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Proceedings Paper

Digital image processing of holographic soundfield images
Author(s): Horst-Artur Crostack; E. H. Meyer; Klaus-Juergen Pohl
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Paper Abstract

The operaUon of machines and plants often leads to a strong loading of near-surface regions. Consequently, the non-destructive testing (NDT) of these regions during production as well as inspection is of high interest. Besides flaw detection the used test method should allow an exact flaw description. Furthermore contactiess techniques and the possibility of automation are points of interest. One technique which fulfils most of these requirements is the holographic soundfield visualization /1/. This technique allows large area detection of ultrasound (US) surface waves by means of opto-holographic methods. The test result is given by an image of the object surface covered with interference fringes representing the soundwave fronts. Until now only visual evaluation of the recorded soundfield images is performed. Because of the superposition of flaw pattern with the pattern of the insonicated soundwave, an exact flaw analysis appears difficult. with respect to precise as well as automatic testing digital image processing can be applied. The main task of image processing of soundfield images should be the isolation of flaw information from the background which is given by the insonicated wave and the image of the object surface.

Paper Details

Date Published: 1 January 1992
PDF: 6 pages
Proc. SPIE 1553, Laser Interferometry IV: Computer-Aided Interferometry, (1 January 1992); doi: 10.1117/12.135337
Show Author Affiliations
Horst-Artur Crostack, Qualitaetszentrum Dortmund GmbH & Co. KG (Germany)
E. H. Meyer, Univ. Dortmund (Germany)
Klaus-Juergen Pohl, Qualitaetszentrum Dortmund GmbH & Co. KG (Germany)

Published in SPIE Proceedings Vol. 1553:
Laser Interferometry IV: Computer-Aided Interferometry
Ryszard J. Pryputniewicz, Editor(s)

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