Sensor system having a magnetoelastic deformation element

US8707793B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Reinhard Nopper · Ditzingen, DE
• Denis Gugel · Dußlingen, DE
• Andreas Arlt · Weisenheim am Berg, DE
• Klaus Walter · Paderborn, DE
• Frank Schatz · Kornwestheim, DE
• Janpeter Wolff · Gerlingen, DE

Key dates

• Filing date: Nov 24, 2009
• Grant date: Apr 29, 2014
• Expiry date: Jul 4, 2032

Classification

• Technology area (CPC G): Physics
• CPC primary: G01L9/16
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A sensor system includes: an at least partially magnetoelastic deformation element for measuring pressures, caused by a fluid, that are able to be applied to the magnetoelastic deformation element; and a magnetic circuit formed via a magnetic flux feedback and having a sensor unit and an evaluation unit. The sensor unit is positioned at the deformation element and the evaluation unit having an evaluation coil is structurally separated from, yet inductively coupled to, the sensor unit. The sensor unit has a sensor coil positioned on the deformation element and the evaluation unit has the evaluation coil that is inductively coupled to the sensor coil, the sensor coil forms a resonant circuit, using its own parasitic capacitance or using an additional capacitance, which is able to be energized by the evaluation coil in free resonance with strong or weak inductive coupling by a magnetic circuit enclosing the two coils.