Inversion of pulsed thermal-wave images for defect sizing and shape recovery

Lawrence D. Favro; D. J. Crowther; Pao-Kuang Kuo; Robert L. Thomas

doi:10.1117/12.58534

1 April 1992 Inversion of pulsed thermal-wave images for defect sizing and shape recovery

Lawrence D. Favro, D. J. Crowther, Pao-Kuang Kuo, Robert L. Thomas

Proceedings Volume 1682, Thermosense XIV: An Intl Conf on Thermal Sensing and Imaging Diagnostic Applications; (1992) https://doi.org/10.1117/12.58534
Event: Aerospace Sensing, 1992, Orlando, FL, United States

Abstract

An outstanding problem of thermal wave imaging has been the blurring of the images caused by lateral diffusion of heat in the sample. In this paper we describe a technique for removing this blurring in images of planar subsurface features such as delaminations. This technique is based on a model which allows us to develop an algorithm which performs a mathematical inversion of the scattering process when it is applied to experimental data. The result is a theoretical and experimental demonstration that the blurring of thermal wave images is not due to any inherent loss of information in the diffusion process, but that it can, in fact, be removed by appropriate processing of the image. The result is a very significant improvement of the resolution of the imaging process.

Citation Download Citation

Lawrence D. Favro, D. J. Crowther, Pao-Kuang Kuo, and Robert L. Thomas "Inversion of pulsed thermal-wave images for defect sizing and shape recovery", Proc. SPIE 1682, Thermosense XIV: An Intl Conf on Thermal Sensing and Imaging Diagnostic Applications, (1 April 1992); https://doi.org/10.1117/12.58534

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