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Proceedings Paper

Holographic soundfield visualization for nondestructive testing of hot surfaces
Author(s): Horst-Artur Crostack; E. H. Meyer; Klaus-Juergen Pohl
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Paper Abstract

Nondestructive testing (NDT) of near-surface component regions is of great importance, because functionality, loading capacity, and lifetime of components often depend on material condition and discontinuities (flaws) in these regions. It is therefore necessary to provide reliable and problem-matched testing techniques to monitor material condition and to detect relevant inhomogeneities. This especially is true of the NDT of hot surfaces of continuously casting slabs in the steel industry. With respect to NDT, several surface and subsurface testing techniques have been developed. The classical methods of surface testing (e.g., visual inspection, dye penetration testing, magnetic particle testing) reveal a series of shortcomings, but these techniques often have the inability for hot surface testing. Fast and noncontact methods are required, especially in the field of hot surface testing. In the following a special NDT-technique, based on holographic interferometry and ultrasonics is presented which can reduce some problems in hot surface testing. By this technique, free-running ultrasonic waves insonified at the surface to be tested are visualized holographic-interferometrically. Disturbances of the otherwise homogeneous acoustic wave fronts, as they are depicted in the soundfield image, indicate near-surface flaws, which can be described with regard to their location and size.

Paper Details

Date Published: 1 October 1991
PDF: 9 pages
Proc. SPIE 1508, Industrial Applications of Holographic and Speckle Measuring Techniques, (1 October 1991); doi: 10.1117/12.47095
Show Author Affiliations
Horst-Artur Crostack, Qualitaetszentrum Dortmund GmbH & Co. KG (Germany)
E. H. Meyer, Univ. of Dortmund (Germany)
Klaus-Juergen Pohl, Qualitaetszentrum Dortmund GmbH & Co. KG (Germany)


Published in SPIE Proceedings Vol. 1508:
Industrial Applications of Holographic and Speckle Measuring Techniques
Werner P. O. Jueptner, Editor(s)

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