LIPP investigation of piezoelectricity distributions in PVDF poled with various methods

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Abstract
Laser-induced pressure pulses (LIPP's) were used to investigate the distribution of polarization and piezoelectric e-constant in the thickness direction of 22 μm thick films of polyvinylidenefluoride (PVDF) with a resolution of 1 to 2 μm. The samples were poled with four different methods, namely a newly developed electron beam technique and the older field, thermal, and corona methods. Results obtained on such samples indicate the existence of different distributions of the piezoelectricity or polarization, ranging from highly uniform profiles for the field-poled samples to step-shaped (monomorph-type) or bidrectional (bimorph-type) distributions for the electron-beam poled samples. The results demonstrate the influence of the fields set up by space charge on the poling process.