Metal detector including a metal screening for producing a secon

Details Metal detector including a metal screening for producing a secon Metal detector including a metal screening for producing a secon

1995-05-02

1996-11-05

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324243, 324239, 324225, 340551, 340572, 336 84C, G01N 2772, H01F 2736, G01R 3312

Patent

active

055721214

ABSTRACT:
A metal detector comprise a coiled conductor located within a metal enclosure operative to provide an a.c. generated primary electromagnetic field. Metal screening is provided adjacent the coil so as to provide a secondary induced magnetic field which opposes the primary electromagnetic field so as to significantly reduce the metal free zone.

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patent: 4451812 (1984-05-01), Vescovi et al.
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patent: 5066937 (1991-11-01), Moran
patent: 5130697 (1992-07-01), McGinn
patent: 5293117 (1994-03-01), Hwang

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