Electricity: measuring and testing – Particle precession resonance – Using optical pumping or sensing device
Patent
1987-06-17
1989-03-21
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using optical pumping or sensing device
324301, G01R 3326
Patent
active
048147079
ABSTRACT:
A scalar magnetometer with vector capabilities includes a cell containing .sup.3 He gas at a pressure between 0.05 Torr and 100 Toor. The cell is energized by an oscillator which partially ionizes the .sup.3 He gas. Metastable atoms are polarized and consequently ground state atoms are polarized with a radiation source. A pair of Helmholtz coils provides a small uniform magnetic field which initiates a precession of the polarized .sup.e He atoms by forcing their misalignment with the magnetic field to be measured. The angular velocity of the precession is proportional to the strength of the field. A voltage is induced in a plurality of coils that are mounted on the axes of the cell. The induced voltage provides vector information for identifying the angular position of the cell relative to the magnetic field being measured.
REFERENCES:
patent: 3103621 (1963-09-01), Fraser
patent: 3714552 (1973-01-01), Hirschel
patent: 4567439 (1986-01-01), McGregor
Comfort James T.
Romano Ferdinand M.
Sharp Melvin
Texas Instruments Incorporated
Tokar Michael J.
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