Biomedical Engineering Reference
In-Depth Information
0
30
1.0
°
60°
90°
0.8
0.6
0.4
0.2
0
F
2F
Force amplitude
3F
Figure 3.10
Variation of output voltage of the uniaxial piezoelectric PVDF film versus force
amplitude for different PVDF deviation angles
V
total
V
d
31
V
d
32
1.0
0.8
0.6
0.4
0.2
0
0 0 0 0 0
Orientation angle (degree)
50
60
70
80
90
Figure 3.11
Variation of output voltage of the uniaxial piezoelectric PVDF film versus force
amplitude for different PVDF deviation angles. The total voltage
(V
total
)
, as well as its components
associated with coefficients
d
31
(V
d31
)and
d
32
(V
d32
) are separately plotted
be seen that the maximum difference between the total output voltage and the voltage
induced by
d
31
is at
θ
=90
◦
and is equal to 4.5%. The voltage component resulting from
the
d
33
coefficient is close to 0 which is similar to biaxial PVDF film behavior. In many
applications in which the uniaxial PVDF film experiences merely a uniaxial tension, it is
preferable to affix the film in such a way that its material coordinate system coincides
with the global coordinate system, where the deviation angle is 0.
