| Numéro |
J. Phys. IV France
Volume 04, Numéro C7, Juillet 1994
8th International Topical Meeting on Photoacoustic and Photothermal Phenomena8 ITMP3 / 8éme conférence internationale de photoacoustique et photothermique |
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|---|---|---|
| Page(s) | C7-551 - C7-554 | |
| DOI | https://doi.org/10.1051/jp4:19947129 | |
8th International Topical Meeting on Photoacoustic and Photothermal Phenomena
8 ITMP3 / 8éme conférence internationale de photoacoustique et photothermique
J. Phys. IV France 04 (1994) C7-551-C7-554
DOI: 10.1051/jp4:19947129
1 Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität, Max-Wien-Platz 1, 07743 Jena, Germany
2 York-University, Department of Physics and Astronomy, 4700 Keele Street, North York, Canada, M3J 1P3
© EDP Sciences 1994
8 ITMP3 / 8éme conférence internationale de photoacoustique et photothermique
J. Phys. IV France 04 (1994) C7-551-C7-554
DOI: 10.1051/jp4:19947129
A proposal for the reconstruction of buried defects from photothermal images
U. Seidel1, H.G. Walther1 and J.A. Burt21 Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität, Max-Wien-Platz 1, 07743 Jena, Germany
2 York-University, Department of Physics and Astronomy, 4700 Keele Street, North York, Canada, M3J 1P3
Abstract
The object reconstruction from synthesized and noisy photothermal signals was carried out by deconvoluting contrast scans by means of photothermal point spread function. The unknown defect depth parameter was estimated by minimizing the "imaginary content" of the deconvoluted real valued defect distribution. The algorithm shows remarkable accuracy even in the presence of 10%-noise in finding the true defect depth. Essential for its convergence is an effective noise suppression which we achieved by a modified Wiener filter.
© EDP Sciences 1994