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In this paper we describe the polynomial and regularized discrete solutions of the thermal wave probing problem found in the investigation of polarization and space charge in dielectrics. We demonstrate that approximate low order polynomial solutions can be obtained in the presence of noise and without regularization. We also demonstrate a more general discrete solution with explicit regularization...
Electric field and space charge profiles were measured in 110 mum thick planar XLPE samples machined from the insulation of power transmission cables. The samples carried vacuum-evaporated aluminium electrodes, and were poled at field-strengths around 50 kV/mm (both polarities) for periods up to 48 hr. The electric field and space charge profiles were measured using the LIMM technique. The experimental...
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