Electricity: measuring and testing – Magnetic – Magnetic field detection devices
Patent
1997-10-03
1999-09-28
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Magnetic field detection devices
G01R 3302
Patent
active
059594527
ABSTRACT:
The invention consists, in one embodiment, of a resonator such as a conductive bar supported by two wires placed at the nodal points of the fundamental resonance frequency. The wires also supply current of this frequency to the resonator. In the presence of a magnetic field, the Lorentz force causes the resonator to vibrate. The amplitude of this vibration is proportional to a vector component of the magnetic field. The motion of the resonator is detected using one of a number of possible methods including optical beam deflection. The invention has a sensitivity of at least 1 nT, comparable to that of a commercial fluxgate magnetometer, and a dynamic range exceeding 80 dB.
REFERENCES:
patent: 2759102 (1956-08-01), Burns, Jr.
Givens Robert B.
Kistenmacher Thomas J.
Murphy John C.
Osiander Robert
Wickenden Dennis K.
Cooch Francis A.
Snow Walter E.
The Johns Hopkins University
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