Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1996-04-17
1998-03-24
Brown, Glenn W.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
324662, G01R 2726
Patent
active
057317070
ABSTRACT:
A method and apparatus for synthesizing spatial waveforms in electronic position encoders allows the position of a composite spatial waveform applied to an electronic position transducer to be incremented by amounts less than the pitch of the electrodes of the electronic position transducer. The position of the composite spatial waveform is adjusted by applying several individual spatial waveforms to the electronic position transducer during a position measurement. The position of one or more individual spatial waveforms is altered by increments of the electrode pitch. As a result, a position of the composite spatial waveform resulting from the individual spatial waveforms is the average position of the individual spatial waveforms. In one embodiment, the composite spatial waveform is applied to the transmitter electrodes of an electronic position transducer. The position of the composite spatial waveform is adjusted so that the voltage from the electronic position transducer is minimized. In another embodiment, a plurality of pulses are applied to a single electrode of an electronic position transducer during a measurement. Each pulse generates a spatial waveform on a plurality of electrodes. The signals on the electrodes are summed after passing through a demodulating phase shifter. At least one of the spatial waveforms is shifted by a distance corresponding to the pitch of the electrodes, resulting in an average shift that is less than the pitch of the electrodes. The position of the composite spatial waveform is adjusted to minimize the sum of the voltages forming the composite waveform.
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Brown Glenn W.
Mitutoyo Corporation
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