Xs-Band Microwave Interferometer for Study of Hypersonic Turbulent Wake on Range 5
Abstract
As part of a research program aimed at determining the behavior of the mean and fluctuating charge density levels in an ionized turbulent wake, a dual channel microwave interferometric equipment operating at Xs-Band has been installed on the hypersonic Range 5 facility at Defence Research Establishment, Valcartier (DREV) to provide an independent estimate of the mean electron density. Resolution of the order of 2 inches is provided by a double-lens focussing system, installed about the projectile line-of-flight. The present report describes in detail the horn-lens system, the transmission and receiving systems, and the calibration and analysis procedures. The analysis employed here goes somewhat beyond the conventional ballistic range practice of quoting a result indicative of the integration of a somewhat arbitrary electron density over an equally indefinite path length. Instead, on the basis of an assumed gaussian electron density distribution in the wake, the two measurements made with the dual channel equipment are used to infer both the amplitude and the width parameters of the assumed distribution function as a function of time or axial distance behind the projectile. Typical results are presented for the case of 2.7 inch diameter spheres flown at 14,500 feet/second in air
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1972
- Accession Number
- ADA637601
Entities
People
- A. Fitchett
- D. Heckman
- N. Gagne