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Proceedings Paper

DSPI: complex amplitude correlation for large in-plane compensations and phase evaluation
Author(s): Angelica Svanbro
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Paper Abstract

The use of complex amplitude correlation to determine the deformation field for in-plane motions in digital speckle pattern interferometry (DSPI) is investigated. The result is compared to experiments where only DSPI-algorithms, as well as where combined DSPI-intensity correlation are used. Experiments with and without large rigid body motions are studied. An advantage of using complex amplitude correlation instead of intensity correlation is that the phase change describing the deformation is retrieved directly from the correlation peak and there is no need to compensate for the large movement and then use interferometric algorithms to obtain the phase information. A discovered drawback of this method is that the correlation values drops very quick if there is a phase gradient larger than π across the sub image used for the cross correlation. This means that in order to use the complex amplitude correlation the size of the subimages must be proportional to the magnitude of the present deformation gradient. Or, a third parameter in the cross-correlation algorithm that compensates for the phase variation is needed.

Paper Details

Date Published: 15 September 2006
PDF: 5 pages
Proc. SPIE 6341, Speckle06: Speckles, From Grains to Flowers, 63410I (15 September 2006); doi: 10.1117/12.695285
Show Author Affiliations
Angelica Svanbro, Luleå Univ. of Technology (Sweden)

Published in SPIE Proceedings Vol. 6341:
Speckle06: Speckles, From Grains to Flowers
Pierre Slangen; Christine Cerruti, Editor(s)

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