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

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

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


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.

Original languageEnglish
Pages (from-to)437-444
Number of pages8
JournalTechnisches Messen
Issue number9
StatePublished - Sep 2007


  • Polarization
  • Space charge
  • Thermal-pulse tomography


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