Shielding arrangement for sensing the proximity of a metallic ob

Details Shielding arrangement for sensing the proximity of a metallic ob Shielding arrangement for sensing the proximity of a metallic ob

1975-03-12

1976-12-07

Corcoran, Robert J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 3, 336 84, G01R 3312

Patent

active

039965104

ABSTRACT:
A metal proximity sensor comprised of a housing having a sensing surface and a mounting surface opposite the sensing surface. The sensor is further comprised of a coil positioned within a cavity of a ferromagnetic pot core, wherein both components are positioned within the housing and adjacent the sensing surface. A ferromagnetic shield is provided for shielding the magnetic field, generated by the coil, from electromagnetic energy generated externally of the mounting surface of the housing. A second shield is comprised of a metal layer having a resistivity of less than 3.mu. ohm-centimeters for preventing the electromagnetic field, generated by the coil, from penetrating out of the sensor and through the mounting surface. The second shield is disposed between the first shield and the core. Finally, circuit means is provided for actuating an external load when a metal being detected passes near the sensing surface and through the magnetic field generated by the coil.

REFERENCES:
patent: 684065 (1949-09-01), Grossick
patent: 2550736 (1951-05-01), Tricebock
patent: 2810880 (1957-10-01), Buccicone
patent: 2945216 (1960-07-01), Gyger et al.
patent: 2958037 (1960-10-01), Riede et al.
patent: 3328680 (1967-06-01), Singer
patent: 3362002 (1968-01-01), Sedlak et al.
patent: 3371272 (1968-02-01), Stanton
patent: 3473110 (1969-10-01), Hardin et al.

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