Trapezoidal coil configuration for metal detector in the shape o

Details Trapezoidal coil configuration for metal detector in the shape o Trapezoidal coil configuration for metal detector in the shape o

1975-01-02

1976-04-13

Corcoran, Robert J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

340258C, G01R 3300

Patent

active

039506967

ABSTRACT:
The invention relates to a trapezoidal, ladder-type coil configuration positioned as an inverted U to provide a passage thereunder for use in conjunction with magnetic field generating and magnetic field measuring circuitry to detect the presence of metal devices associated with objects, i.e., parcels or persons, passing through the passage. The ladder configuration of the coil establishes magnetic fields within the passage which exhibit sufficiently strong components in three orthogonal directions (x, y and z) to assure detection of metal devices regardless of the orientation of the metal devices.

REFERENCES:
patent: 2147746 (1939-02-01), Luck et al.
patent: 2338793 (1944-01-01), Zuschlag
patent: 3588685 (1971-06-01), Fallenius
patent: 3697972 (1972-10-01), Brown

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