
Proceedings Paper
Characterization and compensation of decorrelations in interferometric set-ups using active opticsFormat | Member Price | Non-Member Price |
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Paper Abstract
Decorrelation in an interferometric set-up appears due to movements of the speckle pattern. In the case of rigid body
movements the effect of decorrelation severely limits the performance of speckle interferometers. If the movement is
larger than the speckle size the wanted phase information of the deformation is lost.
Phase modulating spatial light modulators (SLMs) provide a new method to non-mechanically deflect and shape light.
By using the SLM for scanning the field-of-view and focusing at different distances it is possible to measure intensity
speckle patterns in a three-dimensional volume. These intensity images can then be cross correlated to give a three-dimensional
correlation coefficient of the speckle pattern.
If an SLM is utilized in an interferometric set-up it is possible to compensate for unwanted movements during an
experiment. The measured correlation coefficient will then provide information regarding how large movements that are
allowed with maintained performance of the interferometer. It is shown that for large movements the SLM can be used to
retrieve phase maps.
Paper Details
Date Published: 18 June 2007
PDF: 9 pages
Proc. SPIE 6616, Optical Measurement Systems for Industrial Inspection V, 661619 (18 June 2007); doi: 10.1117/12.726054
Published in SPIE Proceedings Vol. 6616:
Optical Measurement Systems for Industrial Inspection V
Wolfgang Osten; Christophe Gorecki; Erik L. Novak, Editor(s)
PDF: 9 pages
Proc. SPIE 6616, Optical Measurement Systems for Industrial Inspection V, 661619 (18 June 2007); doi: 10.1117/12.726054
Show Author Affiliations
Emil Hällstig, Optronic (Sweden)
Angelica Svanbro, Luleå Univ. of Technology (Sweden)
Published in SPIE Proceedings Vol. 6616:
Optical Measurement Systems for Industrial Inspection V
Wolfgang Osten; Christophe Gorecki; Erik L. Novak, Editor(s)
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