A Magnetometer Data Acquisition System
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
Pagination or Media Count:
A system for the analysis of geomagnetic and gradient noise is described. The nominal 176 kHz Larmor frequency output of an optically pumped cesium magnetometer is mixed to a frequency in the 1.2 kHz range and FM tape recorded. The recorded output is applied to a periodmeter, the digital output of which is input to the XDS-9300 computer for analysis and display. The absolute accuracy of the period measurement is .75 microsec with a resolution of .25 microsec. The RMS noise of the tape recorder was determined to be .667 microsec or in the operating frequency range less than 1 Hz or .28 gamma. Externally introduced field disturbances as small as .5 gamma were recorded and displayed, and the response time of the magnetometer determined to be less than 2.5 msec.
- Test Facilities, Equipment and Methods
- Magnetic and Electric Field Detection and Detectors