Apparatus for determining the position and velocity of a moving

Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters

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324663, 324681, 324686, G01R 2726

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active

054184681

ABSTRACT:
An apparatus for determining the position of a movable object is disclosed. A pair of fixed elements having spaced electrically conductive surfaces form a capacitor. A movable element having an electrically nonconductive composition is connected to the movable object. The movable element is disposed between the fixed element pair. In response to the movement of the movable element, the capacitance value of the variable capacitor changes. A circuit detects the change in capacitance and determines the relative position of the movable object.

REFERENCES:
patent: 4259637 (1981-03-01), Bloomfield et al.
patent: 4386312 (1983-05-01), Briefer
patent: 4794321 (1988-12-01), Dotsko
patent: 4862063 (1989-08-01), Kobayashi et al.
patent: 4864295 (1989-09-01), Rohr
patent: 4961055 (1990-10-01), Habib et al.
patent: 5040272 (1991-08-01), Fritzsche
"Handbook of Transducers for Electronic Measuring Systems", Harry N. Norton, pp. 168-169, Copyright 1969.
"Linear Displacement Measurement Circuit", Lewis D. Meixler, Jan. 1990.

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