Digital compass and magnetometer having a sensor coil wound on a

Details Digital compass and magnetometer having a sensor coil wound on a Digital compass and magnetometer having a sensor coil wound on a

1987-07-02

1989-07-25

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Magnetometers

324260, G01R 3302

Patent

active

048517755

ABSTRACT:
A digital compass (20) has a sensing coil (60) wound on an elongated strip of high direct current permeability magnetic material. The sensing coil (60) is connected to a sensing circuit (56). The sensing coil and sensing circuit are responsive to the Earth's magnetic field to provide an oscillating signal at an output (28) of the sensing circuit (56) which varies in frequency with orientation of the at least one sensing coil (60) with respect to the Earth's magnetic field. A microprocessor (36) is connected to receive information inputs from the oscillating signal. The microprocessor converts the information inputs to an indication of orientation of the sensing coil with respect to the Earth's magnetic field based on the frequency of the oscillating signal. A display (52) receives the orientation indication from the microprocessor.

REFERENCES:
patent: 3416072 (1968-12-01), Fussell et al.
patent: 3936949 (1976-02-01), Devaud
patent: 4182987 (1980-01-01), Moeller
patent: 4241317 (1980-12-01), Breitling
patent: 4305034 (1984-12-01), Long et al.

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