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Proceedings Paper

Characterization of micromaterials using laser speckles
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Paper Abstract

This document shows the theory and set-up of a non-contact measurement strain gauge, which measures translation and strain of a mechanically or thermally loaded specimen. The measurement gauge basically consists of a light source emitting a collimated monochromatic laser beam illuminating the specimen and two CMOS line- scan cameras, which are arranged symmetrically about the incident laser beam picking up speckled reflection. The cameras are recording the granular laser speckles in specific time-intervals and the subsequent images are processed by an algorithm1 implemented in GNU C. As a result one obtains accurate information about changes in the state of strain and rigid body translation the specimen undergoes2 . Furthermore experimental results are introduced. The dilatation of a piezo-stack, the elastic modulus of a thin copper wire and the elastic modulus of a soldering joint are investigated.

Paper Details

Date Published: 20 October 2006
PDF: 9 pages
Proc. SPIE 6371, Photonic Sensing Technologies, 63710Q (20 October 2006); doi: 10.1117/12.686049
Show Author Affiliations
Roland Kothbauer, Johannes Kepler Univ. (Austria)
Stefan J. Rupitsch, Johannes Kepler Univ. (Austria)
Bernhard G. Zagar, Johannes Kepler Univ. (Austria)

Published in SPIE Proceedings Vol. 6371:
Photonic Sensing Technologies
Michael A. Marcus; Brian Culshaw; John P. Dakin, Editor(s)

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