Method and apparatus for optically measuring a current

Details Method and apparatus for optically measuring a current Method and apparatus for optically measuring a current

1983-03-07

1986-01-14

Corbin, John K.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

324244, 324 96, 350375, 356 72, G02F 101, H01J 4014

Patent

active

045647542

ABSTRACT:
A current is measured by making use of a rotation of polarization plane in a magnetic field, that is, a Faraday effect. A conductor under measurement is transversely inserted into a center opening of a Faraday effect glass which has at least two total reflection areas on a periphery thereof so that a light directed into the Faraday effect glass is circulated around the conductor and emitted externally. The light emitted from the Faraday effect glass is split into at least two light beams, which are converted to electric signals by photoelectric elements, and A.C. components contained in the electric signals are extracted and compared. The electric signals are corrected based on the comparison result.
The present measuring apparatus and method attain high precision current measurement in a stable manner over an extended period.

REFERENCES:
patent: 3605013 (1971-09-01), Yoshikawa
patent: 3675125 (1972-07-01), Jaeklin
patent: 3708747 (1973-01-01), Lesueur
patent: 3743929 (1973-07-01), Lesueur
patent: 3746983 (1973-07-01), Renz
patent: 3753101 (1973-08-01), Aumont
patent: 3778619 (1973-12-01), Carnel
patent: 3810013 (1984-05-01), Muller
patent: 4253061 (1981-02-01), Ono
patent: 4370612 (1983-01-01), Puech et al.
patent: 4442350 (1984-04-01), Rashleigh
"Optical Voltage and Current Measuring System for Electric Power Systems", by M. Kanoi et al., 85 SM 316-5, IEEE/PES 1985 summer meeting in Vancouver, B.C., Canada.

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