Application of the Pockels Effect to High Voltage Measurement

The traditional way to measure an electric field electrically disturbs the original field, so that can cause a number of measuring problems. Using a Pockels´ crystal to measure an electric field has several advantages over electrical methods, such as interference from electromagnetic radiation, high sensitivity and wide frequency bandwidth. This paper presents a kind of new optical method for measuring electric voltage, current and power, and this new method makes the Sensing Technology on Pockels effect and optical Technology together. The study shows that this kind of method can be used to measure the electric voltage, current and power when the voltage is high and/or the current is large. And a comparison is made between transverse Pockels effect and longitudinal Pockels effect. Electric-optic effect voltage measurement system is designed based on longitudinal Pockels high-voltage measurement methods odotThese methods can applying to high-voltage levels up to 400 kV in a wide bandwidth between dc to30 MHz is developed. In addition, an excellent agreement is observed between the measured and predicted values.