Accession Number : ADA182620

Title :   Flow-Field Instrumentaion Development.

Descriptive Note : Technical rept. 26 Sep 84-30 Sep 86,

Corporate Author : SRI INTERNATIONAL MENLO PARK CA

Personal Author(s) : Burns,Alan A

PDF Url : ADA182620

Report Date : 30 Aug 1986

Pagination or Media Count : 140

Abstract : Equipment was assembled to make two new types of measurements of quantities important for describing shock wave effects in a dusty environment. The first of these employs a novel technique combining millimeter wave (mmW) rf phase shift and X ray absorption measurements to obtain fluctuations in air and dust densities in the shock wave. Use of either an X ray or rf technique above leads only to a weighted sum of air and dust densities. The second new technique uses the reflection of microwave signals from the bottom side of the soil surface to measure surface recession because of shock wave passage. This technique exploits the phenomenon of total internal reflection at a material interface. This report describes the techniques, the equipment, calibration, test results, problems encountered, and corrective actions. Results from the installation of the mmW/X-ray equipment at MINOR SCALE are described in an Appendix; these are believed to be the first reported simultaneous measurements of air and dust density in a shock front.

Descriptors :   *DUST, *SHOCK WAVES, *AIR, DENSITY, INTERNAL REFLECTION, MILLIMETER WAVES, PHASE SHIFT, RADIOFREQUENCY, CALIBRATION, INTERFACES, MATERIALS, SHOCK TUBES, RADIATION ABSORPTION, NUCLEAR EXPLOSION SIMULATION, MEASUREMENT, SYNCHRONISM, X RAYS, X RAY APPARATUS, SOILS, SURFACES

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE