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Quantitative shearography: error reduction by using more than three measurement channels |
Applied Optics, Vol. 50, Issue 2, pp. 134-146 (2011)
http://dx.doi.org/10.1364/AO.50.000134
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Abstract
Shearography is a noncontact optical technique used to measure surface displacement derivatives. Full surface strain characterization can be achieved using shearography configurations employing at least three measurement channels. Each measurement channel is sensitive to a single displacement gradient component defined by its sensitivity vector. A matrix transformation is then required to convert the measured components to the orthogonal displacement gradients required for quantitative strain measurement. This transformation, conventionally performed using three measurement channels, amplifies any errors present in the measurement. This paper investigates the use of additional measurement channels using the results of a computer model and an experimental shearography system. Results are presented showing that the addition of a fourth channel can reduce the errors in the computed orthogonal components by up to 33% and that, by using 10 channels, reductions of around 45% should be possible.
© 2011 Optical Society of America
OCIS Codes
(110.6150) Imaging systems : Speckle imaging
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.6160) Instrumentation, measurement, and metrology : Speckle interferometry
(100.3175) Image processing : Interferometric imaging
(110.3175) Imaging systems : Interferometric imaging
(120.6165) Instrumentation, measurement, and metrology : Speckle interferometry, metrology
ToC Category:
Image Processing
History
Original Manuscript: October 13, 2010
Revised Manuscript: November 11, 2010
Manuscript Accepted: November 14, 2010
Published: January 5, 2011
Citation
Tom O. H. Charrett, Daniel Francis, and Ralph P. Tatam, "Quantitative shearography: error reduction by using more than three measurement channels," Appl. Opt. 50, 134-146 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-2-134
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