Title :
Thermal-pulse tomography of polarization distributions in a cylindrical geometry
Author :
Suárez, Rosaura Flores ; Mellinger, Axel ; Wegener, Michael ; Wirges, Werner ; Gerhard-Multhaupt, Reimund ; Singh, Rajeev
Author_Institution :
Dept. of Phys., Univ. of Potsam, Potsdam
Abstract :
Fast, three-dimensional polarization mapping in piezoelectric sensor cables was performed by means of the novel thermal-pulse tomography (TPT) technique with a lateral resolution of 200 mum. The active piezoelectric cable material (a copolymer of polyvinylidene fluoride with trifluoroethylene) was electrically poled with a point-to-cable corona discharge. A focused laser was employed to heat the opaque outer electrode, and the short-circuit current generated by the thermal pulse was used to obtain 3D polarization maps via the scale transformation method. The article describes the TPT technique as a fast non-destructive option for studying cylindrical geometries
Keywords :
corona; dielectric polarisation; electrodes; laser beam applications; nondestructive testing; piezoelectric devices; polymers; power cable testing; pyroelectricity; short-circuit currents; tomography; copolymer; corona discharge; cylindrical geometry; electrical poling; electrode; laser heating; nondestructive option; piezoelectric sensor cable; polarization distribution; polyvinylidene fluoride; pyroelectric effect; scale transformation method; short-circuit current; thermal-pulse tomography; trifluoroethylene; Cables; Corona; Geometrical optics; Geometry; Optical materials; Optical pulse generation; Piezoelectric materials; Piezoelectric polarization; Thermal sensors; Tomography;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
DOI :
10.1109/TDEI.2006.247828
