Piezoelectric EffectBy B SRI JYOTHSNA15011D2003 JNTU, HYDERABAD

Soft Skills Lab - Presentation

Piezoelectricity ???

Ability to generate an electric charge in response to applied mechanical stress.

‘Piezo’ derived from Greek word ‘piezein’ meaning “push”

Reversible i.e,

converse of Piezoelectric effect

Mechanical force Electricity

Piezoelectric effect

Electricity Mechanical strain

Converse of Piezoelectric effect

Piezoelectric Materials

Crystals which acquire a charge

when compressed, twisted or distorted

and vice versa

Quartz

Silk

Enamel

Barium Titanate(BaTiO3)

Principle behind this effect ??

When a mechanical force like a vibration is applied on the material it polarizes.

when the force is released flow of ions takes place and electric current flows through the crystal.

Applications

Converse of Piezoelectric effect is used in Quartz watches

To detect wear in train wheels by detecting the change in vibration behavior of the entire

wheel by generating mode shapes

Gyms, dance floors etc can be laid with crystals below the floor or tiles.This energy can be used to power the equipment in the place.

Piezoelectric Microphone- sound sensor- sound waves bend the

crystal- creates a changing

voltage.

Used in ultrasonic transducers - medical ultrasound

imaging- Non Destructive Tests in

constructions

Piezoelectricity is a source of “Green

energy”

Flexible Piezo materials withstand large deformations

Conclusion

Thank You!