Electricity: measuring and testing – Particle precession resonance – Using optical pumping or sensing device
Patent
1983-09-23
1986-01-28
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using optical pumping or sensing device
324301, G01R 3308
Patent
active
045674396
ABSTRACT:
An apparatus for measuring the magnitude of a magnetic field in one embodiment includes a .sup.3 He cell having an oscillator connected thereto for producing an electrical discharge for metastable .sup.3 He atoms, a .sup.4 He lamp having an oscillator connected thereto for producing .sup.4 He radiation and an optical path to the .sup.3 He cell including a lens for collimating the .sup.4 He radiation and a circular polarizer. The imaged .sup.3 He atoms and .sup.4 He radiation interact to magnetize a portion of the .sup.3 He atoms in a direction parallel to the direction of the ambient magnetic field. After the cell magnetization, an oscillatory magnetic field normal to the ambient field is established by coils connected to a frequency synthesizer which is scanned over a frequency interval including the free precession (Larmor) frequency. This action rotates the direction of magnetization of the .sup.3 He cell atoms from parallel to the ambient magnetic field to approximately perpendicular to the ambient magnetic field. The cell then is allowed to precess freely and an a.c. is induced in a coil during precession. The a.c. is connected to a frequency discriminator which may be a digital type to digitize the voltage representative of the frequency of the a.c. A very narrow band digital filter filters the digitized output of the discriminator and a digital to analog converter produces a voltage from the digital filter output for a charge recorder for charting.
REFERENCES:
patent: 3380632 (1967-10-01), Robinson
patent: 3728612 (1973-04-01), Hearn
Bandy Alva H.
Heiting Leo N.
Sharp Melvin
Texas Instruments Incorporated
Tokar Michael J.
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