Device and method of detecting ferrite and non-ferrite objects

Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material

Reexamination Certificate

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C324S326000

Reexamination Certificate

active

07977938

ABSTRACT:
A metal detector for detecting the presence of a ferrite object in the proximity of inductively coupled sensor having overlapping D shaped transmitter and receiver coils. The metal detector has a phase shift circuit to phase shifting a sensor output signal by a known amount and a switch operating in synchronization with an excitation signal of the sensor for sampling the amplitude of the phase shifted output signal.

REFERENCES:
patent: 4249128 (1981-02-01), Karbowski
patent: 4507612 (1985-03-01), Payne
patent: 4700139 (1987-10-01), Podhrasky
patent: 4709213 (1987-11-01), Podhrasky
patent: 5506506 (1996-04-01), Candy
patent: 5729143 (1998-03-01), Tavernetti et al.
patent: 2008/0084212 (2008-04-01), Wieland
patent: 32 28 447 (1984-02-01), None

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