MWIR FPA control for optimal NETD

Johan W. Viljoen; Tristan M. Goss; Cornelius J. Willers

doi:10.1117/12.2501306

24 January 2019 MWIR FPA control for optimal NETD

Johan W. Viljoen, Tristan M. Goss, Cornelius J. Willers

Proceedings Volume 11043, Fifth Conference on Sensors, MEMS, and Electro-Optic Systems; 110430A (2019) https://doi.org/10.1117/12.2501306
Event: Fifth Conference on Sensors, MEMS, and Electro-Optic Systems, 2018, Skukuza, South Africa

Abstract

The focal plane array in an MWIR camera should be configured optimally in terms of readout mode, stare time and gain setting to achieve the best (minimum) noise levels and/or maximal usable dynamic range under variable environmental conditions. In a long-range observation system noise is normally dominated by the environment, with optical contributions due to ambient illumination, target and background radiance, atmospheric transmission, path radiance, optics transmission and optics radiance. This optical signal is then detected according to the FPA spectral responsivity, which, combined with electronic contributors such as read noise, amplifier noise, clock noise, and quantization noise, eventually result in a digital output signal. A complete radiometric system modelling approach is used to predict the system NETD under a variety of representative environmental conditions and target ranges, which can then be used to inform decisions regarding the selection of the detector readout mode and gain mode, as well as setting the stare time for best operational performance. Results are presented demonstrating the effects of the various environmental factors and system parameters on NETD.

Citation Download Citation

Johan W. Viljoen, Tristan M. Goss, and Cornelius J. Willers "MWIR FPA control for optimal NETD", Proc. SPIE 11043, Fifth Conference on Sensors, MEMS, and Electro-Optic Systems, 110430A (24 January 2019); https://doi.org/10.1117/12.2501306

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KEYWORDS

Atmospheric optics

Sensors

Mid-IR

Signal detection

Staring arrays

Atmospheric modeling

Cameras

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