Accession Number : AD0837179

Title :   RF BRIDGE ELECTRICAL CONDUCTIVITY GAUGE FOR RMP-B VEHICLE.

Descriptive Note : Rept. for Aug 67-Feb 68,

Corporate Author : AEROSPACE CORP EL SEGUNDO CA LAB OPERATIONS

Personal Author(s) : McPherson, Donald A. ; Gibb, O. Lloyd ; Harbridge, Wallace B. ; Fuhs, Allen E.

Report Date : JUN 1968

Pagination or Media Count : 46

Abstract : The Reentry Measurements Instrument Package (RMIP) on the Reentry Measurements Vehicle (RMV) is designed to measure properties of the boundary layer and wake for a sharp nosed, slender body. One of the experimental instruments is an rf bridge that measures the dc conductivity of the plasma sheath formed about the vehicle. Because conductivity is directly proportional to electron density, knowledge of the electron-neutral collision frequency is sufficient to determine the electron density from the conductivity. For the RMP-B vehicle, it is expected that the conductivity will be in the range 0.3 to 1.0 mho/m for a refrasil heat shield with 50 ppm Na or equivalent contaminants. The conductivity meter was designed with a dynamic range of 0.1 to 10.0 mho/m. The system study providing design criteria is reviewed. Detailed operational information on instrument performance is presented. (Author)

Descriptors :   (*REENTRY VEHICLES, PLASMA SHEATHS), (*PLASMA SHEATHS, ELECTRICAL CONDUCTIVITY), MEASUREMENT, ELECTRIC BRIDGES, ELECTRON DENSITY, SLENDER BODIES, ATMOSPHERE ENTRY, BOUNDARY LAYER, RELIABILITY(ELECTRONICS), NOSE CONES, WAKE, CALIBRATION.

Subject Categories : Test Facilities, Equipment and Methods
      Guided Missiles
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE