Piezoelectricity Material from 3.6 Piezoelectric effect

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Presentation transcript:

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

Porous polypropylene ------ E ++++ Voltage q , ------ d ++++ p = dq Polarization/dipoles

Effect of tension ------ -F E Increased ++++ voltage Increased ------ polarization ------ ++++ p -F

Polarisasjonstetthet/ overflateladning +σ A + - + - p + - + - d d + - + - + - + - -σ p: dipolmoment/volumenhet σ: flateladning (Q= σA) Totalt dipolmoment: Totalt dipolmoment:

Piezoeectric coefficient Displaced Charge ++++ ------ E Increased voltage in terms of displaced charge Capacitance -F V Polarization Force/Area Increased polarization ------ ++++ p z -F Piezoelectric coefficient

Quartz (SiO2)

PZT

Poling

PVDF

Piezoelektric accelerometer

Piezoelectric tensor

Bending mode

The converse effect (electro->piezo)

Material Parameters