Piezo electric Materials

We have studied about piezoelectric crystal and piezoelectric effect, that is if we apply stress on one axis (mechanical axis )of the crystal then proportional electric field gets induced in perpendicular direction(on electrical axis) and vice versa..

These axes are set during the process called “Poling”..

Some of the commonly used piezo electric materials are quartz, Rochelle salts etc..

ok lets talk data, how much voltage and current is produced?

This is how a piezo material looks like used in hand watches, and we are going to see that how much voltage can it produce..

In normal condition

 

??? I was wondering why its showing voltages… Then i realised oops ceiling fan is ON, and the fluctuating voltage created is due to the air pressure, Then after putting the Fan off

 

Now we are ready to apply stress,  I applied moderate stress, thinking that the crystal should not get damage..

 

Did you see that…

:O    these are the peak voltages.. snapshot from above video

Now we will glow an LED like in this article http://www.josepino.com/projects/electricity-from-piezoelectric

For this we will need an LED, Here i have chosen a RED Led

Test the LED if its OK or not

    

Attach the terminals of led to the ourter and inner surface of material, i tested and it doesnt matter which terminal u connect to which, because its fluctating in nature and LED will glow only for that portion in which Anode gets higher voltage than cathode(by .7 V)

The final result