Magneto-optical element and optical magnetic field sensor

Details Magneto-optical element and optical magnetic field sensor Magneto-optical element and optical magnetic field sensor

1994-03-18

1996-01-16

Wieder, Kenneth A.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Using radiant energy

3242441, 324244, 324117R, G01R 3100

Patent

active

054850797

ABSTRACT:
A magneto-optical element is of a rare-earth iron garnet crystal expressed at least by formula 1, and a element in whose composition range the value of X is set at 0.8.ltoreq.X.ltoreq.1.3; that of Y at 0.2.ltoreq.Y.ltoreq.0.4; that of Z at 0.1.ltoreq.Z.ltoreq.0.9; and that of W at 0.ltoreq.W.ltoreq.0.3; and R element is made at least one or more kinds of rare-earth elements. An optical magnetic field sensor is composed in such a manner that light diffracted by magnetic domain structure of rare-earth iron garnet crystal can be detected up to a higher-order light by optical fiber on light output side through optical system arrangement. A magnetic field measuring equipment composed of the optical magnetic field sensor has a linearity error of .+-.1.0% or less within a magnetic field range 5.0 Oe to 200 Oe, and allows a measuring accuracy higher than with prior art equipment.

REFERENCES:
patent: H371 (1987-11-01), Bobb
patent: 4823083 (1989-04-01), Meunier et al.

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