Device and method of detecting ferrite and non-ferrite objects
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United States of America Patent
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Jul 12, 2011
Grant Date -
Nov 6, 2008
app pub date -
Aug 23, 2007
filing date -
May 4, 2007
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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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