Capacitive locating appliance having opposing electrodes

US9470646B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Tobias Zibold · Stuttgart, DE
• Andrej Albrecht · Stuttgart, DE

Key dates

• Filing date: Feb 14, 2013
• Grant date: Oct 18, 2016
• Expiry date: Mar 17, 2033

Classification

• Technology area (CPC G): Physics
• CPC primary: G01V3/088
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A locating appliance for a capacitive detection of an object encloses in a medium. The locating appliance comprises a measurement electrode such that a first alternating current flows from the measurement electrode into the medium. The locating appliance further comprises a reception electrode where the measurement electrode forms a measurement capacitance with the reception electrode, where the measurement capacitance is based at least in part on the object. The locating appliance further comprises a reference electrode such that the reference electrode forms a reference capacitance with the reception electrode, where the reference capacitance is not based on the object. The locating appliance further comprises a first opposing electrode that is configured to introduce a first alternating current in the medium. The absolute value of the second alternating current corresponds to an absolute value of the first alternating current and is in antiphase with the second alternating current.