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Measurement of polarization charge density at the interface between PET-film and electrode with a thin air layer by PEA method

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3 Author(s)
K. Kadowaki ; Ehime Univ., Matsuyama, Japan ; S. Nishimoto ; I. Kitani

Surface charge density on a 25 μm PET film due to polarization was measured by a PEA method. In order to separate a pressure wave due to charges on the film from that due to charges on the adjacent electrode, a very thin air layer less than 1 μm at the interface was utilized as an acoustic barrier. A linear relationship between the charge density due to polarization of the film and the applied voltage below 3 kV was observed. When the applied voltage exceeded 4 kV, the charge density on the film was saturated because the opposite polarity charges were injected from an adjacent electrode. The value of 4 kV gave a critical field strength across the interface for the charge injection up to 5×108 V/m

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Properties and Applications of Dielectric Materials, 2000. Proceedings of the 6th International Conference on  (Volume:1 )

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