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Proceedings Paper

Whole-field speckle strain sensor
Author(s): Mikael Sjodahl
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Paper Abstract

The construction of a whole field speckle strain sensor is reported. The sensor makes use of the in-plane motion of defocused laser speckles in a telecentric imaging system. To distinguish between the contribution to the speckle motion from surface displacement, strain, rotation and tilt three different illumination directions were used. For illumination three pigtailed laser diodes of slightly different wavelength was used. To allow for simultaneous acquisition of the three speckle patterns, the different wavelengths were splitted with the aid of dichroic mirrors and directed onto separate synchronized detectors. The motion of the three speckle patterns is calculated using digital speckle photography and combined to give the three in-plane components of the strain tensor. A discussion about sources of random and systematic errors are included.

Paper Details

Date Published: 7 May 1999
PDF: 4 pages
Proc. SPIE 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99), (7 May 1999); doi: 10.1117/12.347769
Show Author Affiliations
Mikael Sjodahl, Lulea Univ. of Technology (Sweden)

Published in SPIE Proceedings Vol. 3740:
Optical Engineering for Sensing and Nanotechnology (ICOSN '99)
Ichirou Yamaguchi, Editor(s)

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