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Proceedings Paper

MWIR sensor well fill: sources, effects and mitigation
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Paper Abstract

Detailed radiometric analysis has shown that 3-5 µm medium wave infrared (MWIR) staring array well fill quickly reaches very high percentages, once hot optics, path radiance and inefficient f-number matching are taken into account. Well fill values of 90% plus are not unheard of. Likewise, the sensor noise eats away at the sensitivity. Therefore, it would appear that the very small signals often sought might not get sufficient dynamic bit-range to describe small signal flux propagating through poor atmospheres. This work presents a very detailed real-world model that includes all known factors that might compete for the bit resolution in a digitized sensor signal. The effect of different scene temperatures, atmospheric conditions and sensor design characteristics are briefly investigated. The effect of the various well fill contributors are shown in relation to each other in order to build an understanding of the nature of the total well fill. Finally, some mitigation measures are described to limit the negative effects of undue large well fill.

Paper Details

Date Published: 3 February 2017
PDF: 16 pages
Proc. SPIE 10036, Fourth Conference on Sensors, MEMS, and Electro-Optic Systems, 1003616 (3 February 2017); doi: 10.1117/12.2244781
Show Author Affiliations
Cornelius J. Willers, Airbus DS Optronics (Pty) Ltd. (South Africa)
Tristan M. Goss, Airbus DS Optronics (Pty) Ltd. (South Africa)

Published in SPIE Proceedings Vol. 10036:
Fourth Conference on Sensors, MEMS, and Electro-Optic Systems
Monuko du Plessis, Editor(s)

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