Abstract

An extensive investigation of a vortex-stabilized arc radiation source has been made in which arc current, gas pressure, gas flow rate, and nozzle diameter were the prime variables. Both the total radiance and spectral distribution were measured. Within the experimental range investigated with argon as the arc gas, the radiance is proportional to the 1.6 power of the current, the 0.4 power of the pressure, and the 0.35 power of the gas flow rate and is inversely proportional to the 2.6 power of the nozzle diameter. The total radiance and spectral distribution are primarily functions of gas composition. Argon had the highest total radiance with a substantial radiation continuum and a superimposed broad line structure. Helium exhibited primarily a sharp line structure. Oxygen, air, and nitrogen had a substantial portion of radiant energy in the infrared. The maximum source radiance obtained with a vortex-stabilized argon arc was 5250 W cm−2 sr−1.

© 1965 Optical Society of America

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