2. CONTENTS
• Introduction
• Definition and basic design of e-nose
• Comparison of e-nose with biological nose
• Working principle
• Sensor technology in an e-nose
• Applications
• Conclusion
8. WORKING
It is a multi sensor, sensor fusion based system with a feature
extraction pre-processor feeding data to an algorithm bank.
9.
10.
11. CATEGORIES
• Electronic nose sensors fall in four categories:-
• Conductivity Sensors
• Piezo Electric Sensors
• MOSFET Sensors
• Optical Sensors.
12. CONDUCTIVITY SENSORS
• There are two types of conductivity sensors.
A]. Polymer Sensor
Changes in the conductivity of materials
occur as they are exposed to various types of chemicals,
which bond with the polymer backbone. The bonding may be
ionic or in some cases, covalent. The Interaction affects the
transform of electrons along the polymer chain, that is to say
its conductivity is strongly influenced by the counter – ions
and functional groups attached to the polymer backbone.
13. B] METAL OXIDE SENSOR
Typical metal Oxide sensors include oxides of tin, zinc, titanium,
tungsten and Iridium doped with a noble metal catalyst such as
platinum or palladium.
14. PIEZO ELECTRICAL SENSORS
• The Piezoelectric family of sensors also has two
members:
A] Quarts Crystal Microbalance (QCM)
B] Surface Acoustic-wave (SAW)
They can measure temperature mass changes,
pressure, force and acceleration but in the electronic once,
they are configured as mass-change-sensing device.
27. ACKNOWLEDGEMENT
On preparing this presentation on “E-NOSE” we
have gained quite some knowledge on this topic
which we were unaware of before. We found it
quite interesting and would like to explore more
about it in the future.
