16 June 1997 Design and analysis of a small bispectral infrared push broom scanner for hot spot recognition
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Abstract
A Small Bispectral Infrared Detection (BIRD) push broom scanner for a small satellite mission is described, which is dedicated to the detection and analysis of high temperature events (HTE). Current operating and planned satellite sensors are not designed for high temperature event observation and therefore show some serious drawbacks such as saturation of the IR channels for target temperatures higher than 50 degree(s)C, low spatial resolution in case of daily coverage, low coverage of spatially high resolving systems, or not adequate IR channels. The BIRD instrumentation is a first attempt to overcome these disadvantages. For this purpose two infrared line scanners (3.4 - 4.2 micrometers and 8.5 - 9.3 micrometers ) will be combined with a Wide Angle Stereo Scanner in the visible. Because of the limited resources of a small satellite the design of all instruments is based on the usage of staring focal plane arrays. To observe HTE directly the covered sounding area should be as large as possible whereas at first glance the ground resolution of the sensor should be in order of some 10 m. These demands are in contradiction with the number of the infrared detector array elements currently available. For this reason methods of subpixel target detection and analysis have to be used. According to this concept a combination of the data from at least two radiometric high sensitive infrared sensor channels will be used to compensate the lack of high ground resolution. Adding to the infrared camera a suitable CCD-line scanner for a pre- classification with a higher ground resolution, an markedly improvement can be achieved.
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Eckehard Lorenz, Wolfgang Skrbek, Herbert Jahn, "Design and analysis of a small bispectral infrared push broom scanner for hot spot recognition", Proc. SPIE 3063, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing VIII, (16 June 1997); doi: 10.1117/12.276078; https://doi.org/10.1117/12.276078
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