Sound or popularly known to us as noise is one of the widely available energy sources which have its range extending al-most to infinity. The noise is considered to be a great contribu-tor in the increasing pollution which is studied under the cat-egory of noise pollution. Let us first understand the basic definition of sound. Sound basically is mechanical wave that is an oscillation of pressure transmitted through some medium (like air or water), com-posed of frequencies which are within the range of hearing. Thus, considering sound as the wave we can imagine it as the flow of energy from one point to another with the help of a medium as air. The sound waves can be longitudinal as well as transverse as per direction of vibration of the sound parti-cles called phonons. Sound that is perceptible by humans has frequencies from about 20 Hz to 20,000 Hz. In air at standard temperature and pressure, the corresponding wavelengths of sound waves range from 17 m to 17 mm.

1. SOUND TO ELECTRICITY CONVERSION
TECHNICAL SEMINAR PRESENTATION
ON
Presented by:
Shreedhar Subhas
Electronics and Communication Engineering

2. CAN YOU IMAGINE YOUR LIFE WITHOUT YOUR COMPUTER,
MOBILE, LIGHTS AND OTHER DAILY USED APPLIANCES, IT
IS REALLY VERY HARD TO IMAGINE OUR LIFE WITHOUT
THESE ELECTRIC APPLIANCES.
ELECTRIC CONSUMPTION IS INCREASING DRASTICALLY,
ON THE OTHER HAND PRODUCTION OF ELECTRIC POWER
IS LIMITED.
IT’S TIME TO THINK OF SOME ALTERNATIVE AND GREEN.
HERE WE ARE INTRODUCING AN ALTERNATIVE :
SOUND!!!

3. INRODUCTION
* BASIC DEFINATION OFSound!!!
where can we harvest sound ?
every where around us ..
Industries
Thermal plants
Nuclear plants Explosions
Roads
Auditorium

4. AIM: TO CONVERT SOUND ENERGY TO
ELECTRICAL ENERGY
PRINCIPLE
AS SOUND WAVE IS A MECHANICAL WAVE WHEN IT TRAVELS
THROUGH A MEDIUM IT DISTURBS THE PARTICLE OF THE MEDIUM
THESE DISTURBANCE CREATED BY SOUND COULD BE USED TO
PRODUCE ELECTRICITY BY THE LAW OF THERMODYNAMICS.
IN OUR DAILY USE WE USE MANY PRODUCTS IN WHICH THE
CONVERSION BETWEEN SOUND ENERGY AND ELECTRIC ENERGY
TAKES PLACE FOR E.G.:-
MIC , SPEAKER , MOBILE PHONE ,TRANSDUCERS.

5. METHODOLOGIES

7. METHODS OF CONVERSION
1. USE OF DIAPHRAGM
• SUPPOSE WE CREATE A VERY THIN CURTAIN LIKE DIAPHRAGM WHICH
WILL GET FLUCTUATED BY THE OSCILLATION AND PRESSURE CREATED
BY SOUND WAVE.
• A CONDUCTOR WILL BE ATTACHED TO IT WHICH WILL BE PLACED
BETWEEN MAGNETIC BARS THESE FLUCTUATION WILL CREATE A
MOVEMENT IN CONDUCTOR WHICH WILL AFFECT THE MAGNETIC FIELD
OF THE MAGNET THIS WILL GENERATE MOTIONAL EMF AND WILL
GENERATE VOLTAGE ACROSS IT.
• GENERATED VOLTAGE (EMF) = (VELOCITY OF CONDUCTOR) X (MAGNETIC
FIELD) X (LENGTH OF CONDUCTOR)
• AS THE FREQUENCY INCREASES THE MOVEMENT WILL BE FAST. IT WE
WILL PRODUCE APPRECIABLE AMOUNT OF ELECTRIC ENERGY. IT
WOULD WORK SIMILAR AS THE WORKING OF TURBINE. BUT ITS
LIMITATION WILL BE THAT IT WILL BE EFFICIENT ONLY IN THE PLACE

8. Force (sound)
Method 1:

9. Method 2:
Sound Heat Electricity

10. Sound Piezo Electric Electricity
Method 3:

11. PIEZOELECTRIC MATERIAL
• PIEZOELECTRIC MATERIALS ARE TRANSDUCERS, ITS’S
CRYSTALS COULD CONVERT MECHANICAL STRAIN TO
ELECTRICITY.
• THE CRYSTALS ARE FORMED NATURALLY E.G. QUARTZ,
BONE, DNA.
• AS WELL AS ARTIFICIALLY ZnO, Lithium Nibatet etc…
PROPERTIES
PIEZOELECTRIC EFFECT
WHEN THE CRYSTAL IS MECHANICALLY STRAINED (BY SOUND)
OR WHEN IT IS DEFORMED BY THE APPLICATION OF AN
EXTERNAL STRESS, ELECTRIC CHARGES APPEAR ON THE
CRYSTALS SURFACES.

12. PIEZO ELECTRIC
EFFECT

13. HOW MUCH ENERGY CAN BE PRODUCED..??
DISTANCE
(cm)
RESONANT
FREQUENCY
(Hz)
SOUND
INTENSITY
(dB)
OUTPUT
VOLTAGE
(mV)
1 374 200 91.0
3 375 100 55.7
5 376 100 30.0

14. SOME MORE INFORMATION
• SCIENTISTS AT QUEEN MARY UNIVERSITY LONDON IN COLLABORATION
WITH NOKIA ARE WORKING ON A DEVICE FROM WHICH MOBILE PHONES
CAN BE CHARGED BY SOUND.
• THIS DEVICE USES ZINC OXIDE TO PRODUCE ELECTRICITY WHEN SUBJECTED
TO SOUND.
• THE DEVICE IS OF SAME SIZE AS NOKIA LUMIA 925

15. • SMARTPHONES ARE VERY CRUCIAL THESE DAYS AND THEIR BATTERY
PROBLEM IS VERY COMMON.
• IN NEAR FUTURE ITS POSSIBLE THAT WE MAY CHARGE OUR CELL PHONES BY
THE SOUND AT ROCK CONCERTS BY USING THIS TECHNOLOGY.

16. IT’S SCOPE
• IT COULD HELP US TO REDUCE THE SCARCITY OF ELECTRICAL ENERGY
GLOBALLY AND HELP IN THE DEVELOPMENT OF MANKIND.
• THE NOISE POLLUTION IN THE ROAD WOULD BE ABLE TO CONVERT
INTO ELECTRIC ENERGY AND LIGHTS THE STREET LIGHTNING,
SIGNALS.
• THE ELECTRICITY PRODUCE IN NUCLEAR POWER STATION COULD
INCREASE AS THE SOUND PRODUCE DURING NUCLEAR FISSION ALSO
COULD BE USED TO GET MORE ELECTRIC ENERGY.
• THE NOISE POLLUTION IN INDUSTRIES COULD BE USED TO PRODUCE
ELECTRICITY AND WORK CERTAIN LOW VOLTAGE MACHINE.
• ITS SCOPE DOESN’T END…

17. DEMERITS
• VOLTAGE GENERATED IS VERY LOW.
• ITS EFFICIENCY IS NOT THAT GOOD SO IMPROVEMENT IS
BEING REQUIRED.
• IT COULD NOT BE USED IN THE PLACES WHERE DECIBEL
OF SOUND IS VERY VERY LOW.
• IT IS BIT COSTLIER.

18. CONCLUSION
THE SOUND ENERGY IS THE UNEXPLORED
SOURCE WHICH HAS ENORMOUS POTENTIAL TO
MEET THE FUTURE GROWING REQUIREMENTS OF
THE ELECTRICITY AND SERVE AS THE ECO-
FRIENDLY AND RENEWABLE SOURCE OF ENERGY.

19. REFERENCES
1. Piezo materials-(1.)Mael guennou- titzeff.
2. Revathi G, Ingitham R” Piezoelectric Energy Harvesting System in Mobiles
with Keypad and Sound Vibrations” International Journal of Engineering
Research & Technology (IJERT)Vol. 1 Issue 4, June – 2012
3. A course in electrical and electronics measurement and instrumentation –
A.K.SAWHNEY DIAPHRAGM AND PIEZOELECTRIC EFFECTS.
4. Introduction to measurements and instrumentation- A.K.GHOSH, PHI

20. THANK YOU