Magnetometers for detecting metallic objects in earth's magnetic

Details Magnetometers for detecting metallic objects in earth's magnetic Magnetometers for detecting metallic objects in earth's magnetic

1985-07-29

1987-06-23

Karlsen, Ernest F.

Electricity: measuring and testing

Magnetic

Magnetometers

324345, G01R 3302, G01V 308, G01V 300

Patent

active

046756060

ABSTRACT:
A passive system for detecting the position and trajectory of a moving body, moving in the air, on the ocean or below the ocean. This apparatus operates by detecting perturbations in the earth's magnetic field responsive to the movement of a body through the field. At least two spaced magnetometers are provided to detect the perturbations of the earth's magnetic field, whereas, the system works more efficiently with an array of sensors. These two sensors are used to filter out the ambient noise. The outputs of these sensors are digitized and inverted through correlation procedures and an output is provided on a display.

REFERENCES:
patent: 2406870 (1946-09-01), Vacquier
patent: 2415808 (1947-02-01), Buckley
patent: 2519094 (1950-08-01), Zuschlag
patent: 2549845 (1951-04-01), Mouzon et al.
patent: 3324385 (1967-06-01), Hings
patent: 3644825 (1972-02-01), Davis, Jr. et al.
patent: 4309659 (1982-11-01), Yoshii

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