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13 August 1993 All-sky infrared cloud clutter analysis
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An infrared all-sky mapper Scorpio has been developed at TNO-FEL. This system operates in the 3 - 5 micrometers and 8 - 13 micrometers wavelength bands. With its reflective optics system it scans a useful area of 340 degree(s) in azimuth and from -18 degree(s) up to +72 degree(s) in elevation with a resolution of 0.8 mrad. The system is calibrated during each revolution in an absolute way with the use of a temperature-controlled bar. The dynamic range is from -100 degree(s)C up to +300 degree(s)C. The mapper is used to obtain calibrated infrared images of the sky (primarily at 10 micrometers ) in an on-going study for statistical properties of the sky and cloud infrared radiation, i.e. infrared clutter and cloudiness. Scorpio is also useful for more general cloud and sky background studies. All-sky images are presented together with vertical profiles in empty and cloudy sky regions which are compared with Lowtran7 predictions of radiance, and meteorological cloud measurements. A description and analysis of the clutter analysis based on image cells is given. Images of RMS clutter are presented.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Piet B. W. Schwering and A. C. Kruseman "All-sky infrared cloud clutter analysis", Proc. SPIE 1967, Characterization, Propagation, and Simulation of Sources and Backgrounds III, (13 August 1993);


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