Electricity: measuring and testing – Magnetic – Displacement
Reexamination Certificate
2006-10-31
2006-10-31
Patidar, Jay M. (Department: 2862)
Electricity: measuring and testing
Magnetic
Displacement
C324S207160
Reexamination Certificate
active
07129701
ABSTRACT:
A method of non-intrusive, inductive proximity sensing of a target through a conductive barrier comprises the steps of: disposing an inductive proximity sensor on one side of a barrier of conductive material; disposing a target on the other side of the barrier; determining an appropriate drive frequency for operating the proximity sensor based on the conductive material and thickness of the barrier; and operating the proximity sensor with the appropriate drive frequency to non-intrusively sense the proximity of the target through the conductive barrier. The method may include the steps of: varying the gap between the target and proximity sensor over a gap range; measuring the inductive output of the proximity sensor at the appropriate drive frequency and different gaps to obtain inductive output measurements at the different gaps; determining the operating induction bandwidth of the proximity sensor operated at approximately the appropriate drive frequency from the inductive output measurements at the different gaps; and using the determined induction bandwidth for proximity sensing of the target through the conductive barrier. The gap range may be based on a sensor/target gap variation during actuation for a particular application.
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Calfee Halter & Griswold
Hernandez, Esq. Peter M.
Patidar Jay M.
Simmonds Precision Products Inc.
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