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Proceedings Paper

Adaptive coded aperture imaging in the infrared: towards a practical implementation
Author(s): Chris W. Slinger; Kevin Gilholm; Neil Gordon; Mark McNie; Doug Payne; Kevin Ridley; Malcolm Strens; Mike Todd; Geoff De Villiers; Philip Watson; Rebecca Wilson; Gavin Dyer; Mike Eismann; Joe Meola; Stanley Rogers
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Paper Abstract

An earlier paper [1] discussed the merits of adaptive coded apertures for use as lensless imaging systems in the thermal infrared and visible. It was shown how diffractive (rather than the more conventional geometric) coding could be used, and that 2D intensity measurements from multiple mask patterns could be combined and decoded to yield enhanced imagery. Initial experimental results in the visible band were presented. Unfortunately, radiosity calculations, also presented in that paper, indicated that the signal to noise performance of systems using this approach was likely to be compromised, especially in the infrared. This paper will discuss how such limitations can be overcome, and some of the tradeoffs involved. Experimental results showing tracking and imaging performance of these modified, diffractive, adaptive coded aperture systems in the visible and infrared will be presented. The subpixel imaging and tracking performance is compared to that of conventional imaging systems and shown to be superior. System size, weight and cost calculations indicate that the coded aperture approach, employing novel photonic MOEMS micro-shutter architectures, has significant merits for a given level of performance in the MWIR when compared to more conventional imaging approaches.

Paper Details

Date Published: 19 August 2008
PDF: 8 pages
Proc. SPIE 7096, Adaptive Coded Aperture Imaging and Non-Imaging Sensors II, 709609 (19 August 2008); doi: 10.1117/12.805372
Show Author Affiliations
Chris W. Slinger, QinetiQ Malvern (United Kingdom)
Kevin Gilholm, QinetiQ Malvern (United Kingdom)
Neil Gordon, QinetiQ Malvern (United Kingdom)
Mark McNie, QinetiQ Malvern (United Kingdom)
Doug Payne, QinetiQ Malvern (United Kingdom)
Kevin Ridley, QinetiQ Malvern (United Kingdom)
Malcolm Strens, QinetiQ Malvern (United Kingdom)
Mike Todd, QinetiQ Malvern (United Kingdom)
Geoff De Villiers, QinetiQ Malvern (United Kingdom)
Philip Watson, QinetiQ Malvern (United Kingdom)
Rebecca Wilson, QinetiQ Malvern (United Kingdom)
Gavin Dyer, Goodrich ISR Systems (United States)
Mike Eismann, Air Force Research Lab. (United States)
Joe Meola, Air Force Research Lab. (United States)
Stanley Rogers, Air Force Research Lab. (United States)

Published in SPIE Proceedings Vol. 7096:
Adaptive Coded Aperture Imaging and Non-Imaging Sensors II
David P. Casasent; Stanley Rogers, Editor(s)

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