electronic nose

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electronic nose

  1. 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. 2. OUTLINE Introduction What is it ? Comparison Need of E nose Working Principle Applications Conclusion Future prospects Reference Queries
  3. 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. 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. 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:
  6. 6. 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.
  7. 7. 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.
  8. 8. 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..
  9. 9.  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.
  10. 10. 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.
  11. 11. 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
  12. 12. In Food Industry 1. Dairy Applications 2. Meat and Poultry Applications 3. Fruit and Vegetable Applications 4. Grains and Beans Applications 5. Beverage Applications
  13. 13. 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)
  14. 14. 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.
  15. 15. 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.
  16. 16. 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:
  17. 17. 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
  18. 18. Any Queries ???
  19. 19. Thank You

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