15 September 2006 Material testing by digital speckle correlation
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Proceedings Volume 6341, Speckle06: Speckles, From Grains to Flowers; 63410D (2006) https://doi.org/10.1117/12.695274
Event: Speckle06: Speckles, From Grains to Flowers, 2006, Nimes, France
Abstract
This paper describes noncontacting material testing that detects displacement of laser speckle patterns by a digital speckle correlation technique. It tracks displacement of two separated positions on a specimen by separate movable heads having a laser diode and a CCD camera. Each head is driven under the feedback control that cancels the speckle displacement detected by a real-time correlator. The position of each head is monitored by an electronic encoder to derive elongation of the specimen. Strain is evaluated from the ratio of the elongation to the original interval of the measured positions. Stress-strain curve obtained from this method agreed well with a conventional method using line markings mechanically attached on the specimen. The measurement could be carried out under the same conditions and speed as the conventional material test at 500 mm/min.
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Ichirou Yamaguchi, Takashi Ida, Masayuki Yokota, Koichi Kobayashi, "Material testing by digital speckle correlation", Proc. SPIE 6341, Speckle06: Speckles, From Grains to Flowers, 63410D (15 September 2006); doi: 10.1117/12.695274; https://doi.org/10.1117/12.695274
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