imped ance bridg e (HP- 4194A, Hewle tt-Packard Developm ent
Company , CA), d the thickness of the porous PZT disk and S
is the area of the electrode. The transverse piezoelectric strain
coefficient (d31) was determined from the values of resonant
and anti-resonant vibration frequencies, density, diameter and
dielectric constant. The parameters hydrostatic strain coeffi-
cient (dh ¼ d33+2d31), hydrostatic voltage coefficient (gh ¼ dh/
ε0εr), hydrostatic figure of merit (HFOM ¼ dhgh) and acoustic
impedance (Z) were calculated from the measured values and
other physical parameters.
imped ance bridg e (HP- 4194A, Hewle tt-Packard Developm ent
Company , CA), d the thickness of the porous PZT disk and S
is the area of the electrode. The transverse piezoelectric strain
coefficient (d31) was determined from the values of resonant
and anti-resonant vibration frequencies, density, diameter and
dielectric constant. The parameters hydrostatic strain coeffi-
cient (dh ¼ d33+2d31), hydrostatic voltage coefficient (gh ¼ dh/
ε0εr), hydrostatic figure of merit (HFOM ¼ dhgh) and acoustic
impedance (Z) were calculated from the measured values and
other physical parameters.
การแปล กรุณารอสักครู่..
