Accession Number : AD0286046

Title :   MICROWAVE DIAGNOSTICS IN THE SHOCK TUBE

Corporate Author : ARMY RESEARCH OFFICE WASHINGTON D C

Personal Author(s) : Tevelow ,F. L. ; Curchack,H. D.

Report Date : DEC 1962

Pagination or Media Count : 1

Abstract : A microwave bridge circuit is used to determine the electromagnetic properties of shock heated gas. The ionized gas passes through slots in x-band waveguide and time-resolved attenuation and phase velocity constants are determined. Electron density, collision frequency, complex dielectric constant, propagation constant, and reflection coefficient can be computed from the measurements. In another experiment, the microwave noise power emitted by the plasma is observed by displaying the amplified detected output on an oscilloscope. The radiated noise power can be related to the electron temperature. The same geometry of microwave test section in the shock tube is used in both the propagation and noise power experiments. Results of the propagation experiment are presented. Some preliminary results of the noise radiated by argon plasma and propagation data for Ms7.6 and 8.7 shocks in argon are also given. (Author)

Descriptors :   *MICROWAVE NETWORKS, *MICROWAVES, *PLASMAS(PHYSICS), *SHOCK TUBES, *WAVEGUIDES, ATTENUATION, ELECTROMAGNETIC PROPERTIES, ELECTRONS, GAS IONIZATION, OSCILLOSCOPES, PHASE SHIFT CIRCUITS, PROPAGATION, THEORY, WAVEGUIDE SLOTS

Distribution Statement : APPROVED FOR PUBLIC RELEASE