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Proceedings Paper

A combined experiment with simulation approach to calibrated 3D strain measurement using shearography
Author(s): Dênis T. Goto; Roger M. Groves
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Paper Abstract

This paper is concerned with the development of a calibrated 3D shearography strain measurement instrument, calibrated iteratively, using a combined mechanical-optical model and specially designed test objects. The test objects are a cylinder loaded by internal pressure and a flat plate under axial load. Finite element models of the samples, combined with optical models of the shearography system, allow phase maps to be simulated for subsequent comparison with experimental phase maps from the shearography instrument. The algorithm to extract the strain maps from the phase maps includes an error compensation for in-plane strains on curved surfaces, measurement channel redundancy, variations in the shear magnitude due to object shape and the optical characteristics of the imaging system. The improvement introduced by the error compensation techniques is verified by the opto-mechanical simulation and its effect is demonstrated experimentally on maps of displacement gradient.

Paper Details

Date Published: 13 September 2010
PDF: 10 pages
Proc. SPIE 7387, Speckle 2010: Optical Metrology, 73871J (13 September 2010); doi: 10.1117/12.870572
Show Author Affiliations
Dênis T. Goto, Delft Univ. of Technology (Netherlands)
Univ. Federal de Santa Catarina (Brazil)
Roger M. Groves, Delft Univ. of Technology (Netherlands)

Published in SPIE Proceedings Vol. 7387:
Speckle 2010: Optical Metrology
Armando Albertazzi Goncalves; Guillermo H. Kaufmann, Editor(s)

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