“ELECTRONIC NOSE”PRESENTED BY

S.VENKTESWARLU

Over the last decade, "electronic sensing" or “E-sensing" technologies have undergone important developments from a technical and commercial point of view

The First idea for E- sensing comes on 1914 Since 1982 research has been conducted to

develop E-sensing technologies

History

Different existing gas detection methods such as

Gas chromatography (GC) Mass spectrometry (MS) GC-MS Method Ion mobility spectrometry (IMS) etc

GAS DETECTION METHODS

5 Human Senses

Human Senses were replaced by E-senses such as

EYE-------> Camera Hear------> Microphone Touch-----> Thermometer Taste -----> E-Tongue Smell-----> E-Nose

E-sensing Replacements

Human olfactory systems have large numbers of organs in the (10 Millions for humans, 100 Millions dog).

There are 1000 different organs (We smell in 1000 different “odor”).

Working

Works on non seperative mechanism Each odour has its unique identification as

same as finger print No two odours have same properties By this we can analyze the flavour

Principle

The major three components of E-nose are

1. Sampling Deliver system 2.Detection System 3.Computing system

Major Components

The sample delivery system enables the generation of the volatile compounds

The system then injects this headspace into the detection system of the electronic nose.

Sampling Deliver System

It consists of a sensor set to react It is the "reactive" part of the instrument The sensors react when odour detects which means the sensors experience a

change of electrical properties.

The detection system

Here MOSFET used to amplify the signals Change in odour leads to change in sensor

electrical property (either positive or negative)

This change directly given to the MOSFET to amplify the signal

For weak signals (low concentrated signals)

It is used to match the recognised pattern with predefined patterns and give appropriate results

Computing System

Applications

A few applications of E-Nose are

Medical Diagnostics Food Processing Industries Explosive Detection Chemical Research Laboratories Quality Control Laboratories etc

Applications

Some types of Cancer detection such as lung cancer

Harmful Bacteria detection

Future applications

High cost Low range application area

Complex city in matching odour patterns

Challenges with current E-Nose

E-Nose is one of the major invention which can capable to sense the human senses

It can help the modern world to solve many problems and save more valuable lives.

This is not a device which completely replace the human sense but most of cases it is possible.

Conclusion

THANK YOU