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Proceedings Paper

Quantitative Strain Measurement Through Holographic Interferometry
Author(s): R. Dandliker; B. lneichen
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Paper Abstract

The basic problems of quantitative determination of mechanical strain through holographic interferometry are discussed. A solution based on the calculation of local derivatives ofthe holographically recorded surface displacements is described. This method uses essentially heterodyne holographic interferometry for the quantitative determination of the surface displacement from the fringe pattern in the image plane. With this techqque the interference phase can be measured with an accuracy and reproducibility of ± 0.33at any point in the fringe pattern, corresponding to an interpolation of better than 10-3 of one fringe-Numerical examples are given for the sensitivity and accuracy of surface strain measurements and the determination of bending and torsion. Experimental results for bending and torsion of arbitrarily curved and twisted space beams, such as turbine blades, are reported. Accuracy and agreement with theory are within a few percent.

Paper Details

Date Published: 10 April 1977
PDF: 9 pages
Proc. SPIE 0099, 3rd European Electro-Optics Conf, (10 April 1977); doi: 10.1117/12.955309
Show Author Affiliations
R. Dandliker, Brown Boveri Research Center (Switzerland)
B. lneichen, Brown Boveri Research Center (Switzerland)

Published in SPIE Proceedings Vol. 0099:
3rd European Electro-Optics Conf
Herbert A. Elion, Editor(s)

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