Ring Interferometric Voltage Sensor Using LiNbO3 Crystal

Abstract

In this work, optical voltage sensors based on ring interferometry are studied to enable the measurement of the DC voltage by introducing a phase modulation technique. From experiments using z-cut LiNbO3 crystals as linear electrooptic elements for the sensing element and the phase modulator, a high sensitivity of 1.5%/V and relative error within ±1% were obtained for DC voltage up to 200 V. It was also clarified that these characteristics satisfy the JEC1201-1PS standard accuracy.