Patent · US Active

Detection of a metal or magnetic object

US9110122B2 · kind B2 · utility

0Cited by

3References

10Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

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

Key dates

Filing date	Apr 15, 2011
Grant date	Aug 18, 2015
Priority date	—
Expiry date	Mar 15, 2032

Classification

Technology area (CPC G)Physics
CPC primaryG01V3/107
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A measuring device for detecting a metal object includes two emission coils configured to produce superimposed magnetic fields, a receiving coil in the region of both magnetic fields, and a control device configured to control the emission coils such that a value of a voltage, which is clock synchronized with alternating voltages and which is induced in the emission coils, is minimized. The control device is configured to detect the metal object when a ratio of the alternating voltages does not correspond to a ratio of distances between the receiving coils and the emission coils.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.