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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 16 — Jun. 1, 2012
  • pp: 3153–3161

Three-dimensional reconstruction of subsurface defects using finite-difference modeling on pulsed thermography

J. C. Ramirez-Granados, G. Paez, and M. Strojnik  »View Author Affiliations


Applied Optics, Vol. 51, Issue 16, pp. 3153-3161 (2012)
http://dx.doi.org/10.1364/AO.51.003153


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Abstract

We develop a technique to analyze pulsed thermography videos in order to detect and reconstruct subsurface defects in homogeneous and layered objects. The technique is based on the analysis of the thermal response of an object to a heat pulse. This thermal response is compared to the predictions of a finite-difference model that is systematically and progressively adjusted to minimize a cost function. With this minimization process, we obtain a depth and a thickness function that allow us to determine the three-dimensional shape, size, depth, thickness, and location of internal defects. The detected defects are reliably reconstructed with graphics of easy interpretation.

© 2012 Optical Society of America

OCIS Codes
(100.3190) Image processing : Inverse problems
(100.6890) Image processing : Three-dimensional image processing
(110.3080) Imaging systems : Infrared imaging
(120.1880) Instrumentation, measurement, and metrology : Detection
(120.4290) Instrumentation, measurement, and metrology : Nondestructive testing
(110.4155) Imaging systems : Multiframe image processing

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: September 7, 2011
Revised Manuscript: October 27, 2011
Manuscript Accepted: October 27, 2011
Published: May 22, 2012

Citation
J. C. Ramirez-Granados, G. Paez, and M. Strojnik, "Three-dimensional reconstruction of subsurface defects using finite-difference modeling on pulsed thermography," Appl. Opt. 51, 3153-3161 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-16-3153

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