A possible non-contact measuring technique for the variation of the electric field due to corona discharge by use of Pockels sensor

摘要

In this paper, a novel optical measuring system based on the electro-optic effect has been proposed and realized using a Pockels cell with a view to detecting a partial discharge taking place at the needle plane electrode. This system has the following advantages; nonmetallic probe sensor immune to external EMI noise and broad band response of the Pockels cell from DC to GHz. It consists of a He-Ne laser, optical fiber, LiNbO/sub 3/ Pockels cell, photodetector, grin lens, oscilloscope and PC. The characteristics of the developed prototype sensor are investigated under AC and corona discharges.