Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1982-12-02
1986-08-26
Karlsen, Ernest F.
Electricity: measuring and testing
Magnetic
Magnetometers
324 96, 350374, G01R 3302, G01R 3100, G02B 530
Patent
active
046085351
ABSTRACT:
A magnetic field and electric current measuring device which uses bismuth silicon oxide (Bi.sub.12 SiO.sub.20) or bismuth germanium oxide (Bi.sub.12 GeO.sub.20) as a Faraday cell, and which is so adapted that polarized light which enters the cell is passed back and forth through the cell along the optic axis thereof to cancel any change in optical rotatory power ascribable to a variation in temperature. A magnetic field applied in the direction of the optic axis of the Faraday cell is measured based on the angle of rotation of the polarization plane of the polarized light. The surface of the Faraday cell may be coated with a transparent and electrically conductive thin film to eliminate the effects of external electric fields.
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Optical Engineering/Jan./Feb. 1981/vol. 20, No. 1, "High-Voltage Current Transformers with Optical Signal Transmission".
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Feldman et al., "Optical Activity and Faraday Rotation in Bismuth Oxide Compounds", Applied Physics Letters, vol. 16, No. 5, Mar. 1, 1970, pp. 201-202.
Kuhara Yoshiki
Mitsui Tsutomu
Tada Kohji
Tatsumi Masami
Karlsen Ernest F.
Snow Walter E.
Sumitomo Electric Industries Ltd.
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