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Non-destructive space-charge and polarization tomography with thermal pulses

: Mellinger, A.; Suarez, R.F.; Singh, R.; Wegener, M.; Wirges, W.; Gerhard, R.


Technisches Messen : TM 74 (2007), No.9, pp.437-444
ISSN: 0340-837X
ISSN: 0171-8096 (Print)
ISSN: 2196-7113 (Online)
Journal Article
Fraunhofer IAP ()

Non-destructive, three-dimensional imaging of space-charge and polarization distributions in elec-tret materials has been implemented by means of laser-induced thermal pulses. In pyroelectric films of poled poly(vinylidene fluoride), images of up to 45 x 45 pixels with a depth resolution of less than 0.5 |xm and a lateral resolution of 40 |xm were recorded, the latter being limited by fast thermal diffusion in the absorbing metallic front electrode. Initial applications include the analysis of polarization distributions in corona-poled piezoelectric sensor cables and the detection of patterned space-charge distributions in polytetrafluoroethylene films.