| 摘要 |
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 Y3-XTbXFe5O12 (0.3</=x</=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.
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