Dual field search coil for pulse induction metal detectors

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location

Reexamination Certificate

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Details

C324S228000

Reexamination Certificate

active

07994789

ABSTRACT:
A new dual field search coil for pulse induction metal detectors has multiple coplanar wire coils of different diameters connected in series with the output of a pulse source, overcoming the loss of target size resolution associated with a single coil search loop. Small objects are sensed by an internal small coil and larger objects are sensed by the larger outside coil, and the overall depth of target sensing remains similar to that of a single coil construction. The smaller coil is isolated from the pulse source by the inductance of the larger coil and will ring at a frequency determined by its own parameters. To prevent the smaller coil from ringing, a second damping resistor is connected across the terminals of the smaller coil at the junction of the large and small coils making up the modified search loop.

REFERENCES:
patent: 3721859 (1973-03-01), Blanyer
patent: 4942360 (1990-07-01), Candy
patent: 5576624 (1996-11-01), Candy
patent: 6104193 (2000-08-01), Bell
patent: 6362739 (2002-03-01), Burton
patent: 6690169 (2004-02-01), Candy
patent: 6927577 (2005-08-01), Nelson
patent: 7075304 (2006-07-01), Nelson
patent: 7148691 (2006-12-01), Nelson et al.
patent: 7157913 (2007-01-01), Nelson
patent: 7176691 (2007-02-01), Nelson

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