Method and apparatus for optically measuring a current

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