Title:
【発明の名称】電流センサ
Document Type and Number:
Japanese Patent JP3271117
Kind Code:
B2
Abstract:
A current sensor which makes use of the Faraday effect, which is patterned on a Sagnac interferometer and which employs a coil of spun birefringent optical fibre for sensing the magnitude of current flowing through a conductor about which the sensor is, in use, located. The sensor in its preferred form comprises a coil (10) of spun single mode birefringent optical fibre (11), the coil being arranged to locate about a conductor (12) through which current flow occurs. A beam splitting device (22) in the form of a 3*3 coupler is coupled with the ends of the coil fibre and is arranged to launch counter-propagating light beams into the respective ends of the coil fibre. A lasing light source (16) is optically coupled to the beam splitting device by way of a 2*2 coupler (21), and detectors (18) which are arranged to detect a phase shift between the polarisation modes of the counter-propagated light beams are optically coupled to the ends of the coil fibre by way of the beam splitting device.
Inventors:
Clark, Ian Grainge
Application Number:
JP51131293A
Publication Date:
April 02, 2002
Filing Date:
December 22, 1992
Export Citation:
Assignee:
The University of Sydney
International Classes:
G01D5/26; G01R15/24; G01R19/00; G01J9/02; G01R33/032; (IPC1-7): G01R15/24; G01J9/02; G01R19/00
Domestic Patent References:
| JP58172557A | ||||
| JP63317713A | ||||
| JP63263470A |
Attorney, Agent or Firm:
Akasaka Saka (1 person outside)
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