Constant Current Metal Detector with Driven Transmit Coil
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United States of America Patent
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app pub date -
Mar 26, 2014
filing date -
Jun 29, 2009
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Abandoned
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Abstract
A metal detector transmitting, through a transmit coil, a repeating transmit signal cycle, which includes at least one receive period and at least one non-zero transmit coil reactive voltage period; and sensing a current in the transmit coil during at least one receive period to control a magnitude and/or duration of the at least one non-zero transmit coil reactive voltage period such that the average value of the current during at least one receive period of every repeating transmit signal cycle is substantially constant from cycle to cycle, and the current during at least one receive period is substantially independent of the inductance of the transmit coil.
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