Method for measuring a gap between a proximity probe and a conductive target material
First Claim
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1. A method for measuring a gap between a proximity probe and a conductive target material, the steps including:
- sampling and digitizing a first voltage impressed across a serial connection of a first electrical component, an extension cable and a proximity probe located adjacent a conductive target material to obtain a first digitized voltage;
sampling and digitizing a second voltage impressed across the probe to obtain a second digitized voltage, transforming the two digitized voltages into complex voltage numbers;
determining an electrical impedance of the proximity probe by using both complex voltage numbers and compensating for the extension cable;
normalizing the electrical impedance of the proximity probe;
correlating the normalized electrical impedance of the proximity probe to a gap between the proximity probe and the 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 calibrations method, an automatic material identification and calibration method, a material insensitive method, an inductive ratio method and advanced sensing characteristics.
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3 Claims
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1. A method for measuring a gap between a proximity probe and a conductive target material, the steps including:
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sampling and digitizing a first voltage impressed across a serial connection of a first electrical component, an extension cable and a proximity probe located adjacent a conductive target material to obtain a first digitized voltage;
sampling and digitizing a second voltage impressed across the probe to obtain a second digitized voltage, transforming the two digitized voltages into complex voltage numbers;
determining an electrical impedance of the proximity probe by using both complex voltage numbers and compensating for the extension cable;
normalizing the electrical impedance of the proximity probe;
correlating the normalized electrical impedance of the proximity probe to a gap between the proximity probe and the conductive target material. - View Dependent Claims (2, 3)
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Specification