RE-ENTRY COMMUNICATIONS STUDIES UTILIZING SEEDING TECHNIQUES.
Abstract
The object of this research was to determine the effects of chemical seedants on the electron concentration of an rf generated air plasma. 'Hot' and 'cold' uncontaminated air plasmas were generated by means of a 25 kW 1 Mc rf generator. A maximum electron density of 2 x 10 to the 12th power electrons/cc was obtained at a pressure of 0.37 torr and air flow of 7.5 x 0.00001 lb/sec. Water, 50% solution of water and ethanol, ethanol, and benzene were added in quantities from zero to 12, 6, 10 and 18% respectively by weight. A radial transmission line was used to measure the electron density and collision frequency. For the 'hot' plasma the results showed that a 1% by weight addition of the seedants reduced the electron concentration to approximately 50% of the original concentration and an addition of 6% reduced the concentration to 25% of the original value. No appreciable difference in electron reduction effects was observed for the four seedants on a weight basis. The electron reduction effects of the seedants in the zero to 1% by weight addition range was considerably greater than that predicted by the first law assuming complete dissociation of the seedant. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1965
- Accession Number
- AD0627796
Entities
People
- Brooks M. Sharp
- John H. Mullen
- Ralph A. Murphy
Organizations
- McDonnell Aircraft Corporation