Magnetic sensor system

US7548060B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Ingo Herrmann · Friolzheim, DE
• Paul Farber · Stuttgart, DE
• Ulrich May · Rutesheim, DE
• Christian Bauer · Neu-Ulm, DE
• Birgit Vogelgesang · Bietigheim-Bissingen, DE

Key dates

• Filing date: Jan 7, 2005
• Grant date: Jun 16, 2009
• Expiry date: Oct 25, 2025

Classification

• Technology area (CPC G): Physics
• CPC primary: G01P3/487
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A magnetic sensor system (1) is provided that contains sensor elements (5, 6) that are sensitive to magnetic fields, the electrical properties of said sensor elements being modifiable according to a magnetic field that can be influenced by a mobile, passive transmitter element (8). The magnetic sensor system (1) includes two sensor elements (5, 6) in a gradiometer system, each of which is assigned to one of two permanent magnets (2, 3) having a predetermined separation. In terms of their dimensions, separation and position relative to the sensor elements (5, 6), the permanent magnets (2, 3) are located such that the offset of the output signal of the sensor elements (5, 6) is minimized in the gradiometer system.