Investigation the Performance of Electro-Optical AC Voltage LiNbO3 Sensor Based on Pockels Effect

Abstract

In contrast to conventional voltage sensor technology (e.g., inductive voltage transformers or capacitive voltage transformers), optical sensors have inherent and advantageous features, such as wider bandwidth, larger dynamic range and lighter weight. The aim of this work is to implement an AC voltage sensor based on Pockels electro-optic effect in LiNbO3 crystal. The research has been conducted in two ways .The first way is the installation tested uses external electrodes and a He-Ne laser as a light source, whereas the second way is by using the direct voltage application to the metalized sides of the LiNbO3 crystal built into an optic cell. Results of both tests shows that by using the direct voltage application to the metalized sides of the LiNbO3 crystal built into an optic cell led to better repeatability of voltage measurements and corresponds to more realistic conditions.

Keywords

• Pockels electro-optic effect
• He-Ne laser
• AC voltage sensor