Accession Number:

AD0274568

Title:

THE DEVELOPMENT OF THE ELECTRIC FIELD METER FOR THE EXPLORER VIII SATELLITE (1960)

Descriptive Note:

Corporate Author:

NATIONAL AERONAUTICS AND SPACE ADMINISTRATION WASHINGTON D C

Personal Author(s):

Report Date:

1962-04-01

Pagination or Media Count:

1.0

Abstract:

The electric field meter EFM was one of the sensors flown in the Explorer VIII satellite launched on November 3, 1960. The EFM, located on the spin axis of the payload, was designed to measure the strength of the electrostatic field caused by the ion sheath surrounding the satellite. Since the sensor required dc motor elements to operate in an ionospheric vacuum, methods were sought to avoid the catastrophic wear rate of standard commercial commutator brushes and ball bearings in a vacuum environment. After an extensive test program, goldplated stainless steel ball bearings and carbon brushes with a molybdenum disulphide core lubricant were used in the EFM flight units. By using these special components, an EFM was developed with a life expectancy exceeding that of the battery power available. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE