Accession Number : AD0266686

Title :   MICROWAVE MEASUREMENTS OF PLASMA FLOW IN A SUPERSONIC WIND TUNNEL

Corporate Author : UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES ENGINEERING CENTER

Personal Author(s) : OSHIMA,KOICHI

Report Date : SEP 1961

Pagination or Media Count : 1

Abstract : A 24 kilomegacycle microwave interferometer is used to measure the density and the collision frequency of electrons in a plasma flow in a small supersonic wind tunnel, heated by 13 megacycle radio-frequency power supply. By means of slabs and strips of known dielectric properties, the characteristics of microwave interaction with the tunnel filled with the dielectrics is examined, and it is confirmed that the measured phase shift agrees with the predicted one. Results are obtained for a stable plasma flow, and they show reasonable values. The unstable plasma flow, which usually occurs at high input power and at low pressures, cannot be measured. (Author)

Descriptors :   *GAS IONIZATION, *PLASMAS(PHYSICS), DENSITY, DIELECTRICS, ELECTRONS, GAS FLOW, HYPERSONIC FLOW, INDUCTION HEATING, INTERFEROMETERS, MEASUREMENT, MICROWAVE EQUIPMENT, MICROWAVES, PARTICLES, POWER SUPPLIES, RADIOFREQUENCY POWER, SUPERSONIC WIND TUNNELS

Distribution Statement : APPROVED FOR PUBLIC RELEASE