大気圧アルゴン・プラズマからの放射について

概要

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The argon plasma jet at one atmospheric pressure has strongly emitted radiations from ultraviolet to infra-red zone. The measurements with spectrometer were performed to obtain the spectrum energy distribution for D. C. argon jet. The thermoelectric radiation probe was developed and radiant power from the jet was measured. Experiments were made at arc currents from 40 up to 160 A in argon gas flow rate of 10 1/min or 20 1/min. Radiation intensity mainly depended on arc currents and the strong radiation lay in the wavelength above 4200A^^°. Especially, the concentration of line spectrum was in the wavelength from 4200A^^°to 4400A^^° or 7900A^^° to 8100A^^°. As power input was increased, the wavelength to maximum intensity was moved to the shorter. Intensity depended on the distance (L) from nozzle exit : for L<4mm, the intensity decreased rapidly ; for 4mm<L<8mm, it maintained nearly constant ; for L>8mm, it decreased gradually. This result coincided with the spectroscopic measurements. The ratio of total radiant power to net power input increased monotonously and was about 10% above 1600 watt. From this result, therefore, the effective jet enthalpy was to be reduced.
山口大学の論文