Capacitance type displacement measuring instrument

Details Capacitance type displacement measuring instrument Capacitance type displacement measuring instrument

1984-10-26

1988-03-22

Caldwell, Sr., John W.

Communications: electrical

Continuously variable indicating

With particular transmitter

34087025, 324 61P, G08C 1910

Patent

active

047332352

ABSTRACT:
A capacitance type displacement measuring instrument is disclosed in which a change in electric capacity between electrodes due to a change in 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 displacement value between the two members is measured from the change in the capacity. AC signals are successively applied to transmitting electrodes provided on one of the members at a predetermined pitch by a multiplexer and signals induced in transfer electrodes at a predetermined pitch differing from the aforesaid pitch of the transmitting electrodes are received by pickup electrodes provided on the aforesaid one of the members. The relative displacement is detected from a change in phase of a received signal of substantially triangular waveform, which are obtained by the pickup electrode.

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patent: 4429307 (1984-01-01), Fortescue
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patent: 4459702 (1984-07-01), Medwin
patent: 4654581 (1987-03-01), Neukermans et al.

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