Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Using radiant energy
Patent
1992-12-18
1995-09-19
Nguyen, Vinh P.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Using radiant energy
324117R, G01R 3306
Patent
active
054518644
ABSTRACT:
An optical sensor includes: a light irradiation source for irradiating 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 detector 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 excellent temperature characteristics under a condition of low-magnetic field. When the optical sensor 10 is additionally provided with an electro-optical element having a 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: 5212446 (1993-05-01), Itoh et al.
IEEE Journal Quantum Electronics, vol. QE-18, No. 10, Oct. 1982; Fiber Optic Measuring System for Electric Current by Using A Magnetooptic Sensor Kakuo Kyuma, et al. pp. 1619-1623.
"Magnetic Garnet Faraday Element For Optical Cutrrent Sensors"; Technical Digest of the 11th Sensor Symposium; 1992; pp. 87-90.
Kabushiki Kaisha Toshiba
Nguyen Vinh P.
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