Title:
CURRENT MEASURING APPARATUS
Document Type and Number:
Japanese Patent JP3219951
Kind Code:
B2
Abstract:
PURPOSE: To provide a current measuring apparatus which can perform highly accurate measurement by eliminating an error due to influence of an external magnetic field or non-uniformity in current in a conductor to be measured.
CONSTITUTION: The current measuring apparatus has an optic fiber sensor 2 located to be wound around an outer periphery of a conductor 1 where current I to be measured is flowing. The optical fiber sensor 2 allows linearly polarized light to pass by surrounding the outer periphery of the conductor 1, while its light path is a non-closed loop. An incident optic part 3 is closely located on an incident end 2a side of the sensor 2, while an emitting optic part 5 is closely located on the emitting end 2b side of the sensor 2. A box 7 formed out of a member having high magnetic permeability or a conductive member is placed to enclose an outer periphery of the incident end 2a of the linearly polarized light to the sensor 2 and the emitting end 2b of the linearly polarized light from the sensor 2.
Inventors:
Kiyoshi Kurosawa
Satoshi Yoshida
Reiji Kondo
Kazuo Sakamoto
Satoshi Yoshida
Reiji Kondo
Kazuo Sakamoto
Application Number:
JP31852894A
Publication Date:
October 15, 2001
Filing Date:
December 21, 1994
Export Citation:
Assignee:
THE TOKYO ELECTRIC POWER COMPANY,INCORPORATED
Hoya Co., Ltd.
Hoya Co., Ltd.
International Classes:
G01R15/24; G02F1/095; (IPC1-7): G01R15/24; G02F1/095
Domestic Patent References:
| JP6453169A | ||||
| JP5232145A |
Attorney, Agent or Firm:
Masatoshi Matsumoto