Accession Number : AD0777885

Title :   A Digital Offset Fluxgate Magnetometer for Use in Remote Geomagnetic Observatories,

Corporate Author : CALIFORNIA UNIV LOS ANGELES INST OF GEOPHYSICS AND PLANETARY PHYSICS

Personal Author(s) : Power,James J.

Report Date : 20 SEP 1973

Pagination or Media Count : 93

Abstract : The circuit design of a completely automatic fluxgate magnetometer is presented. The instrument is designed to measure the magnitude and direction of the local field vector at the observatory over a dynamic range of plus or minus 65,500 gamma with a resolution of 0.1 gamma. Design goals for the uncertainty in the zero offset of the sensor and noise level of the sensor are less than 1 gamma and 0.1 gamma peak to peak, respectively. The ring core fluxgate sensors are constructed using commercially available nickel alloy magnetic cones. The electronics of each axis contain two null feedback circuits. The fine feedback system with a dynamic range of plus or minus 64 gamma establishes the fundamental resolution and frequency response of the instrument. A digital offset feedback system maintains the ambient field along the sensor axis within the dynamic range of the fine system by automatic application of an appropriate number of discrete steps of 64 gamma. (Modified author abstract)

Descriptors :   *Magnetometers, *Geomagnetism, Automatic, Digital systems, Systems engineering, Magnetosphere

Subject Categories : Atmospheric Physics
      Geomagnetism
      Magnetic & Electric Fld Detection & Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE