electronic nose by yash pani

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ELECTRONIC NOSE

• By- SHWETA SINGH
• EN-F
• 0902721093

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CONTENTS

• What is an E-Nose
• Analogy between an E-Nose a Biological Nose
• How does an E-Nose work
• Basic Design of an E- Nose
• How does a Sensor work
• Why is E-Nose better
• Current and Future Applications

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WHAT IS AN ELECTRONIC-NOSE

• An Electronic Nose is a system that uses pattern
  of responses from an array of gas sensors to
  examine and identify a gaseous sample.

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OUR ELECTRONIC NOSE
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ANALOGY BETWEEN AN E-NOSE A BIOLOGICAL NOSE

• InhalinggtPump
  
• MucusgtFilter
• Olfactory EpitheliumgtSensors
• Enzymatic ReactionsgtReaction
• Binding With ProteinsgtInteraction
• Cell Membrane DepolarizedgtSignal
• Nerve ImpulsesgtCircuitry Neural Network

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HOW DOES A BIO NOSE WORK
A ROSE
MUCUS FILTER
RECEPTOR PROTEIN SENSOR
CIRCUIRY NN
NERVE
WOULD A ROSE SMELLED BY ANY OTHER NOSE SMELL AS
SWEET
INPUT
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BASIC DESIGN OF E-NOSE
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WORKING PRINCIPLE

• Developed to mimic human olfaction which is a
  crucial mechanism
• Essentially the instrument contains-
• Head space Sampling
• Sensor array
• Pattern recognition module

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• E-Nose includes three major parts-
• A Sample Delivery System
• A Detection System
• A Computing System
• Sample Delivery System
• Enables generation of volatile compounds
• Then injects this headspace into detection system

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• Detection System
• Consists of a sensor set
• Sensors when contacted with volatile compounds
  develop change in electrical properties
• This response is recorded by electronic interface
  transforming signal to digital value.
• Types of Sensors
• Metal oxide semiconductor
• Conducting Polymers
• Surface Acoustic Wave
• Quartz Crystal Microbalance

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• Computing System-
• Works to combine responses of all sensors
• it performs global fingerprint analysis and
  provides results and representations that can be
  easily interpreted.

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BLOCK DIAGRAM REPRESENTATION
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• 1. An auto sampler
• It consists of a sample carousel where the
  vials containing the odour-emitting sample are
  held an oven where the sample is
  pre-conditioned a movable mechanic arm with
  syringe (A).
•  

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• The electro-mechanical part of the EN used in
  this experiment consists of -
• 2. A mass flow controller (B)- to set the flow
  of the carrier gas.
• 3. A stained steel chamber (C) -which can contain
  up to five chemical sensors plus a humidity
  sensor.
• 4. Control electronics (D) -permitting to steer
  the system (auto sampler mass flow controllers
  and sensors) via PC.
•  

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• The typical measurement consists of the exposure
  of the sensors to a concentration step that is a
  change of odour concentration from zero to c
  (each component of the vector stands for a gas
  component) and back to zero again and of the
  recording of the subsequent change in resistance.
  The classical feature extracted from the response
  curve is the relative change in resistance.

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HOW DOES AS GENERAL SENSOR WORK

• Functioning is according to the change in
  resistance.
• Sensor absorbs gas emitted from sample
• It results in change in resistance of sensor
• By relation VIR Voltage drop across also
  changes
• This voltage is measured and is given to the
  circuit for further processes.

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An E-Nose Sensor
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WHY IS E-NOSE BETTER

• Trained human sniffers are expensive
• Individuals vary
• Hazardous Chemicals
• Can be done in real time for long periods

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WHERE ELECTRONIC NOSES ARE USED

• Automotive
• Food Safety
• Telemedicine
• Emergency Response
• Military and Space
• Environmental Monitoring

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APPLICATIONS

• In quality control laboratories for at line
  quality control such as
• Conformity of raw materials intermediate and
  final products
• Batch to batch consistency
• Detection of contamination spoilage
  adulteration
• Origin or vendor selection
• Monitoring of storage conditions.

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• In process and production departments
• Managing raw material variability
• Comparison with a reference product
• Measurement and comparison of the effects of
  manufacturing process on products
• Following-up cleaning in place process efficiency
• Scale-up monitoring
• Cleaning in place monitoring.

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• Possible and future applications in the
  fields of health and security
• Detection of dangerous bacteria
• Detection of Lung Cancer
• Quality Control of Food Products
• Nasal implants can warn presence of natural gas

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• Possible and future applications in the field
  of crime prevention and security-
• Detection of Drug Odors
• Bomb detection
• Applications in Environmental Monitoring
• For identification of volatile organic compounds
  in air water and soil samples.
• For environmental protection.

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THANK YOU
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