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Monitoring earth surface temperature field in IR band

Keywords:

V. P. Nesterov – Ph.D. (Eng.), Senior Research Scientist, JSC «Concern «Vega»
P. S. Kiselev – Deputy Head of Department , JSC “Vnukovo Aircraft Repair Plant"


Lately, spectral electromagnetic radiation sensors have been widely used for the remote sensing of the Earth and its atmosphere. In this case, the Earth surface temperature is determined by the results of measuring reflected radiation of calibrated radiator installed on a carrier board according to the procedures including weather conditions, the sun and the air conditions. As a rule, in practice, the air survey is performed in atmosphere saturated with aerosols. A small amount of aerosol (e.g., smoke from stack, change of moisture content in atmosphere, dust whirlwinds etc.) can cause a noticeable distortion in radiation intensity approaching scanner installed on the aircraft. When the atmospheric composition is known, the atmospheric absorption can be calculated by the known ways (aggregate method, «Loutran» method, etc.). When the atmospheric composition is unknown or known, but the function of atmospheric change along the survey route is unknown and there is an aerosol in the atmosphere, the attenuation of radiation, that reached electromagnetic radiation sensor, can not be practically calculated. Thus, the terrain image is an image of flux intensities of electromagnetic radiation reached the radiation sensor, but not a thermal field picture of the observed surface. To perform a thermal field imaging, the wave frequency, at which more quantity of radiation energy comes to maximum operating level, should be used, i.е. the monitoring facility operation principle is to be based on the Wien displacement law. The article shows a flow-diagram of the Earth surface monitoring facility, the operation principle of which is based on the Wien displacement law. The article describes an example how to calculate the said monitoring facilities for a case of unknown function in water vapor amount change along the survey route.
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June 24, 2020
May 29, 2020

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