Measurement of the Radiative Properties of Air at High Temperatures and Pressures

摘要

Steady air columns near 10,000 K and at pressures from 1 to 30 atm were studied spectroscopically from the side in emission and absorption experiments. Argon columns were used in auxiliary experiments. At 30 atm the effects of self-absorption within the air arc were treated along with corrections for absorption by the oxides of nitrogen in the environment surronding the arc. Temperature profiles deduced from Abel-inverted emission data on the OI 844.6 nm and the NI 862.9 nm lines and corrected for the absorption effects are in excellent agreement. Laser transmission experiments at 632.8 nm show that ray refraction in the arc and its boundaries warrants attention at 30 atm in experiments in which intensities are being measured. A number of observations relating to work at still higher pressures were made. (Author)