Impulse induced eddy current type detector using plural measurin

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

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Details

324239, 324336, 340551, G01V 311, G01R 3300

Patent

active

048946192

ABSTRACT:
The invention relates to a method and an apparatus for detecting metal objects in a metal detecting apparatus using impulse techniques. The metal detector comprises a compensation circuit arranged in between the transmitter system (13) and the receiver system (14) in order to compensate the mutual inductance between the transmitter (11) and the receiver (12). The compensation circuit is advantageously operated so that the signal caused by the metal object in this detector is measurable during both at least two measuring sequences (21,22) located within the range of the cut-off peak of the transmitter current and during at least one measuring sequence (23) located outside the range of the cut-off peak of the transmitter current.

REFERENCES:
patent: 2735980 (1956-02-01), Wait
patent: 3105934 (1963-10-01), Barringer
patent: 3210652 (1965-10-01), Seigel
patent: 3395338 (1968-07-01), Barringer
patent: 3707672 (1972-12-01), Miller et al.
patent: 4110679 (1978-08-01), Payne
patent: 4114086 (1978-09-01), Kaufman
patent: 4600356 (1986-07-01), Bridges et al.

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