Search head for metal detectors

Details Search head for metal detectors Search head for metal detectors

1988-12-15

1990-09-25

Woodiel, Donald O.

Communications: electrical

Condition responsive indicating system

Specific condition

324239, 324327, G08B 1314, G01V 308

Patent

active

049596365

ABSTRACT:
A search head for a metal detector, the head comprising a support body and three conductive loops mounted on the body, the loops being formed from a single ribbon cable. An oscillating signal is applied to one of the loops and induced voltages in the other two loops are subtracted, the arrangement being such that a difference will appear in the subtracted voltages when a metal object is closer to the other two loops.

REFERENCES:
patent: 3950696 (1976-04-01), Miller et al.
patent: 4024468 (1977-05-01), Hirschi
patent: 4091322 (1978-05-01), Stankoff
patent: 4263553 (1981-04-01), Cook et al.
patent: 4659989 (1987-04-01), Kerr
patent: 4795995 (1989-01-01), Eccleston et al.

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