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Proceedings Paper

Nondestructive testing of microcracks using digital speckle pattern shearing interferometry
Author(s): Wolfgang Steinchen; Lian Xiang Yang; Gerhard Kupfer; Peter Maeckel
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Paper Abstract

Digital speckle pattern shearing interferometry, also called digital shearography or TV-shearography, is a coherent optical method in conjunction with digital image processing. It measures displacement derivatives directly and obtains thus the strain information. As a nondestructive testing tool, this technique has many advantages compared with TV- holography. It is simple in optical setup, relatively insensitive against ambient noise and usable with a simple laser diode for illumination. This paper will focus mainly on its applications for nondestructive testing of micro- cracks. The stressing methods corresponding to the micro- cracks in different objects are proposed and some investigated examples are shown.

Paper Details

Date Published: 17 September 1997
PDF: 8 pages
Proc. SPIE 3098, Optical Inspection and Micromeasurements II, (17 September 1997); doi: 10.1117/12.281199
Show Author Affiliations
Wolfgang Steinchen, Univ. of Kassel (Germany)
Lian Xiang Yang, Univ. of Kassel (United States)
Gerhard Kupfer, Univ. of Kassel (Germany)
Peter Maeckel, Univ. of Kassel (Germany)

Published in SPIE Proceedings Vol. 3098:
Optical Inspection and Micromeasurements II
Christophe Gorecki, Editor(s)

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