1. Good afternoon

3. contents








Introduction
What is e–sensing?
Major parts of e- nose
Analogy between e-nose and human nose
Development of e-nose
Example of e-nose
Applications.
Conclusion.

4. INTRODUCTION

Electronic noses are engineered to mimic
the mammalian olfactory system.
 It is an array of non-specific chemical
sensors,
controlled
and
analysed
electronically.
 The sensors used here are conduct metric
chemical sensors which change resistance
when exposed to vapours.
 Gases and gas mixtures can be identified
by the pattern of response of the array.

5. What is e-sensing ?
Electronic Sensing” refers to the capability of
reproducing human senses using sensor arrays and
pattern recognition systems.

6. The three major parts of
electronic nose
I. A sample delivery system.
II. A detection system
III. A computing system.

7. 1.Sample delivery system
 Enables generation of a
sample which is to be
analyze.
 Then it is injected to
detection system.

8. 2.The detection system
 Contains a group of sensors to sense the
compound
 Sensors react to the compound and the response
is recorded by an electronic interface.
 Transforms signal into digital value

9. 3.The computing system

It combines the responses of all sensors to
produce a result.
 These results can be easily analyzed with
a database of qualified samples.
 New samples are identified by comparing
those with the samples in database.

10. DEVELOPMENT OF E - NOSE
 The
First Generation
E-Nose
 Second Generation ENose
 Third Generation ENose

11. FIRST GENERATION E
NOSE



The first generation of e-nose
were based on Sensor Arrays
(with different types of
sensors).
The 1st generation E Nose
Sensor Unit flight
experiment, which flew aboard
the STS-95 (1998), used an
HP-200LX Palmtop Computer
for device control and data
acquisition;
data were collected and
analyzed after landing.

12. SECOND GENERATION E
NOSE


The second-generation E
Nose has the same
functions as the firstgeneration device, but has
been miniaturized to occupy
less than 1000 cm3 with a
mass ~800 g, not including
the operating computer.
The sensors are films of
polymers which have been
loaded with carbon to make
them conductive

13. THIRD GENERATION E NOSE


It includes an ISS interface
unit, which conforms to
electrical, data
telemetry, display and data
storage requirements for ISS.
The E Nose Sensor Unit
consists of an anodized
aluminium chassis which
houses the Sensor array and
pneumatic system.

14. Example of Electronic Nose

15. contd..
 The Cyranose 320 is a handheld “electronic nose”
developed by Cyrano Sciences of
Pasadena, California in 2000.
 The Cyranose 320 is based on sensor research
performed by Professor Nathan Lewis of the
California Institute of Technology.
 Applications researched using the Cyranose 320
include the detection of COPD, and other medical
conditions as well as industrial applications
generally related to quality control

16. APPLICATIONS

17. 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

18. The possible and future applications of
an electronic nose include:
 Detection of drug odors etc.
 In field of crime prevention and security
 Detection of harmful bacteria

19. Medical diagnosis and health
monitoring by e-nose
I. Respiratory disease diagnosis Human breath contains thousands of volatile organic
compounds (VOCs) in gas phase.
 E-nose can diagnose respiratory infections such as
pneumonia.
 It does so by comparing smell prints from the breath of a
sick patient with those of patients with standardized
readings.
 It is also being studied as a diagnostic tool for lung
cancer.

20. II. Cancer detection E-nose is capable of distinguishing
between the breath of a healthy
person and a person with cancer.
 The device is especially promising
because it is able to detect cancer
before tumors become visible in Xrays.

21.  Environmental applications of
electronic noses include:

analysis of fuel mixtures
 detection of oil leaks
 testing ground water for odours
 identification of household odours
 identification of toxic wastes
 air quality monitoring
 monitoring factory emissions etc.

22. Applications of e-nose in food industry
Analysis of fruit ripening Fruit ripening is associated with an
accumulation of aromatic volatiles
during ripening.

Information from the noses can help in
removal of rotten fruits at the
appropriate time.
 This can help in avoiding storage losses
due to rots and fruit diseases.

23.  In the field crime prevention
 E-nose is being developed for military and security
applications in the detection of explosives and
hazardous chemicals.
 to detect drug odours despite other airborne odours
capable of confusing police dogs

24. Space applications---e-nose and
NASA

It is a full-time, continuously
operating event monitor used in the
International Space Station.
 Designed to detect air contamination
from spills and leaks in the crew
habitat
 Provides rapid, early identification
and quantification of atmospheric
changes caused by chemical species
to which it has been trained.

25. 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.


26. THANK YOU