it is about e-nose technology

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Under Guidance Of: PRESENTED BY:
Dr SHAHANAZ AYUB 130433901
(Associate Professor) (Electronics and Comm. Engg.)
Deptt. Of Electronics and Comm. Engg. 3rd Year
BIET JHANSI BIET JHANSI
E-NOSE

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Content
 Introduction
 Definition and explanation
 History
 Need of an e-nose
 Working principle
 Sensor technology in e-nose
 Performing an analysis with an e-nose
 Applications
 Conclusion
 References

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Electronic noses are engineered to mimic the mammalian olfactory system.
Instrument designed to allow repeatable identifications and classifications of aroma
mixtures.
Determines the various characteristics properties of the odour while eliminating operator
fatigue.
Introduction- electronic nose(e-nose)
e-sensing
Refers to the capability of reproducing human senses using sensor arrays and pattern
recognition systems.

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Definition: electronic nose(e-nose)
 Device intended to detect odour or flavors.
 Can be seen as arrays of sensors able to generate
electrical signals in response to either simple or
complex volatile compounds present in the gaseous
sample.

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The first electronic noses were reported by Wilkens and Hatman in 1964
including Redox reactions.
The term electronic nose appeared around 1980s.
IN 1989, At conference of NATO chemo sensory information processing was
detected.
Finally first conference dedicated to e-nose was held in 1990.
History of e-nose

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The human sniffers are costly when compared to electronic nose.
Speedy, reliable new technology of the gas sensors are used in the electronic
nose
Detection of hazardous or poisonous gas is not possible with a human sniffer.
An e-nose also overcomes other problems associated with the human olfactory
system.
Need of an e-nose

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Electronic noses include three major parts:
i. a sample delivery system
ii. a detection system
iii. a computing system
Working Principle
Sample delivery system
 Enables the generation of the headspace (volatile compounds) of a
sample.
 The system then injects this headspace into the detection system of
the e-nose.

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Detection System
Consist of a sensor set, is the "reactive" part of the instrument.
Absorption of volatile compounds on the sensor surface causes a physical change of the
sensor, they experience a change of electrical properties.
A specific response is recorded by the electronic interface transforming the signal into a digital
value.
Recorded data are then computed based on statistical models.
Computing System
Works to combine the responses of all the sensors.

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Metal oxide sensors
Adsorption of gas molecules provoke changes in conductivity.
This conductivity change is the measure of the amount of volatile
organic compounds adsorbed.
Conducting polymers
Conducting or conductive polymer gas sensors operate based on
changes in electrical resistance caused by adsorption of gases on
sensor surface.
Sensor technology in E-nose

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Quartz crystal microbalance
It’s a way of measuring mass per unit area by measuring the change in
frequency.
Can be stored in data base for future references.
Surface acoustic wave
It depends on modulation of surface acoustic wave to sense a
physical phenomenon

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Performing an analysis with an e-nose
 As a first step, an e-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.
 Thus they can perform the analysis.

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Medical diagnosis and health monitoring
Environmental monitoring
Application in food industry
Detection of explosives
Space applications(NASA)
In research and development industries
 In quality control laboratories
In process and production department
APPLICATIONS OF ELECTRONIC NOSE

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An “electronic nose” is a system originally created to copy the function of an animal nose.
Since the whole process is automatic, the cost of each measurement is very low.
Finally, the measurement cycle should be faster in order to increase throughput.
This sensor technology is still far from the sensitivity and selectivity of a real nose.
So it can’t totally replace the nose but can be used for different purposes with better
advancement in technology in future.
Conclusion

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[1] J.W. Gardner, P.N. Bartlett, "A brief history of electronic noses", Sensors and Actuators B, Vol. 18,
1994, pp. 211-220.
[2] Baltes, D. Lange and A. Koll, The electronic nose in Lilliput. IEEE Spectrum35 9 (1998), pp. 35-38.
[3] http://en.wikipedia.org/wiki/electronic nose
[4] I. Lundström, A. Spetz, F. Winquist, U. Ackelid, H. Sundgren, "Catalytic metals and field-effect
devices-a useful combination", Sensors and Actuators B: Chemical, Volume 1, Issues 1-6, January
1990, Pages 15-20.
References

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Thank you