Time evolution of laser-induced pyroelectric responses in a VDF/TrFE copolymer

Author

Takahashi, Y. ; Hiraoka, K. ; Furukawa, T.

Author_Institution

Fac. of Sci., Sci. Univ. of Tokyo, Japan

Volume

5

Issue

6

fYear

1998

fDate

12/1/1998 12:00:00 AM

Firstpage

957

Lastpage

960

Abstract

Pyroelectric charge response induced by instantaneous heating using YAG laser pulse (7 ns) irradiation has been measured over a 1 ns to 10 s time range for a VDF/TrFE copolymer with composition 75/25 mol%. The observed spectra exhibited two damped oscillations associated with thermal expansion in the thickness and length directions coupled with piezoelectric effects. Removing these two components revealed pyroelectric responses consisting of an instantaneous component followed by a gradually increasing component. The instantaneous component appearing in parallel with the integrated laser intensity was attributed to primary pyroelectricity whose response time was <1 ns. The gradual component with time constant 200 ns was attributed to the relaxational nature of molecules and heat transfer from the electrode

Keywords

dielectric polarisation; laser beam effects; polymer blends; pyroelectric devices; pyroelectricity; thermal expansion; 1 to 10 ns; VDF/TrFE copolymer; damped oscillations; heat transfer; instantaneous heating; integrated laser intensity; laser-induced pyroelectric responses; piezoelectric effects; primary pyroelectricity; relaxational nature; thermal expansion; Charge measurement; Current measurement; Delay; Heating; Optical pulses; Piezoelectric effect; Pulse measurements; Pyroelectricity; Thermal expansion; Time measurement;

fLanguage

English

Journal_Title

Dielectrics and Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

1070-9878

Type

jour

DOI

10.1109/94.740782

Filename

740782