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28 August 2015 LWIR pupil imaging and prospects for background compensation
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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.
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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);

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