Title:
SENSOR APPARATUS, IN PARTICULAR METAL SENSOR, WITH A FIELD-COMPENSATED MAGNETIC FIELD SENSOR
Document Type and Number:
WIPO Patent Application WO/2012/055641
Kind Code:
A3
Abstract:
The invention relates to a sensor apparatus (10), in particular a metal sensor, having at least two coils (12, 14) and a magnetic field sensor (16), in which the arrangement of coils and magnetic sensor with respect to one another and/or the number of coil turns and/or the winding sense of the coils and/or the coil current is/are selected in such a manner that the magnetic field generated by the coils (12, 14) approximately disappears at the location of the magnetic field sensor (16). The invention also relates to a method for detecting objects, in particular a method for finding metal objects, using at least two coils and a magnetic field sensor, in particular an AMR, GMR or Hall sensor, in which the arrangement of the coils and the magnetic sensor with respect to one another and/or the number of coil turns and/or the winding sense of the coils and/or the coil current is/are selected in such a manner that the magnetic field generated by the coils approximately disappears at the location of the magnetic field sensor.
Inventors:
KRAPF REINER (DE)
ZIBOLD TOBIAS (DE)
ALBRECHT ANDREJ (DE)
ZIBOLD TOBIAS (DE)
ALBRECHT ANDREJ (DE)
Application Number:
PCT/EP2011/066378
Publication Date:
October 18, 2012
Filing Date:
September 21, 2011
Export Citation:
Assignee:
BOSCH GMBH ROBERT (DE)
KRAPF REINER (DE)
ZIBOLD TOBIAS (DE)
ALBRECHT ANDREJ (DE)
KRAPF REINER (DE)
ZIBOLD TOBIAS (DE)
ALBRECHT ANDREJ (DE)
International Classes:
G01V3/11
Domestic Patent References:
| WO2011138150A2 | 2011-11-10 |
Foreign References:
| US5557206A | 1996-09-17 | |||
| US20080054892A1 | 2008-03-06 | |||
| US20080074109A1 | 2008-03-27 |
Attorney, Agent or Firm:
ROBERT BOSCH GMBH (Stuttgart, DE)
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