Method for digitally measuring electrical impedance
First Claim
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1. A method for digitally measuring electrical impedance, the steps including:
- forming a network including providing a first electrical component and a second electrical component serially connected;
driving the network with a dynamic signal for impressing a voltage across the network and each component;
digitizing the voltage across the network and the voltage across the second electrical component;
convolving each of the digitized voltages with a digital waveform for forming a first complex number and a second complex number correlative to the voltages across the network and across the second electrical component respectively;
determining a ratio of the second complex number to a difference between the first complex number and the second complex number;
calculating an electrical impedance of the second electrical component by multiplying the ratio by a know digitized value of the first electrical component wherein said electrical impedance of the second component is digitally measured.
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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
10 Claims
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1. A method for digitally measuring electrical impedance, the steps including:
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forming a network including providing a first electrical component and a second electrical component serially connected;
driving the network with a dynamic signal for impressing a voltage across the network and each component;
digitizing the voltage across the network and the voltage across the second electrical component;
convolving each of the digitized voltages with a digital waveform for forming a first complex number and a second complex number correlative to the voltages across the network and across the second electrical component respectively;
determining a ratio of the second complex number to a difference between the first complex number and the second complex number;
calculating an electrical impedance of the second electrical component by multiplying the ratio by a know digitized value of the first electrical component wherein said electrical impedance of the second component is digitally measured. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification