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Proceedings Paper

Material testing by digital speckle correlation
Author(s): Ichirou Yamaguchi; Takashi Ida; Masayuki Yokota; Koichi Kobayashi
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Paper 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.

Paper Details

Date Published: 15 September 2006
PDF: 7 pages
Proc. SPIE 6341, Speckle06: Speckles, From Grains to Flowers, 63410D (15 September 2006); doi: 10.1117/12.695274
Show Author Affiliations
Ichirou Yamaguchi, Gunma Univ. (Japan)
Takashi Ida, Gunma Univ. (Japan)
Masayuki Yokota, Gunma Univ. (Japan)
Koichi Kobayashi, Toyo Seiki Seisaku-sho, Ltd. (Japan)

Published in SPIE Proceedings Vol. 6341:
Speckle06: Speckles, From Grains to Flowers
Pierre Slangen; Christine Cerruti, Editor(s)

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