Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Electronic nose


Published on

Published in: Education, Technology, Business
  • Be the first to comment

Electronic nose

  1. 1. Good afternoon
  2. 2. 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.
  3. 3. 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.
  4. 4. What is e-sensing ? Electronic Sensing” refers to the capability of reproducing human senses using sensor arrays and pattern recognition systems.
  5. 5. The three major parts of electronic nose I. A sample delivery system. II. A detection system III. A computing system.
  6. 6. 1.Sample delivery system  Enables generation of a sample which is to be analyze.  Then it is injected to detection system.
  7. 7. 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
  8. 8. 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.
  9. 9. DEVELOPMENT OF E - NOSE  The First Generation E-Nose  Second Generation ENose  Third Generation ENose
  10. 10. 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.
  11. 11. 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
  12. 12. 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.
  13. 13. Example of Electronic Nose
  14. 14. 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. 16. 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
  17. 17. 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
  18. 18. 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.
  19. 19. 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.
  20. 20.  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.
  21. 21. 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.
  22. 22.  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
  23. 23. 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.
  24. 24. 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. 
  25. 25. THANK YOU