircraft in a hangar environment at the FAA's Aging Aircraft NDI Validation Center.
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Lawrence D. Favro, Lawrence D. Favro, Xiaoyan Han, Xiaoyan Han, Tasdiq Ahmed, Tasdiq Ahmed, Pao-Kuang Kuo, Pao-Kuang Kuo, Robert L. Thomas, Robert L. Thomas, } "Measuring corrosion thinning by thermal-wave imaging", Proc. SPIE 2945, Nondestructive Evaluation of Aging Aircraft, Airports, and Aerospace Hardware, (14 November 1996); doi: 10.1117/12.259112; https://doi.org/10.1117/12.259112

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