Determining gaps between a proximity probe and a conductive target material
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Abstract
A digital eddy current proximity system including a digital impedance measuring device for digitally measuring the proximity probes impedance correlative to displacement motion and position of a metallic target object being monitored. The system further including a cable-length calibration method, an automatic material identification and calibration method, a material insensitive method, an inductive ratio method and advanced sensing characteristics.
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Citations
142 Claims
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1-21. -21. (canceled)
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22-43. -43. (canceled)
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44-94. -94. (canceled)
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95.
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96-138. -138. (canceled)
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139. An apparatus for determining gaps between a proximity probe and a conductive target material, said apparatus comprising in combination:
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a network including a first electrical component and said proximity probe serially connected;
a signal generating means operatively coupled to said network for driving a current through said serial connection for establishing a first analog voltage signal across said network and a second analog voltage signal across said proximity probe;
sampling means for digitizing said established voltage signals into digital voltage signals;
a digital multiplier for multiplying each of said digital voltage signals by a digital sine signal and a digital cosine signal;
means for accumulating values of each multiply in a memory, and means for processing each multiply for obtaining complex voltage representations correlative to gaps between said proximity probe and the conductive target material. - View Dependent Claims (140, 141, 142)
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Specification