This document presents information on electronic noses. It discusses that electronic noses are devices that detect odors and flavors using sensor arrays and pattern recognition systems, similarly to how humans sense smells. The three main parts of an electronic nose are a sample delivery system to introduce headspaces, a sensor detection system of sensors like MOS that react to volatile compounds, and a computing system to analyze the sensor responses. Electronic noses are used in various applications like research and development, quality control, and production to analyze samples and odors.

1. A
Presentation
on
ELECTRONIC NOSE
By:-
Naveen Sihag
B.Tech

2. Introduction
An electronic nose is a device intended to detect
odors or flavours.
Over the last decades, “electronic sensing” or “e-
sensing” technologies have undergone important
development from a technical and commercial point of
view.
Since 1992, researches have been conducted to
develop technologies, commonly referred to as
electronic nose that could detect and recognise odors
and flavours.

3. Electronic nose

4. Contents
 E-sensing
 Techniques to analyze odors.
 Working Principle of Electronic Nose.
 How to perform an analysis.
 A range of applications.
 References.

5. What is e-sensing ?
“Electronic Sensing” refers to the capability of
reproducing human senses using sensor arrays and
pattern recognition systems.

6. Techniques to analyze odors
In industry, aroma assessment is usually
performed by gas chromatography. The
technique gives information about volatile
organic compounds but the correlation between
analytical results and actual odor perception is
not direct due to potential interactions between
several odorous components.

7. The three major parts of electronic nose
A sample delivery system.
 A detection system.
 A computing system.

8. A sample delivery system
The sample delivery system enables the
generation of the headspace (volatile
compounds) of a sample, which is the fraction
analyzed. The system then injects this
headspace into the detection system of the
electronic nose.
The sample delivery system is essential to
guarantee constant operating conditions.

9. SAMPLE DELIVERY

10. The detection system
The detection system, which consists of a sensor
set, is the “reactive” part of the instrument.
When in contact with volatile compounds, the
sensors react, which means they experience a
change of electrical properties.

11. INFORMATION DETECTING SYSTEM

12. The computing system
The computing system works to combine the
responses of all the sensors which represent the
input for the data treatment.

13. COMPUTING SYSTEM

14. The sensors
The most commonly used sensors are:-
• MOS (Metal Oxide Semiconductors).
• CP (Conducting Polymers).
• MOSFET ( Metal Oxide Semiconductor Field
Effect Transistor).

15. Mos
A metal oxide semiconductor structure is
obtained by depositing a layer of silicon dioxide
(SiO2) and a layer of metal on top of a
semiconductor die. As the silicon dioxide is a
dielectric material its structure is equivalent to a
planar capacitor, with one of the electrode
replace by a semiconductor.

16. MOS

17. What is “MOSFET” ?
It stand for metal oxide semiconductor field-effect
transistor. It is an important semiconductor device and is
widely employed in many circuit application.

18. How to perform an analysis
An electronic nose needs to be trained with
qualified samples so as to build a database
of reference. Then the instrument can recognize
new samples by comparing volatile compounds
fingerprint to those contained in its database,
performing qualitative or quantitative analysis.

19. The applications
The electronic nose instruments are used:-
1. In Research and Development laboratories.
2. In Quality Control laboratories.
3. Process and Production department.

20. In Research and Development laboratories:-
In the research & development laboratories,
the electronic nose are used for:-
1. The formulation or reformulation of products.
2. Self life and stability studies.
3. Selection of raw materials.
4. Packaging interaction effects.
and so on..

21. In Quality Control labs.
In quality control laboratories, electronic nose
are used for :-
1. Conformity of raw materials, intermediate and
final products.
2. Batch to batch consistency.
3. Detection of contamination, spoilage,
adulteration.
4. Monitoring of storage conditions.
and so on..

22. In Process and Production department
In process and production department,
electronic nose is used for :-
1. Managing raw material variability.
2. Comparison with a reference product.
and so on..

23. THANKS