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A novel radiometric all-sky infrared camera [RASICAM] has been constructed to allow automated real-time quantitative
assessment of night sky conditions for the Dark Energy Camera [DECam] located on the Blanco Telescope at the Cerro
Tololo Inter-American Observatory in Chile. The camera is optimized to detect the position, motion and optical depth of
thin, high (8-10km) cirrus clouds and contrails by measuring their apparent temperature above the night sky background.
The camera system utilizes a novel wide-field equiresolution catadioptic mirror system that provides sky coverage of 2π
azimuth and 14-90° from zenith. Several new technological and design innovations allow the RASICAM system to
provide unprecedented cloud detection and IR-based photometricity quantification. The design of the RASICAM system
is presented.
Peter M. Lewis,Howard Rogers, andRafe H. Schindler
"A radiometric all-sky infrared camera (RASICAM) for DES/CTIO", Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77353C (19 July 2010); https://doi.org/10.1117/12.856483
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Peter M. Lewis, Howard Rogers, Rafe H. Schindler, "A radiometric all-sky infrared camera (RASICAM) for DES/CTIO," Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77353C (19 July 2010); https://doi.org/10.1117/12.856483