electronic nose presentation

1. Submitted To :
Submitted By :
Mr. Manish Kumar
Pankaj Beniwal
Professor
11083004
Deptt of food tech
B.Tech (6 sem)
G.J.US&T
G.J.US&T
Hisar
Hisar

2. OUTLINE
Introduction
What is it ?
Comparison
Need of E nose
Working
Principle
Applications
Conclusion
Future prospects
Reference
Queries

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

4. What is it ?
Electronic Nose-
A device intended to detect odors or flavors.
Consist of :-
 an array of electronic sensors used for
chemical detection
 a neural network mechanism used for
pattern recognition

5. Biological Nose E-Nose
Inhaling Pump
Mucus Filter
Olfactory epithelium Sensors
Binding with proteins Interaction
Enzymatic proteins Reaction
Cell membrane depolarized Signal
Nerve impulses Circuitry and neural network
Comparison of e-nose with
biological nose
o Each and every part of the electronic nose is similar
to human nose.
o Comparison Table:

7. The need of an e-nose
o The human sniffers are costly when compared to electronic nose.
o Speedy, reliable new technology of the gas sensors are used in the
electronic nose.
o Detection of hazardous or poisonous gas is not possible with a human
sniffer.
o An e-nose also overcomes other problems associated with the human
olfactory system.
o For the confirmation of the values obtained from a sniffer the result
obtained from the sniffer has to be compared with some other sniffer’s
value.
o There lies a great chances of difference in the values got by each
individual.

8. WORKING OF E-NOSE
o An air sample is pulled by a vacuum pump.
o It is led through a tube into a small chamber consisting of electronic
sensor array.
o A transient response is produced as the volatile organic compounds in the
sample interact with the surface of the sensor’s active material.
o A steady state response is reached within few minutes.
o This response is then sent to a signal processing unit.

9. o A washing gas such as an alcohol vapour is applied to the array for a few
seconds to a minute.
o This is done to remove the odorant mixture from the surface and bulk of
the sensor's active material.
o Finally, the reference gas is again applied to the array, to prepare it for a
new measurement cycle.
o A variety of basic sensors can be used according to the nose strategy
chosen.
o Each sensor in the array has different characteristics.
o The pattern of response across all the sensors in the array is used to identify
and/or characterize the odour.
Contd..

10.  Working principle of an e-nose
Electronic noses include three major parts:
I. a sample delivery system
II. a detection system
III. a computing system
I. Sample delivery system
o Enables the generation of the
headspace (volatile compounds)
of a sample.
o The system then injects this
headspace into the detection
system of the e-nose.

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

12. Applications of E-nose
The applications(current) of an electronic nose
include:
 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

13. In Food Industry
1. Dairy Applications
2. Meat and Poultry Applications
3. Fruit and Vegetable Applications
4. Grains and Beans Applications
5. Beverage Applications

14. Grains and Beans
 CPS (chemical parameter spectrometry) – contains 4
amperometric sensors.
 Odor of classes of good ,moldy , weakly oats was predicted
 classify grains contaminated with alfatoxins.
Working :
 Sample of dilute vapor is pyrolysed on heated
catalyst of platinum.
 Then passed through 4 amperometric sensors of diff
selectivity.
 Each sample was measured with 4 sensors at 4 diff temp
generating 16 signals.
 Signals are finally treated with ANN (artificial neural network)

15. Beverage :
 Beer : Aroma scan A20S with 20 CP is used
 Spanish wine makers monitored lot-to lot variation in
ingredients and detected microbial contamination early using
e-nose
Dairy :
 Enose 4048 system with 12 CP and Aroma scan A20S with
20 CP are used.
 Sensors arrays have been used to determine the role
of fatty acid in aroma profiles of swiss cheese.

16. Conclusion
 An “electronic nose” is a system originally created to mimic the function of an
animal nose.
 Offers a cheap and non destructive instrument that (if properly programmed and
automated) can be operated by non specialists.
 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.
 However, this analytical instrument is more a “multi-sensor array technology”
than a real “nose”.
 Whatever the sensor technology, it is still far from the sensitivity and selectivity
of a mammalian nose.
 Therefore, its aim is not to totally replace either the human nose or other
analytical methods.

17. o in field of crime prevention and
security
o detection of harmful bacteria
o detection of drug odours etc.
The possible and future applications of an electronic nose
include:

18. REFERENCES
 FLGEN KOREL .& MURAT BALABAN -Uses of
electronic nose in food industry.
 Elizabeth A. Baldwin . Jinhe Bai -Electronic
tongue and nose : application for food and
pharmaceutical industry.
 Juan , E.Susana- quality control through
electronic nose sysytem.
 Rod goodman- The Electronic nose – from chips
to robot
 http://www.sensorsportal.com/HTML/DIGEST/au
gust_09/P_470.pdf

19. Any Queries
???

20. Thank You