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A measuring device includes means for converting a physical quantity to be measured into a corresponding magnetic field. A magnetooptic element is aligned with a polarizer which passes incident light in one plane only. The part of the magnetooptic element which intercepts the transmitted magnetic fi

A measuring device includes means for converting a physical quantity to be measured into a corresponding magnetic field. A magnetooptic element is aligned with a polarizer which passes incident light in one plane only. The part of the magnetooptic element which intercepts the transmitted magnetic field rotates the throughgoing light and the position of rotation is indicated on an optical indicator.

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A device for measuring physical quantities such as length, angle, position, temperature electric current, comprising means for generating a magnetic field whose parameters are a function of a quantity under measurement; a magnetooptic element arranged for intercepting said magnetic field and for rec

A device for measuring physical quantities such as length, angle, position, temperature electric current, comprising means for generating a magnetic field whose parameters are a function of a quantity under measurement; a magnetooptic element arranged for intercepting said magnetic field and for receiving light emitted from a light source, said magnetooptic element producing a Faraday rotation of light passing therethrough; polarizing means optically coupled to said magnetooptic element to detect said Faraday rotation; indicating means for intercepting light emerging from said polarizing means to indicate a value of said quantity under measurement, said polarizing means including a polarizer arranged in the path of light rays before the magnetooptical element, and an analyzer arranged after the magnetooptical element; and said magnetooptic element being assembled of a plurality of superposed rows of a magnetooptic material extending transversely to the path of incident light, said rows forming domains which are uniformly magnetizable by the intercepted magnetic field and being separated by sharp demarkation lines ones from the other, and the polarizing means covering the overall area of the superposed domains.