Spatiotemporal Surface Charge Measurement in Two Types of Dielectric Barrier Discharges Using Pockels Effect

摘要

The longitudinal electro-optic modulator technique based on Pockels effect has been applied for measuring the surface charge density in two types of dielectric barrier discharges: volume and coplanar. Discharges were generated in noble gases such as helium, neon and argon at pressures of a few hundreds of Torr. It is shown that the thickness of electro-optical crystal used determines not only the spatial resolution of the method, but also affects the value of surface charge density.