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Measurements of frozen-in polarization in PET electrets using E-j method

Motyl E.

Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje

2004

Vol. 40, nr 15

41-45

Step elcctroacoustic (SEA) and thermally stimulated depolarisation (TSD) techniques were applied for analysis of electret slate in polyethylene-terephthalate samples after corona charging at low and high temperatures. Measurements of electric field distributions E and current density jTSD during thermally stimulated discharging allow to get information on real charge density and quasi-frozen polarisation in dielectric. The above E-j method is a useful tool for measurement of local values of real and polarization charges in PET electrets and their decay in time. Positive and negative coronas as well as temperature of charging affect the storage of real charges and polarisation in PET electrets.