Apparatus and method for penetration with shaft having a sensor for sensing penetration depth
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United States of America Patent
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Aug 24, 2010
Grant Date -
Apr 11, 2002
app pub date -
Nov 6, 2001
filing date -
Mar 30, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
An apparatus having a shaft that can sense the depth of penetration, for penetrating into an object (the substrate). The substrate being penetrated has impedance that varies according to the depth under a surface of the substrate. The shaft has a tip for penetration and has conductive ends near to the tip of the shaft. A change of impedance of material of the object between the conductive ends can be sensed to provide information on the depth of penetration. A processor can be provided external to the object being penetrated by the shaft to gather and process the impedance information to determine whether the desired depth has been achieved.
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