3. Piezoelectricity was discovered by Curie brothers in
1880.
It is the generation of electric field from applied
pressure.
It is observed in crystalline material with no inversion
symmetry.
The internal generation of a mechanical strain
resulting from an applied electrical field.
6. The positive & negative charges are symmetrically distributed
in a crystal.
Piezoelectric sensor are not piezoelectric until the random
ferroelectric domains are aligned by a process known as
poling.
Poling consists of inducing a dc voltage across the material.
7. When pressure is applied on the piezoelectric sensor
a negative charge is produced .
The charge goes through the rectifier which rectified
the charge AC to DC .
The capacitor is used to stabilized the charge .
When the circuit is closed the charge pass through
the capacitor and from the switch as a result the LED
will glow.
8.
9.
10. Charging pad (piezoelectric
sensor) are under the
footpaths collecting the
energy from the vibration.
Charging pads are connected
with lithium ions
batteries(which can be used
further)
11. Vibration caused by the
machines in gym.
At work place
piezoelectric sensors are
laid on the chairs.
Using the vibration of the
vehicle like clutches and
gears etc.
12. Piezoelectric crystals
are laid under the
mobile key and
keyboard.
For every key vibration
created .
These vibration can be
use for charging
purpose.
13. Idea was researched in USA.
To power the battle field
equipment by generators
embedded in the soldiers
boots.
The idea then abounded due
to discomfort.
Boots with comfort and with
this features are invented.
14. The output voltage from one piezoelectric crystal in
millivolts(mv) range , which is different for different
crystals .
And the wattage is microwatt range.
In order to achieve greater voltage piezoelectric
crystal can be placed in series.
Use charged batteries for backup supplies.
15. It is unaffected by external magnetic field.
It is pollution free.
It has low maintenance.
Easily replacement of equipments.
It is small in size.
It has good frequency response.
16. It can’t be used for truly static measurements.
Temperature sensitivity.
It can be cracked if overstress is applied.
The crystal give off voltage but it’s not a battery.
There is very little energy available.
May get effected by long use in high temperature.
17. Piezoelectric is a very revolutionary source of green
energy.
With low cost energy can be generated and without
polluting the environment.
It can be used on daily basis converting the
surrounding vibrating energy to electrical energy.
And can be used for other works or can be stored for
further uses.
