Nondestructive testing of microcracks using digital speckle pattern shearing interferometry

Wolfgang Steinchen; Lian Xiang Yang; Gerhard Kupfer; Peter Maeckel

doi:10.1117/12.281199

17 September 1997 Nondestructive testing of microcracks using digital speckle pattern shearing interferometry

Wolfgang Steinchen, Lian Xiang Yang, Gerhard Kupfer, Peter Maeckel

Author Affiliations +

Proceedings Volume 3098, Optical Inspection and Micromeasurements II; (1997) https://doi.org/10.1117/12.281199
Event: Lasers and Optics in Manufacturing III, 1997, Munich, Germany

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.

Citation Download Citation

Wolfgang Steinchen, Lian Xiang Yang, Gerhard Kupfer, and Peter Maeckel "Nondestructive testing of microcracks using digital speckle pattern shearing interferometry", Proc. SPIE 3098, Optical Inspection and Micromeasurements II, (17 September 1997); https://doi.org/10.1117/12.281199

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