Global patent index - EP 1055127 A1

EP 1055127 A1 2000-11-29 - METHOD AND DEVICE FOR MEASURING A MAGNETIC FIELD WITH THE AID OF THE FARADAY EFFECT

Title (en)

METHOD AND DEVICE FOR MEASURING A MAGNETIC FIELD WITH THE AID OF THE FARADAY EFFECT

Title (de)

VERFAHREN UND EINRICHTUNG ZUM MESSEN EINES MAGNETFELDES MIT HILFE DES FARADAY-EFFEKTES

Title (fr)

PROCEDE ET DISPOSITIF POUR MESURER UN CHAMP MAGNETIQUE PAR EFFET FARADAY

Publication

EP 1055127 A1 (DE)

Application

EP 99914415 A

Priority

  • DE 9900390 W
  • DE 19805813 A
  • DE 19851551 A

Abstract (en)

[origin: US6495999B1] A magnetic field is measured with the aid of the Faraday effect. Light is coupled into a Faraday element subjected to the magnetic field, the light having a linearly polarized first component at a first wavelength and an unpolarized second component at a second wavelength different from the first. A light signal is coupled out of the Faraday element and is split optically into a first light signal component with the first wavelength and a second light signal component with the second wavelength. A first measurement signal is derived from the first light signal component and a second measurement signal is derived from the second light signal component and these are used to form a corrected measurement signal S. In this way, attenuation influences in the transmission paths can be largely compensated for, even when measuring a magnetic field which is constant over time or a magnetic field with a component which is constant over time.

IPC 1-7 (main, further and additional classification)

G01R 15/24

IPC 8 full level (invention and additional information)

G01R 15/24 (2006.01)

CPC (invention and additional information)

G01R 15/246 (2013.01); G01R 15/247 (2013.01)

Citation (search report)

See references of WO 9941617A1

Designated contracting state (EPC)

CH DE FR GB LI NL SE

EPO simple patent family

US 6495999 B1 20021217; CA 2320037 A1 19990819; CN 1290350 A 20010404; EP 1055127 A1 20001129; NO 20004064 A 20001010; NO 20004064 D0 20000811; WO 9941617 A1 19990819

INPADOC legal status

2005-03-09 [18D] DEEMED TO BE WITHDRAWN

- Ref Legal Event Code: 18D

- Effective date: 20040831

2001-08-01 [17Q] FIRST EXAMINATION REPORT

- Ref Legal Event Code: 17Q

- Effective date: 20010618

2000-11-29 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20000901

2000-11-29 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): CH DE FR GB LI NL SE