Download - t.srilekha ppt 4a4 electronic nose.pptx
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ELECTRONIC NOSE
Under The Guidance OfMrs.T.Kavitha
Presented By M.Sadhana(09A91A0426)
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CONTENTSIntroductionComponentsAnalogy between biological nose and E-
noseWorking mechanism of sensorsApplicationsAdvantagesFuture scopeconclusion
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INTRODUCTION E-nose is developed in early 1980’s by
“Julian Gardner” Electronic nose is smart instrument that
is designed to detect and discriminate among complex odours using an array of sensors.
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COMPONENTSMain components
1.Sensing system2.Patter recognition system
Sub components1.Sample delivery system2.Detection system3.Computing system
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BLOCK DIAGRAM
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ANALOGY BETWEEN BIOLOGICAL NOSE AND E-NOSE
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The human nose uses the lungs to bring the odor to the epithelium layer; the electronic nose has a pump.
The human nose has mucous, hairs, and membranes to act as filters and concentrators ; while the E-nose has an inlet sampling system that provides sample filtration and Conditioning to protect the sensors and enhance selectivity.
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WORKING MECHANISM OF SENSORS
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The sensors in the electronic nose are polymer films which have been loaded with a conductive medium.
A baseline resistance of each film is established; as the constituents in the air change, the films swell or contract in response to the new composition of the air, and the resistance changes.
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APPLICATIONS In detection of bombsFor multimedia ApplicationElectronic nose for medicineIn food industryTo detect skin vapoursIn resources and development laboratories
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ADVANTAGESQuality classification of stored grain.Water and wastewater analysis.Identification of source and quality of
coffee. Monitoring of roasting process.Process control of cheese, sausage, beer,
and bread manufacture.Bacterial growth on foods such as meat,
fish and fresh vegetables.
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FUTURE SCOPE
Research is being done on IC E-NosesMiniaturizing current TechnologyImprovement in sensitivity for lower
levels of organisms or smaller samplesMinimizing cost
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CONCLUSIONNo wonder the electronic nose is
sometimes referred to as a "sniffer". The E-nose has the interesting ability to
address analytical problems that have been refractory to traditional analytical approaches. In my view the electronic nose is a very useful instrument now-a-days.
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THANK YOU