Electronic Mohibbul

8/7/2019 Electronic Mohibbul

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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

Electronic Mohibbul

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