The temperature effects on the attenuation of K-band microwaves at a frequency of 26,500+30 megacycles per second through natural-gas and propane flames containing added alkali halide salts were investigated over a temperature range from 1900° to 2500° K. The preliminary data of this investigation indicated that the attenuation varied appreciably with the sodium-line-reversal temperatures of the flames and was inde¬pendent of the particular hydrocarbon fuels that were used for tempera¬ture sources and of the particular halide components of the compounds used, in the concentrations employed to produce easily measurable attenu¬ation. A reproducibility of ±25° K was obtained.
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