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    • 2. 发明专利
    • Electric current measuring apparatus
    • 电流测量装置
    • JPS5957170A
    • 1984-04-02
    • JP16795482
    • 1982-09-27
    • Kansai Electric Power Co Inc:TheMitsubishi Electric Corp
    • HARUMOTO YASUMASAYOSHIDA YOSHIOABE YOUICHIROUIDA YOSHIAKIKONISHI NAOYUKI
    • G01R15/24
    • G01R15/245
    • PURPOSE:To obtain a small and highly sensitive electric current measuring apparatus by surrounding a conductor with a magneto-optic element having a refraction surface to turn light around the conductor. CONSTITUTION:Linearly polarized light with a polarizer 3 enters a magneto- optic element 2 surrounding a conductor 1, is reflected on mirror-like reflection surfaces 2a, 2b and 2c of a refrection means of the element 2 and emitted via a light detecting element 4 turning around through the conductor 2. Thanks to a larger optical path turning through the conductor 2, light emitted from the light detecting element 4 is modulated strongly in proportion to the magnetic field corresponding to electric current flowing through the conductor 1 while the effect of external magnetic field is eliminated due to the turning through the conductor 2 thereby preventing the effect of a conductor of other phase arranged close thereto. Thus, a small and highly sensitive electric current measuring apparatus is obtained.
    • 目的:通过用具有折射表面的磁光元件围绕导体来获得小而高灵敏度的电流测量装置,以在导体周围转动光。 构成:具有偏振器3的线偏振光进入围绕导体1的磁光元件2,被反射在元件2的反射装置的镜状反射面2a,2b和2c上,经由光检测元件4发射 通过导体2转过。由于通过导体2的较大光路,从光检测元件4发射的光与对应于流过导体1的电流的磁场成比例地强调,而外部的影响 由于通过导体2转动而消除了磁场,从而防止了靠近其的相位导体的影响。 因此,获得小而高灵敏度的电流测量装置。