Magnetic field measurement system and optical pumping...

Details Magnetic field measurement system and optical pumping... Magnetic field measurement system and optical pumping...

2006-11-28

2010-02-02

LeDynh, Bot L (Department: 2858)

Electricity: measuring and testing

Magnetic

Magnetometers

C324S248000, C324S304000, C600S409000, C505S162000, C505S846000

Reexamination Certificate

active

07656154

ABSTRACT:
Provided is a highly accurate optical pumping magnetometer, in which a static magnetic field and an oscillating field to be applied to a vapor cell are stabilized. To this end, the optical pumping magnetometer includes: Helmholtz coils for applying a constant static magnetic field to a vapor cell serving as a magnetic field detector; fluxgate magnetometers for detecting environmental magnetic noise in two directions of X-axis direction and Y-axis direction other than Z-axis direction which is a direction for detecting a magnetic field coming out of a measurement object while locating the vapor cell in the center thereof; magnetometer drive circuits for driving the fluxgate magneotometers; current converters for converting outputs of the magnetometer drive circuits into amount of currents; and magnetic field generating coils for generating a magnetic field in a phase opposite to the environmental magnetic noise in the two directions.

REFERENCES:
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patent: 11-309122 (1999-11-01), None
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G.Bison, et al., a Laser-Punped Magnetometer for the Mapping of Human Cardiomagnetic Fields:, Appl. Phys. B 76, 325-328 (2003).
P. Schwindt, et al., “Chip-Scale Atomic Magnetometer”, Applied Physics Letters, vol. 85, No. 26, p. 6409 (2004).

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