Accession Number : ADA140024

Title :   A Probe for Measuring Spacecraft Surface Potentials Using a Direct-Gate Field Effect Transistor.

Descriptive Note : Final rept. 1 Apr 82-31 Aug 83,

Corporate Author : BOSTON UNIV MA

Personal Author(s) : Horenstein,M N ; Mavretic,A

PDF Url : ADA140024

Report Date : 30 Sep 1983

Pagination or Media Count : 170

Abstract : Experimental research aimed at the development of a solid state electrostatic field and surface potential sensor has been performed. The overall goal has been to obtain a sensor that overcomes the deficiencies of existing field sensors, including the need for mechanical moving parts and relatively high power consumption. As a result, both the Floating Gate Field Effect Transistor (FGFET) and Direct Gate Field Effect Transistor (DGFET) have been developed and tested. Both devices have been successfully used to measure electrostatic fields over extened periods of time on the order of hours, and a plausible theory for device behavior has been formulated and corroborated with experimental data. Device shortcomings include substantial sensitivity to temperature changes and to extraneous sources of light (DGFET). A moderate amount of random operating point drift has also been observed.

Descriptors :   *INSTRUMENTATION, *FIELD EFFECT TRANSISTORS, *SURFACE PROPERTIES, *ELECTROSTATIC FIELDS, *DETECTORS, *SPACECRAFT, SENSITIVITY, ENERGY CONSUMPTION, DRIFT, LIGHT SOURCES, HIGH POWER, SURFACES, FIELD EQUIPMENT

Subject Categories : Electrical and Electronic Equipment
      Test Facilities, Equipment and Methods
      Electricity and Magnetism
      Unmanned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE