Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1984-10-26
1988-05-10
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
324 61P, 34087037, G01R 2726, G08C 1910
Patent
active
047438380
ABSTRACT:
In a capacitance type displacement measuring instrument, wherein a change in electric capacitance between electrodes due to a relative displacement between two members movable relative to each other is detected on the basis of a change in phase of a detection signal, and a relative displacement between the two members is measured from the change in phase, square waveform signals are applied in inversed phase to two transmitting electrodes provided on one of the members and signals induced on two wave pattern electrodes provided on the other of the members are received by receiving electrodes provided on the first of the members. Outputs from the receiving electrodes are successively taken in by a multiplexer, and then the amplitude-modulated square wave signals, outputted from the multiplexer, are demodulated. A phase detector measures the phase of the demodulated waveform, thereby measuring the relative displacement on the basis of change in phase.
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Eisenzopf Reinhard J.
Harvey Jack B.
Mitutoyo Mfg. Co. Ltd.
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