Absolute position encoder

US7091883B2 · kind B2 · utility

Assignee

• CAMERON INTERNATIONAL CORPORATION · US

Inventors

• Peter Kunow · Berlin, DE
• Klaus Biester · Celle, DE

Key dates

• Filing date: Feb 28, 2003
• Grant date: Aug 15, 2006
• Expiry date: Feb 28, 2023

Classification

• Technology area (CPC G): Physics
• CPC primary: G01D5/34776
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A transducer, a method and a coding pattern for determining a kinematic measurable variable are disclosed. A transducer comprises a first device part which is moveable in or through a corresponding device for oil or natural gas production and a second device part which is stationary relative to said first device part. To detect both the directions of movement and the respective position in a simple constructional and inexpensive way without the need for return movement up to ends of the range of movement, the first and/or second device part comprises a coding pattern which is changing along a direction of movement and of which position-specific patterns can be scanned by a scanning means which is arranged on the respective other device part. By scanning such a specific coding pattern during mutual relative movement of said objects or device parts a corresponding scanning signal can then be converted by an evaluation unit into a kinematic measurable variable. The corresponding coding pattern comprises a plurality of single patterns wherein neighboring single patterns differ from one another by at least one characteristic feature and/or said single pattern has at least one characteri…