Development of a non-contacting extensometer using digital speckle correlation

Ichirou Yamaguchi; Koichi Kobayashi; Takashi Ida; Masayuki Yokota

doi:10.1117/12.618290

18 August 2005 Development of a non-contacting extensometer using digital speckle correlation

Ichirou Yamaguchi, Koichi Kobayashi, Takashi Ida, Masayuki Yokota

Proceedings Volume 5880, Optical Diagnostics; 58800E (2005) https://doi.org/10.1117/12.618290
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

A new extensometer has been developed which needs no attachment of line markers or mechanical attachment on a specimen. An expanded beam from a laser diode is incident on the marker position of a specimen which is imaged by a lens on a C-MOS image sensor. The resultant laser-speckle patterns are analyzed by two-dimensional digital correlation at the rate of 20 frames per second. It provides speckle displacement by means of a phase-only-correlation device which uses only phase of Fourier transform of the image. In-plane displacement of the marker position is tracked by moving a head containing the laser and the image sensor under the feedback control that compensates for the speckle displacement detected. Two positions on the specimen are tracked by a pair of the heads. From rubber specimens which had a marker distance of 20 mm and were elongated at the velocity of 500 mm/sec we observed good agreement in load-strain curves with the results from the conventional methods using mechanical trackers.

Citation Download Citation

Ichirou Yamaguchi, Koichi Kobayashi, Takashi Ida, and Masayuki Yokota "Development of a non-contacting extensometer using digital speckle correlation", Proc. SPIE 5880, Optical Diagnostics, 58800E (18 August 2005); https://doi.org/10.1117/12.618290

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KEYWORDS

Speckle

Head

Image sensors

Laser marking

Speckle pattern

Cameras

Computer programming

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