Capacitive device for measuring dimension

Details Capacitive device for measuring dimension Capacitive device for measuring dimension

1997-10-10

2000-06-06

Ballato, Josie

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324662, G01R 2726

Patent

active

060723181

ABSTRACT:
Double-emitting and multiple-receiving capacitive measuring device: it comprises a scale equipped with an array of electrodes and a transducer, which moves parallel to and opposite the scale and is equipped with two emitting electrodes and an array of receiving electrodes distributed into N groups. The capacitive coupling between the different electrodes allows the position of the transducer to be determined. A generator emits two emission signals (E0, E1) in phase opposition on the two emitting electrodes of the transducer. The frequency of generated emission signals (E0, E1) depends upon the speed of displacement of the transducer. Processing means determine a dimension with the aid of N signals (R0, R7) received on the receiving electrodes. The more significant bits of the result are provided by a primary counting system using a first algorithm. The less significant bits are provided by a secondary precision system using a second algorithm.

REFERENCES:
patent: 4437055 (1984-03-01), Meyer
patent: 4449179 (1984-05-01), Meyer
patent: 4743838 (1988-05-01), Eckerle
patent: 4743902 (1988-05-01), Andermo
patent: 4878013 (1989-10-01), Andermo
patent: 5225830 (1993-07-01), Andermo
patent: 5394096 (1995-02-01), Meyer

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