Metal detector with improved receiver coil

Details Metal detector with improved receiver coil Metal detector with improved receiver coil

2006-01-23

2010-02-02

LeDynh, Bot L (Department: 2858)

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

C324S228000

Reexamination Certificate

active

07656153

ABSTRACT:
A pulse-induction-type metal detector in which the receiver coil comprises bifilar windings that are connected in series, opposing during the coil pulse and in series, aiding, following the coil pulse. Pick-up of energy by the receiver coil during the coil pulse is thereby minimized and the duration of oscillations is curtailed. Owing to the rapid recovery of the system from the flux change that is used to charge the target, the signal sampling gate can be positioned very close to the trailing edge of the coil-current pulse, whereby detection of targets with very short time constants is made possible.

REFERENCES:
patent: 3471773 (1969-10-01), Penland
patent: 4255711 (1981-03-01), Thompson
patent: 4659896 (1987-04-01), Krasicki
patent: 4665369 (1987-05-01), Faller et al.
patent: 4866424 (1989-09-01), Parks
patent: 4943770 (1990-07-01), Ashley-Rollman et al.
patent: 5227719 (1993-07-01), Peterson et al.
patent: WO 8701203 (1987-02-01), None

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