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Proceedings Paper

Nondestructive testing of wood defected samples by ESPI
Author(s): Elena Achimova; V. Abaskin; P. Castellini
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Paper Abstract

Deterioration of wood artwork is often connected to mechanical material degradation that starts on microscopic scales. Insight into decay mechanisms can be obtained by monitoring surface microscopic deformation and displacement fields. This paper presents the application of Electronic Speckle Pattern Interferometry (ESPI) to detect invisible on the surface intrinsic defects of a wood samples. The different artificial defects were created under the pine wood surface to simulate "defected" samples. The fiber-optic ESPI set-up based on a He-Ne CW laser has been developed and used for the studying the possibility determination of locations, sizes and shapes of wood defects. For this end two digital holograms of the test object, corresponding to vibrating states of the non-heated and heated states of object, are captured at two video frames of the CCD camera, transferred in a frame-grabber and then processed in a PC. The resulted the fringe pattern has the information about the defects. Obtained fringe patterns of all defects are presented. The purpose of work was determining the sensitivity of ESPI method in application to different sizes and forms of defects.

Paper Details

Date Published: 21 June 2006
PDF: 9 pages
Proc. SPIE 6345, Seventh International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 634508 (21 June 2006); doi: 10.1117/12.693109
Show Author Affiliations
Elena Achimova, Polytechnic Univ. of Marche (Italy)
V. Abaskin, Polytechnic Univ. of Marche (Italy)
P. Castellini, Polytechnic Univ. of Marche (Italy)

Published in SPIE Proceedings Vol. 6345:
Seventh International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
Enrico Primo Tomasini, Editor(s)

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