Title :
The time evolution of the pyroelectric response induced by a laser pulse irradiation in a VDF/TrFE copolymer
Author :
Takahashi, Yoshiyuki ; Hiraoka, Kojiro ; Furukawa, Takeo
Author_Institution :
Fac. of Sci., Sci. Univ. of Tokyo, Japan
Abstract :
The pyroelectric response induced by a YAG laser pulse irradiation has been measured over a bread range of 1ns-10s for a VDF/TrFE copolymer with composition 75/25 mol%. The time spectra contain two damped oscillations associated with thickness and length extension mode piezoelectric resonance. Removing such components by means of Fourier analysis has revealed two kinds of pyroelectric responses, the instantaneous component appearing prior to thermal expansion and the gradually increasing component reflecting fluctuations of crystalline dipoles
Keywords :
laser beam effects; polymer blends; polymer films; pyroelectricity; 1 ns to 10 s; Fourier analysis; VDF/TrFE copolymer; YAG laser pulse irradiation; crystalline dipole fluctuations; damped oscillations; piezoelectric resonance; pyroelectric response; thermal expansion; time spectrum; Charge measurement; Current measurement; Ferroelectric materials; Laser theory; Optical pulses; Pulse measurements; Pyroelectricity; Resistors; Resonance; Time measurement;
Conference_Titel :
Electrets, 1996. (ISE 9), 9th International Symposium on
Conference_Location :
Shanghai
Print_ISBN :
0-7803-2695-4
DOI :
10.1109/ISE.1996.578241
