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|Document Type: ||Article|
|Title: ||Quantitative shearography: error reduction by using more than three measurement
|Authors: ||Charrett, Thomas O. H.|
Tatam, Ralph P.
|Issue Date: ||2011|
|Citation: ||Charrett T.O.H, Francis D., Tatam R.P., Quantitative shearography: error reduction by using more than three measurement
channels. Applied Optics, Vol. 50, Iss. 2, January 2011, pp134-146|
|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.|
|Appears in Collections:||Staff publications - School of Engineering|
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