Electronics noses are

1. In this ever developing world, electronic devices are duplicating every sense of
perception,
So why the sense of smell will lag behind . Now electronic devices can also
smell like our nose.
This devices are known as E-nose or the electronic nose.

2. So why we need sensing? Conventional olfactory research labs need to literally
smell samples
And for this they were only relying on human nose, but as we know human
nose cant take the risk of smelling
some harmful substances and it also cant be used for continuous monitoring.
So electronic nose has to replace the human nose.

3. So we have to make the an electronic circuit that will mimic the human nose,
i.e. odour is perceived as a global fingerprint.
For this We use some transducers, signal processing units, sensor arrays and
pattern recognition systems.

4. Now wats the difference between a human nose and an electronic nose??
Humans have epithelial olfactory receptor in the nasal chamber where the
odour is received
And the mitral cells and cortex neurons converts this smell to a perception and
we became able to identify
The smell. Similarly in the electronic nose, dour is received by chemical
sensors in sensor channel and with the help
Of feature extraction and pattern recognition algorithm, that smell is converted
into some analog signals.

5. Now we will discuss about how an electronic nose smells.??
The E-nose consists of 3 units such as
1.Sample delivery unit
2.Detection unit and
3.A computing unit
The sample delivery unit generates the volatile compounds of a sample. It is
essential to guarantee
Constant operating conditions.
The detection unit consists of a sensor set . When in contact with the volatile
compounds, the sensors react which means they

6. The electronic nose system uses the following types of sensors such as
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And here is the pictures of some of the sensors

7. Data aquisations can be done in various ways. Datas are transferred from the e-
nose to the computer
By the help of serial ports, parralel ports, ir, bluetooth, wifi etc. the computer
generates a signal and identifies the odour.

8. Now comes the actual experimental setup.
We use 4 types of sensors that are---
Sample delivery system
Computing units

9. These are some of the experimental output signals of 8 types of coffee smell
datas.
All the graphs are measured in voltage v/s time.

10. Now come to some of the applications of the electronic nose.
E-nose can analyze the freshness of a product like food materials and
beverages.
It can also be used for environment monitoring.
Most importantly it can be used in artificial robotics, if it can smell it can be
used in movable robots.
Also it is used in bomb detectors and rescue robots. And the list continues…..

11. With this i conclude my presentation. Thank u.