Title:
磁場勾配磁場強度複合センサ
Document Type and Number:
Japanese Patent JP4917894
Kind Code:
B2
Abstract:
A magnetic field sensor device (2) is described that comprises an oscillatory member (8) and current control means (6). The current control means (6) is arranged to pass an alternating current (AC) along at least first (10) and second (12) current paths provided through the oscillatory member (8) and is arranged to provide magnetic gradiometer mode operation (i.e. to measure magnetic field gradient) in which current flow through the first current path (10) is in substantially the opposite direction to current flow through the second current path (12). The current control means (6) can also prove magnetometer mode operation (i.e. to measure magnetic field strength). The magnetic field sensor (2) may be used in a compass.
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Inventors:
King, David Oulley
Bronson, Kevin Michael
Bronson, Kevin Michael
Application Number:
JP2006546299A
Publication Date:
April 18, 2012
Filing Date:
December 16, 2004
Export Citation:
Assignee:
Kinetic Limited
International Classes:
G01R33/02; G01C17/32; G01R33/022; G01R33/028
Domestic Patent References:
| JP2000028694A | 2000-01-28 | |||
| JP2002506212A | 2002-02-26 | |||
| JP2001506759A | 2001-05-22 | |||
| JP2001141507A | 2001-05-25 | |||
| JP2003060247A | 2003-02-28 |
Foreign References:
| WO2000068702A1 | 2000-11-16 | |||
| US3614490A | 1971-10-19 |
Attorney, Agent or Firm:
Yoshio Kawaguchi
Makoto Ono
Chihiro Watanabe
Kenkyo Kanayama
Katsuma Osaki
Mitsuaki Tsubokura
Makoto Ono
Chihiro Watanabe
Kenkyo Kanayama
Katsuma Osaki
Mitsuaki Tsubokura