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Proceedings Paper

Linear OCT system with down conversion of the fringe pattern
Author(s): Peter Koch; Gereon Huettmann; Hansfrieder Schleiermacher; Joerg Eicholz; Edmund Koch
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Paper Abstract

OCT sensors traditionally use scanning optical delay lines with moving parts and a single detector. Compared to this OCT systems with a linear detector array (linear OCT or LOCT) are very simple and robust, but a detector with approximately 104 pixel is needed for a imaging depth of 2 millimeter. We present a new system for LOCT which extends the measurement range of LOCT systems by attaching a mask on the image sensor. The mask essentially performs a down conversion of the spatial frequencies by multiplication with a second spatial frequency. We use this effect to reduce the fringe frequency of the OCT signal so that sampling and calculating the modulation of the signal can be done with relatively few pixels. The theory for this approach is addressed and first measurements are presented.

Paper Details

Date Published: 1 July 2004
PDF: 8 pages
Proc. SPIE 5316, Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine VIII, (1 July 2004); doi: 10.1117/12.531323
Show Author Affiliations
Peter Koch, Medizinisches Laserzentrum Lubeck GmbH (Germany)
Gereon Huettmann, Medizinisches Laserzentrum Lubeck GmbH (Germany)
Hansfrieder Schleiermacher, Medizinisches Laserzentrum Lubeck GmbH (Germany)
Joerg Eicholz, Fraunhofer-Institut fur Siliziumtechnologie (Germany)
Edmund Koch, Technische Univ. Dresden (Germany)

Published in SPIE Proceedings Vol. 5316:
Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine VIII
Valery V. Tuchin; Joseph A. Izatt; James G. Fujimoto, Editor(s)

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