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27 December 1995 Development and qualification of the conveyable thermal infrared field radiometer CLIMAT
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The radiometer CLIMAT is a highly sensitive field instrument designed for multispectral thermal infrared measurements. Ground-based measurements can be performed. but the instrument has capabilities for operating from aircraft or balloon. The optics consist of an objective lens and a condenser mounted according to the Koehler principle to provide uniform irradiation over the detector surface. The radiometric signal is treated by a fast thermopile detector characterized by a low noise and a very weak temperature dependence of its responsivity. The managing system allows either manual or automated measurements. The energy consumption of the instrument is optimized for a maximum autonomy. The optical and electrical units of the instrument are described. Different experimental studies for measuring the sensitivity accuracy, spectral characteristics, thermal behavior and, field of view of the instrument are described. The instrument is dedicated to ground and vegetation on the one hand. and on the other hand, clouds and atmospheric soundings. The radiometer is also designed for calibrations or analyses of satellite radiometry data. Some atmospheric measurements obtained with a prototype are presented. Prospects are the development and the qualification of a narrow field-of-view instrument adapted to inhomogeneous targets such as cirrus clouds. A 3.7-tim channel and an internal blackbody are under study.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Christophe M. Pietras, Martial P.A. Haeffelin, Michel Legrand, Gerard Brogniez, Nader Khalil Abuhassan, and Jean Pierre Buis "Development and qualification of the conveyable thermal infrared field radiometer CLIMAT", Proc. SPIE 2578, Passive Infrared Remote Sensing of Clouds and the Atmosphere III, (27 December 1995);


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