Tuning fork magnetometer
First Claim
1. Apparatus comprising:
- a tuning fork having first and second tines,a first magnet disposed on said first tine, anda second magnet disposed on said second tine,wherein said magnets have anti-parallel magnetic moments, said tines are elongated in a particular direction, and said anti-parallel magnetic moments are oriented essentially along said direction.
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Accused Products
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.
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Citations
10 Claims
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1. Apparatus comprising:
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a tuning fork having first and second tines, a first magnet disposed on said first tine, and a second magnet disposed on said second tine, wherein said magnets have anti-parallel magnetic moments, said tines are elongated in a particular direction, and said anti-parallel magnetic moments are oriented essentially along said direction. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A magnetometer comprising:
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a vacuum enclosure, apparatus having a resonant frequency, said apparatus being disposed within said enclosure and including a piezoelectric tuning fork having first and second tines, each of said tines having a surface on a free end thereof, a first permanent magnet disposed on said free end surface of said first tine, a second permanent magnet disposed on said free end surface of said second tine; said tines being elongated in a particular direction and said magnets having anti-parallel magnetic moments that are oriented essentially along said direction, a drive circuit for causing said apparatus to oscillate at or near said resonant frequency, a detection system of sensing magnetic-field-induced changes in the frequency, amplitude or phase of said oscillation caused by the presence of a magnetic field having at least a component oriented parallel to the imaginary line joining the ends of said tines.
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9. A method comprising the steps of:
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locating apparatus in a magnetic field, the apparatus including 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, Wherein said magnets have anti-parallel magnetic moments, said lines are elongated in a particular direction, and said anti-parallel magnetic moments are oriented essentially along said direction, causing the apparatus to oscillate at or near its resonant frequency, and detecting magnetic-field-induced changes in a parameter of the oscillation. - View Dependent Claims (10)
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Specification