Optical sensor

Details Optical sensor Optical sensor

1995-10-24

1996-08-13

Nguyen, Vinh P.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Using radiant energy

324117R, G01R 3306

Patent

active

055459803

ABSTRACT:
An optical sensor comprising: a light irradiation means for irradiating a linearly polarized light having a wavelength of 740 to 890 nm; a magneto-optical element having a composition of Y.sub.3-X Tb.sub.X Fe.sub.5 O.sub.12 (0.3.ltoreq..times..ltoreq.0.8) for Faraday rotating the linearly polarized light to output a rotated polarized light; and a detecting means for modulating in intensity the rotated polarized light which has been Faraday rotated by the magneto-optical element and detecting a light output of the rotated polarized light from the magneto-optical element. This magneto-optical sensor has a high sensibility and an excellent temperature characteristics under condition of low-magnetic field. When the optical sensor 10 is additionally provided with an electro-optical element having Pockels effect in parallel to the magneto-optical element, it becomes possible to measure not only current intensity but also voltage intensity.

REFERENCES:
patent: 4002975 (1977-01-01), Erickson et al.
patent: 4531092 (1985-07-01), Shibano
patent: 4899042 (1990-02-01), Falk et al.

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