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Proceedings Paper

New synchronous detection approach in optical transmission imaging
Author(s): Karen Z. Vardanyan; Anna A. Khachaturova; Sargis M. Varzhapetyan; Anahit M. Badalyan; Svetlana V. Shmavonyan; Aram V. Papoyan
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Paper Abstract

The key problems of optical transmission imaging of thick complex biological objects are strong diffusion (scattering) and non-uniform intensity distribution of transmitted signal across the scanned area. These constraints essentially reduce the spatial resolution and uniformity of the overall pattern. We report on implementation of a new approach of signal detection scheme, which relies on synchronization of lock-in amplifier with a temporal step of laser beam discrete scanning. This technique is favorable for preferential detection of abrupt spatial features, increase of contrast and substantial reduction of overall non-uniformity of image brightness. On the other hand, the lock-in detection scheme, being phase-sensitive, helps to some extent to enhance the contribution of least-deflected photons in the recorded signal thus suppressing the diffusion component. We present the results of measurements showing efficiency of the proposed scheme.

Paper Details

Date Published: 4 March 2011
PDF: 5 pages
Proc. SPIE 7998, International Conference on Laser Physics 2010, 799814 (4 March 2011); doi: 10.1117/12.891718
Show Author Affiliations
Karen Z. Vardanyan, Institute for Physical Research (Armenia)
Anna A. Khachaturova, Institute for Physical Research (Armenia)
Sargis M. Varzhapetyan, Institute for Physical Research (Armenia)
Anahit M. Badalyan, Institute for Physical Research (Armenia)
Svetlana V. Shmavonyan, Institute for Physical Research (Armenia)
Aram V. Papoyan, Institute for Physical Research (Armenia)

Published in SPIE Proceedings Vol. 7998:
International Conference on Laser Physics 2010
Aram V. Papoyan, Editor(s)

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