Abstract
The Kirchhoff waveguide theorem provides an adequate description of an electrodynamic system of a high-sensitivity microwave radiometer with wideband detector. A transition from the general analytical representation of this theorem to a particular case is analyzed. This transition is equivalent to a transition from the Planck distribution to the Rayleigh-Jeans approximation. A simple relationship is derived that determines, for a preset accuracy, the high-frequency boundary for the above transition as a function of the temperature.
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Translated from Zhurnal Tekhnichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Fiziki, Vol. 70, No. 7, 2000, pp. 141–142.
Original Russian Text Copyright © 2000 by Semin.
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Semin, I.A. High-frequency boundary for the Rayleigh-Jeans approximation in microwave radiometry problems. Tech. Phys. 45, 953–954 (2000). https://doi.org/10.1134/1.1259758
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DOI: https://doi.org/10.1134/1.1259758