Dresden 2006 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 13: POSTER New Experimental Techniques
CPP 13.7: Poster
Dienstag, 28. März 2006, 17:00–19:00, P3
Pyroelectric tomography: Non-destructive 3D mapping of polarization profiles in poled polyvinylidene fluoride copolymer sensor cables — •Rosaura Flores Suárez, Michael Wegener, Werner Wirges, and Axel Mellinger — Department of Physics, University of Potsdam, Am Neuen Palais 10, 14469 Potsdam
The copolymers of polyvinylidenefluoride (PVDF) with trifluoroethylene are very attractive for sensor applications because they do not need to be stretched in order to become piezoelectric and may therefore be directly coated onto substrates or wires. P(VDF-TrFE) sensor cables may be used in such applications as traffic control or intruder monitoring in which their flexibility and rigidity as well as their rather high load tolerance are essential. In the present work, 3D polarization profiles in poled P(VDF-TrFE) sensor cables (diameter approx. 1.1 mm, thickness of the active layer approx. 200 µm) were measured by means of the focused thermal-pulse (TP) method [1] with a lateral resolution of 44 µm. The relatively high data acquisition speed allowed the recording of up to 2 kPixels of in-plane data. The investigated sensor cables included samples poled with an industrial 4-needle corona setup, as well as samples poled under laboratory conditions using a single needle at voltages of −25 kV and −60 kV under different atmospheres (air and SF6, respectively). By studying the polarization “footprints” of the corona needles. optimum poling geometries could be deduced.
[1] A. Mellinger, R. Singh, M. Wegener, W. Wirges, R Gerhard-Multhaupt and S. B. Lang, Appl. Phys. Lett. 86, 082903 (2005).