METAL DETECTOR WITH IMPROVED MAGNETIC RESPONSE APPLICATION
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United States of America Patent
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Issued Date -
Nov 11, 2010
app pub date -
Nov 11, 2008
filing date -
Nov 12, 2007
priority date (Note) -
Abandoned
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Abstract
This invention discloses a low cost metal detector which suppresses signals arising from signals induced in a receive inductor from a rate of change of environmental static fields. The metal detector processes a signal due to a rate of change of environmental static fields to produce a first signal, and processes a signal due to the transmitted magnetic field to produce a second signal, the second signal includes a proportion of the first signal. Signal processing includes the subtraction of an estimation of the proportion of the first signal from the second signal to produce a third signal, such that the third signal is substantially independent of the first signal; and the receive electronics further processes the third signal to produce an indicator output signal, the indicator output signal includes a signal indicative of the presence of a metallic target and is substantially unaffected by the signal due to a rate of change of environmental static fields.
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