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Axel Mellinger, Rosaura Flores Suarez, Rajeev Singh, Michael Wegener, Werner Wirges, Reimund Gerhard-Multhaupt

Non-destructive Space-charge and Polarization Tomography with Thermal Pulses

Keywords: thermal-pulse tomography, polarization, space charge

Non-destructive, three-dimensional imaging of space-charge and polarization distributions in electret materials has been implemented by means of laser-induced thermal pulses. In pyroelectric films of poled poly(vinylidene fluoride), images of up to 45 × 45 pixels with a depth resolution of less than 0.5 μm and a lateral resolution of 40 μm 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.

tm – Technisches Messen, Oldenbourg Wissenschaftsverlag

Print ISSN: 0171-8096
Volume: 74, 09/2007
Pages: 437 - 444

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