Device and method of detecting ferrite and non-ferrite objects

Details Device and method of detecting ferrite and non-ferrite objects Device and method of detecting ferrite and non-ferrite objects

2011-07-12

2011-07-12

LeDynh, Bot L (Department: 2858)

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

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.

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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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