Piezoelectricity

1
Piezoelectricity

• Material from
• 3.6 Piezoeelctric effect
• 8.4 Piezoelectric accelerometer
• Appendix A
• Extra material on porous polypropylene

2
Porous polypropylene
3
Effect of tension
-F
Increased voltage
------
Increased polarization
-F
4
Piezoeectric coefficient
Displaced Charge
-F
V
Polarization/Volume
Force/Area
------
Increased polarization
z
-F
Piezoelectric coefficient
5
Quartz (SiO2)
6
PZT
7
Poling
8
PVDF
9
Piezoelektric accelerometer
10
Piezoelectric tensor
11
Bending mode
12
The converse effect (electro-gtpiezo)
f
V
E
f
13
Material Parameters