【発明の名称】電流の強さを測定するための光ファイバ装置

Title:

【発明の名称】電流の強さを測定するための光ファイバ装置

Document Type and Number:

Japanese Patent JPH05500709

Kind Code:

A

Abstract:

PCT No. PCT/DE90/00530 Sec. 371 Date Feb. 5, 1992 Sec. 102(e) Date Feb. 5, 1992 PCT Filed Jul. 12, 1990 PCT Pub. No. WO91/01500 PCT Pub. Date Feb. 7, 1991.In the case of a fiber optics arrangement for measuring the intensity of an electric current while utilizing the Faraday effect in which the magnetic field surrounding the conductor 1 through which the current flows affects the polarization condition of the light, the path of which leads through the core of an optical fiber 2 which surrounds the conductor 1 in the form of a coil, the light coupled out of the optical fiber 2, by means of a beam splitter 9, being divided into two partial light beams, the intensities (I1, I2), after passage through one polarizer 12, 11 respectively, being measured by one photodetector 14, 13 respectively, the object of expanding the measuring range of the arrangement is achieved by the fact that the polarizers 12, 11 are rotated symmetrically with respect to one another in comparison to the conventional angle of 45 degrees, the angle ( alpha ) between the polarizers 12, 11 and the polarization plane of the light coupled into the optical fiber 2 being between +20 degrees and 40 degrees or between -20 degrees and -40 degrees. (FIG.

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