LWIR pupil imaging and prospects for background compensation

Paul LeVan; Ünal Sakoglu; Mark Stegall; Greg Pierce

doi:10.1117/12.2190354

28 August 2015 LWIR pupil imaging and prospects for background compensation

Paul LeVan, Ünal Sakoglu, Mark Stegall, Greg Pierce

Author Affiliations +

Proceedings Volume 9609, Infrared Sensors, Devices, and Applications V; 96090U (2015) https://doi.org/10.1117/12.2190354
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

Abstract

A previous paper described LWIR Pupil Imaging with a sensitive, low-flux focal plane array, and behavior of this type of system for higher flux operations as understood at the time. We continue this investigation, and report on a more detailed characterization of the system over a broad range of pixel fluxes. This characterization is then shown to enable non-uniformity correction over the flux range, using a standard approach. Since many commercial tracking platforms include a “guider port” that accepts pulse width modulation (PWM) error signals, we have also investigated a variation on the use of this port to “dither” the tracking platform in synchronization with the continuous collection of infrared images. The resulting capability has a broad range of applications that extend from generating scene motion in the laboratory for quantifying performance of “realtime, scene-based non-uniformity correction” approaches, to effectuating subtraction of bright backgrounds by alternating viewing aspect between a point source and adjacent, source-free backgrounds.

Citation Download Citation

Paul LeVan, Ünal Sakoglu, Mark Stegall, and Greg Pierce "LWIR pupil imaging and prospects for background compensation", Proc. SPIE 9609, Infrared Sensors, Devices, and Applications V, 96090U (28 August 2015); https://doi.org/10.1117/12.2190354

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