ELECTRONIC NOSE

Under The Guidance OfMrs.T.Kavitha

Presented By M.Sadhana(09A91A0426)

CONTENTSIntroductionComponentsAnalogy between biological nose and E-

noseWorking mechanism of sensorsApplicationsAdvantagesFuture scopeconclusion

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.

COMPONENTSMain components

1.Sensing system2.Patter recognition system

Sub components1.Sample delivery system2.Detection system3.Computing system

BLOCK DIAGRAM

ANALOGY BETWEEN BIOLOGICAL NOSE AND E-NOSE

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.

WORKING MECHANISM OF SENSORS

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.

APPLICATIONS In detection of bombsFor multimedia ApplicationElectronic nose for medicineIn food industryTo detect skin vapoursIn resources and development laboratories

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.

FUTURE SCOPE

Research is being done on IC E-NosesMiniaturizing current TechnologyImprovement in sensitivity for lower

levels of organisms or smaller samplesMinimizing cost

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.

THANK YOU