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Electronic nose
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Transcript

  • 1. Good afternoon
  • 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. 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. What is e-sensing ? Electronic Sensing” refers to the capability of reproducing human senses using sensor arrays and pattern recognition systems.
  • 5. The three major parts of electronic nose I. A sample delivery system. II. A detection system III. A computing system.
  • 6. 1.Sample delivery system  Enables generation of a sample which is to be analyze.  Then it is injected to detection system.
  • 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. 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. DEVELOPMENT OF E - NOSE  The First Generation E-Nose  Second Generation ENose  Third Generation ENose
  • 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. 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. 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. Example of Electronic Nose
  • 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
  • 15. APPLICATIONS
  • 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. 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. 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. 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.  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. 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.  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. 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. 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. THANK YOU