Coupled Temperature/Space Charge Measurements in Dielectrics using a Thermal Step applied by a Coolant Liquid

High accuracies and spatial resolutions can be reached in space charge distribution measurements with thermal methods. However, they require efficient thermal transfer and the determination of an accurate temperature profile throughout the material, involving direct measurements of the surface temperature. In this paper, we show that direct and coupled measurements of the surface temperature at the electrode of a flat sample thermally excited by a liquid and of the space charge signal can be carried out. The problem background is first addressed, then the experimental set-up is detailed and experimental results are presented and discussed.