OPTICAL AC VOLTAGE METER IN HIGH-VOLTAGE NETWORKS Russian patent published in 2017 - IPC G01R15/24 G01R19/00 

FIELD: measuring equipment.

SUBSTANCE: meter comprises a light source and a multimode optical fiber, a first polarizer, an active element of the Faraday cell, a second polarizer, which transmission plane makes the angle of ±45° with the polarization plane of the first one, a converging lens, a second multimode optical fiber and a photodetector, as well as a linear amplifier of the photodetector signal, a signal conversion unit, and an indicator of measurement results, installed in series. The active element of the Faraday cell is made in the form of a quadrangular prism of the height h, one pair of side faces of which has a width not less than the diameter D of the collimated light beam, and the opposite side faces have a width of at least 3D, the first prism base on which the light falls is polished, and Its surface in the center is coated with mirror coating in the form of a rectangular strip of the width D, the other base of the prism is divided into three equal rectangular zones, on both sides of the central rectangular zone it contains two polished surfaces with mirror coatings, making angles γ=arctg (0.5D/h) with the central zone plane.

EFFECT: reducting the distortions of the light polarization state, increasing the sensitivity and accuracy of measurements.

4 cl, 5 dwg