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

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