Laser For Measurement of Current and Voltage
If polarized light is passed along a magnetic field of strength H, the plane of polarization is rotated by an amount given by,
A system for current/voltage measurement using the faraday effect. Light from the laser source is passed through a polarizing filter and then through a high verdet constant glass rod in the magnetic field of current and voltage to be measured. The transm to the first screen and then to the detector. With no current flowing, a steady signal will be received at the detector. In the presence of current , the plane of polarization will be rotataed clockwise or anticlockwise depending on the direction of the current while the angle of rotation will be a function of the current & voltage magnitude.