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Proceedings Paper

Hologram reconstruction using liquid crystal spatial light modulators
Author(s): Denis Lebrun; Samir Belaid; Cafer Ozkul
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Paper Abstract

High-speed in-line holography is used to visualize the trajectories fibers which are drawn out in a turbulent flame. In order to improve the SNR, the images are not observed by a conventional reconstruction setup. In our case, the holographic plate is directly placed on the input plane of a wavelet-transform optical system. This processing system is based on a VanderLugt correlator including an Electrically Addressed Spatial Light Modulator (EASLM). The shape of matched filters is deduced by successive rotation and dilatation operations of wavelet functions in the Fourier domain. The 3-D location of a fiber element and its orientation are estimated by searching the daughter wavelet which yields the maximum intensity on the output plane of the correlator, which also contains the reconstructed image. The results are compared with those obtained by a conventional optical reconstruction. The SNR of the images observed on the output plane is improved. Moreover, it is shown that the axis coordinate accuracy is improved to (Delta) z equals plus or minus 50 micrometer, instead of plus or minus 0,5 mm for holographic reconstruction.

Paper Details

Date Published: 29 September 1998
PDF: 6 pages
Proc. SPIE 3407, International Conference on Applied Optical Metrology, (29 September 1998); doi: 10.1117/12.323355
Show Author Affiliations
Denis Lebrun, Univ. of Rouen (France)
Samir Belaid, Univ. of Rouen (France)
Cafer Ozkul, Univ. of Rouen (France)

Published in SPIE Proceedings Vol. 3407:
International Conference on Applied Optical Metrology
Pramod Kumar Rastogi; Ferenc Gyimesi, Editor(s)

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