Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2006-12-05
2006-12-05
Wu, Daniel (Department: 2612)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S551000, C340S572800, C324S345000, C324S347000
Reexamination Certificate
active
07145456
ABSTRACT:
A metal detection circuit that includes a power source and a connection to ground. At least one transmitter circuit is electrically coupled to the power source and ground and a transmit coil is electrically coiled to the transmitter circuit. At least one receiver coil has provided along with an amplifier to be electrically coupled to the receiver coil. An integrator is electrically coupled to the amplifier and a track/hold circuit is electrically to the integrator. A filter is electrically coupled to the track/hold circuit and an output. The circuit provides a high amplitude, low duty cycle excitation pulse, which allows for the sensitivity of a high level excitation signal with the power economy of a much lower energy excitation signal. The receiver circuit collects and conditions the signals resulting from the relatively short duration, large amplitude excitation pulse, and goes in to hold mode during the relatively long charge and idle periods.
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patent: 5841346 (1998-11-01), Park
patent: 6696947 (2004-02-01), Bybee
Fisher Research Labs, Inc.
Hunnings Travis
Schwabe Williamson & Wyatt P.C.
Wu Daniel
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