Title:
PHOTOMETRIC TYPE CURRENT/MAGNETIC FIELD MEASURING APPARATUS AND PHOTOMETRIC TYPE ELECTRIC FIELD MEASURING APPARATUS
Document Type and Number:
Japanese Patent JPH07244085
Kind Code:
A
Abstract:
PURPOSE: To enable a magnetic field (electric field) to be highly accurately measured by reducing adverse effect of a high frequency noise.
CONSTITUTION: As the light source 20, a light source emitting naturally released light subjected to an induction gain. To be more specific, the light source 20 herein used is so arranged to emit light with a coherence length in a range of 10μm-100μm and with a spreading angle in a range of 15°-50°. A polarization maintaining fiber is used as optical fiber 30 for transmission to couple the light source 20 and a sensor section 40 optically. A multi-mode fiber is used as photoguide fibers 51 and 52 to guide modulation light emitted from the sensor section 40 to a measuring section 60.
Inventors:
KUROSAWA KIYOSHI
YOSHIDA SATORU
MASUDA ISAO
SAKAMOTO KAZUO
YAMASHITA TOSHIHARU
YOSHIDA SATORU
MASUDA ISAO
SAKAMOTO KAZUO
YAMASHITA TOSHIHARU
Application Number:
JP3688294A
Publication Date:
September 19, 1995
Filing Date:
March 08, 1994
Export Citation:
Assignee:
HOYA CORP
TOKYO ELECTRIC POWER CO
TOKYO ELECTRIC POWER CO
International Classes:
G01R33/032; G01R15/22; G01R29/12; (IPC1-7): G01R15/22; G01R29/12; G01R33/032
Attorney, Agent or Firm:
Yosuke Goto (2 outside)
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