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Resonator techniques for precise measurements of gazes and condensed media in wide frequency range from 40 GHz up to 500 GHz and in the temperature interval from 4 K up to 900 K are presented. The measurement methods are the absolute ones and self “calibrated” it means that it is not necessary to use the prior information. Concrete values are(More)
We present the results of theoretical and experimental studies of the reflectivity of metals at cryogenic temperatures in the millimeter wavelength range. High-Q Fabry-Perot resonators operated at a temperature of 4-300 K in the frequency range 150-250 GHz are used for the experimental study. Silver, copper, gold, aluminum, and beryllium reflectors with(More)
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