Capacitive displacement measuring device with T-shaped scale coatings

US5068653A · kind A · utility

Assignee

• Mauser-Werke Oberndorf GmbH · DE

Inventors

• Otto Klingler · Obermoschel, DE
• Siegfried Gruhler · Vöhringen, DE
• Helmut Rivinius · Roigheim, DE

Key dates

• Filing date: Nov 9, 1984
• Grant date: Nov 26, 1991
• Expiry date: Nov 9, 2004

Classification

• Technology area (CPC G): Physics
• CPC primary: G01D5/2415
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A capacitance length and/or angle measuring device has a transducer comprising a stationary part (1) forming a scale and a part (2) displaceable parallel over the surface of the scale, at a short distance therefrom and acting as a sensing unit. The opposite surfaces of the scale and sensing unit are provided with capacitor coatings (5,6,7,8,9). The mechanical quantity to be measured causes an area vibration of a capacitor, the capacitance variation resulting therefrom acting as a variable capacitive reactance in a circuit, which changes the phase position of the electrical signals. With an appropriate configuration of the capacitor surfaces one obtains a linear function between the mechanical quantity to be measured and the phase portion of the signals.