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Proceedings Paper

Improvement of local strain measurement by grid method: new optical device and quasi-heterodyne technique
Author(s): Jean-Christophe Dupre; Mario Cottron; Alexis Lagarde
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Paper Abstract

Among optical strain measurement methods, the grid method is a powerful one. Progresses in the technique of information processing have contributed to develop classical analysis (optical and numerical Fourier transform). We propose a new optical device that allows the interference of diffracted beams from two crossed gratings of parallel lines marked on the specimen surface. The analysis of the interference fringes during loading provides the geometry of the gratings and so leads to the strain determination. The proposed method is insensitive to the specimen translations and presents a range from 105, with the use of a phase-shifting technique, to a few 102. Using experimental traction tests, we compare this method with the classical ones and we develop the performances of the proposed method (sensitivity and large measurement range).

Paper Details

Date Published: 22 October 1993
PDF: 8 pages
Proc. SPIE 2066, Industrial Optical Sensing and Metrology: Applications and Integration, (22 October 1993); doi: 10.1117/12.162093
Show Author Affiliations
Jean-Christophe Dupre, Univ. de Poitiers (France)
Mario Cottron, Univ. de Poitiers (France)
Alexis Lagarde, Univ. de Poitiers (France)

Published in SPIE Proceedings Vol. 2066:
Industrial Optical Sensing and Metrology: Applications and Integration
Kevin G. Harding; H. Philip Stahl, Editor(s)

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