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Determination of the Zero-Field Position in an Insulating Film by Thermally Stimulated Surface Potential Measurement in the Presence of a Temperature Gradient

A new technique for measuring the zero-field position in an insulating film is proposed. The technique consists of thermally stimulated surface potential measurement in the presence of a constant temperature gradient (TG-TSSP measurement) and it does not depend on sample thickness. Using a low-density polyethylene (LDPE) film having thickness d= 0.3 mm, the zero-field position vs. collecting voltage characteristic was measured and the electric field in the sample was determined.