Tuning fork magnetometer

Details Tuning fork magnetometer Tuning fork magnetometer

2006-06-26

2010-11-09

Aurora, Reena (Department: 2858)

Electricity: measuring and testing

Magnetic

Magnetometers

Reexamination Certificate

active

07830142

ABSTRACT:
Apparatus comprises a tuning fork having first and second tines, a first magnet disposed on the first tine, and a second magnet disposed on the second tine. In one embodiment the magnets comprise permanent magnets; in another they comprise electromagnets. In a preferred embodiment the magnets have magnetic moments oriented essentially parallel to the axis of the tines and anti-parallel to one another. In operation, the apparatus is made to oscillate at or near its resonant frequency, and in the presence of a magnetic field a parameter of the oscillation (e.g., its frequency, phase or amplitude) is altered in a fashion that allows the magnitude or direction of the magnetic field to be determined. In a preferred embodiment, the tuning fork is disposed within a vacuum enclosure, which increases the Q of the apparatus.

REFERENCES:
patent: 3506897 (1970-04-01), Clifford
patent: 5214279 (1993-05-01), Hakamata
patent: 5698784 (1997-12-01), Hotelling et al.
R. D. Grober et al., “Fundamental limits to force detection using quartz tuning forks,”Rev. Sci. Instrum., vol. 71, No. 7, pp. 2776-2780 (Jul. 2000).
Edmund Scientifics, “Samarium Cobalt (SmCo),” product pp. 1-2, found at URL http://scientificsonline.com and available or before Oct. 18, 2005.
C. A. Bolle et al., U.S. Appl. No. 11/250,123, filed Oct. 13, 2005.

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