Measuring device for capacitive determination of the relative po

Communications: electrical – Continuously variable indicating – With particular transmitter

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324 61R, G08C 1910

Patent

active

044207549

ABSTRACT:
A system for measuring the relative movement between two elements, such as the scale and slide of a hand-held measuring instrument includes the provision of a number of groups of supply electrodes on the slide, each of the electrodes in each group being supplied from a respective one of a multiple number of output signals from a signal generator so that all of the supply electrodes are furnished with voltages according to a cyclic pattern, the slide also having at least one receiving electrode which feeds a signal processing unit. The scale is provided with an electronic pattern comprising internally galvanically connected parts, one being a detecting part, located close to the area where the supply electrodes of the slide are moved, the other of the two parts being a transferring part which is located close to the area where the receiving electrode of the slide is moved. The movement of the slide along the scale generates a signal from the receiving electrode which is derived from the signals from at least two adjacent supply electrodes and the position of the slide is determined by a signal processing unit which identifies the amplitude ratio of the received signals.

REFERENCES:
patent: 3125716 (1964-03-01), Machlis
patent: 3198937 (1965-08-01), Wooster
patent: 3702467 (1972-11-01), Melnyk
patent: 3938113 (1976-02-01), Dobson et al.
patent: 3961318 (1976-06-01), Farrand et al.
patent: 4092579 (1978-05-01), Weit
patent: 4182981 (1980-01-01), Shum et al.
The flyer "Das SYLVAC-Mess-System".
A sworn declaration and corrobrative test with list and brochure of the Trimos Co.
The test from the Commissariat a l'Energie Atomique, "Captuers Capacitifs de Deplacements Lineaires et Angulaires".

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