Electronic Mohibbul
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Transcript of Electronic Mohibbul
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AA
PresentationPresentationonon
ELECTRONIC NOSEBy:-
Md. Mohibbul HaqueB.Tech (EEE)
7080710249
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IntroductionAn 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 todevelop technologies, commonly referred to as
electronic nose that could detect and recognise odors
and flavours.
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Electronic noseElectronic nose
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Contents E-sensing
Techniques to analyze odors.
Working Principle ofElectronic Nose.
How to perform an analysis.
A range of applications.
References.
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What is e-sensing ?Electronic Sensing refers to the capability of
reproducing human senses using sensor arrays and
pattern recognition systems.
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The three major parts of electronic nose
A sample delivery system.
A detection system.
A computing system.
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SAMPLE DELIVERYSAMPLE DELIVERY
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The detection system
The detection system, which consists of a sen sor
set, is the reactive part of the instrume nt.
When in contact with volatile compounds, the
sensors react, which means they experie nce achange of electrical properties.
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INFORMATIONDETECTINGSYSTEMINFORMATIONDETECTINGSYSTEM
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The computing system
The computing system works to combine the
responses of all the sensors which represent the
input for the data treatment.
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COMPUTINGSYSTEMCOMPUTINGSYSTEM
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The sensors
The most commonly used sensors are:-
MOS (Metal Oxide Semiconductors).
CP (Conducting Polymers).
MOSFET ( Metal Oxide Semiconductor Field
Effect Transistor).
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MosMos
A metal oxide semiconductor structure isA metal oxide semiconductor structure is
obtained by depositing a layer of silicon dioxideobtained by depositing a layer of silicon dioxide
(SiO(SiO22) and a layer of metal on top of a) and a layer of metal on top of a
semiconductor die. As the silicon dioxide is asemiconductor die. As the silicon dioxide is a
dielectric material its structure is equivalent to adielectric material its structure is equivalent to a
planar capacitor, with one of the electrodeplanar capacitor, with one of the electrode
replace by a semiconductor.replace by a semiconductor.
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MOSMOS
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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.
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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 recog nize
new samples by comparing volatile co
mpounds fingerprint to those contained in
its database, performing qualitative or quan
titative analysis.
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In Research and Development laboratories:-
In the R & D 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..
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In QualityControl 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..
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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.
3. Cleaning in place monitoring.
and so on..
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THANKSTHANKS