Paper
13 September 2010 A combined experiment with simulation approach to calibrated 3D strain measurement using shearography
Dênis T. Goto, Roger M. Groves
Author Affiliations +
Proceedings Volume 7387, Speckle 2010: Optical Metrology; 73871J (2010) https://doi.org/10.1117/12.870572
Event: Speckle 2010, 2010, Florianapolis, Brazil
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.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Dênis T. Goto and Roger M. Groves "A combined experiment with simulation approach to calibrated 3D strain measurement using shearography", Proc. SPIE 7387, Speckle 2010: Optical Metrology, 73871J (13 September 2010); https://doi.org/10.1117/12.870572
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CITATIONS
Cited by 8 scholarly publications.
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KEYWORDS
Cameras

Shearography

3D metrology

Content addressable memory

Calibration

Sensors

3D modeling

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