SPECTROSCOPIC DETERMINATION OF TEMPERATURE IN A POTASSIUM-SEEDED AIR PLASMA
Abstract
Spectroscopic measurements of radial electron excitation temperature distributions were made at the exit of a seeded, 2-mw arc heater. A nitrogen- oxygen mixture (about 3:1 in mass flow) was seeded with potassium carbonate. Potassium I lines were used in the determination of temperature by the ratio method. A modification to the ratio method was devised so that two different lines, observed under different conditions, could be correctly employed in the ratio method. The experimentally determined temperature profiles were nearly uniform across the plasma stream but varied in magnitude from run to run. Relative potassium I atom concentrations were nonuniform, but nearly radially symmetric, and exhibited an off-axis peak.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1970
- Accession Number
- AD0700982
Entities
People
- J. W. Gearhart
Organizations
- Arnold Engineering Development Complex