Generation of microdischarges in porous materials

Formation of microdischarges in porous dielectric materials generated by dc high voltage has been investigated. Two geometrical configurations (sandwich type and corona type) and several materials with different pore size and thickness have been tested. The I-V characteristics and current pulse characteristics have been recorded and supplemented with the photographs of the discharge. Stable microdischarges have been successfully generated only using materials with a certain pore size and in the limited range of the I-V characteristics.