Title :
Thermal wave methods: some experimental pitfalls
Author :
WÜbbenhorst, M. ; van Turnhout, J.
Author_Institution :
Dept. of Polymer Technol., Delft Univ. of Technol., Netherlands
Abstract :
Uncertainties in the spatial distributions calculated from thermal wave data are normally attributed to the ill-posed deconvolution problem. This paper focusses on the impact of “ill-posed” experimental conditions on the pyroelectric spectra. The spectra are affected by structural inhomogeneities and temporal changes in the electrical and thermal properties, by distortions caused by the electric circuit, by frequency-dependent properties and by piezoelectricity. Experimental results are given for PVDF and LiTaO3. Suggestions are made to reduce the effect of experimental errors
Keywords :
dielectric polarisation; electrets; lithium compounds; piezoelectric materials; polymers; pyroelectricity; thermally stimulated currents; LiTaO3; PVDF; frequency-dependent properties; ill-posed deconvolution problem; piezoelectricity; pyroelectric spectra; spatial distributions; structural inhomogeneities; temporal changes; Deconvolution; Dielectric losses; Frequency; Permittivity; Plastics; Polarization; Polymers; Pyroelectricity; Space charge; Spatial resolution;
Conference_Titel :
Electrets, 1994. (ISE 8), 8th International Symposium on
Conference_Location :
Paris
Print_ISBN :
0-7803-1940-0
DOI :
10.1109/ISE.1994.514765
