PRESENTED BY S.VENKTESWARLU

 Over the last decade, "electronic sensing" or “E-sensing" technologies have undergone important developments from a technical and commercial point of view  The First idea for E- sensing comes on 1914  Since 1982 research has been conducted to develop E-sensing technologies

Different existing gas detection methods such as  Gas chromatography (GC)  Mass spectrometry (MS)  GC-MS Method  Ion mobility spectrometry (IMS) etc

 Human Senses were replaced by E-senses such as  EYE > Camera  Hear------> Microphone  Touch-----> Thermometer  Taste -----> E-Tongue  Smell-----> E-Nose

Human olfactory systems have large numbers of organs in the (10 Millions for humans, 100 Millions dog). There are 1000 different organs (We smell in 1000 different “odor”).

 Works on non seperative mechanism  Each odour has its unique identification as same as finger print  No two odours have same properties  By this we can analyze the flavour

 The major three components of E-nose are 1. Sampling Deliver system 2.Detection System 3.Computing system

 The sample delivery system enables the generation of the volatile compounds  The system then injects this headspace into the detection system of the electronic nose.

 It consists of a sensor set to react  It is the "reactive" part of the instrument  The sensors react when odour detects  which means the sensors experience a change of electrical properties.

 Here MOSFET used to amplify the signals  Change in odour leads to change in sensor electrical property (either positive or negative)  This change directly given to the MOSFET to amplify the signal

 It is used to match the recognised pattern with predefined patterns and give appropriate results

A few applications of E-Nose are  Medical Diagnostics  Food Processing Industries  Explosive Detection  Chemical Research Laboratories  Quality Control Laboratories etc

 Some types of Cancer detection such as lung cancer  Harmful Bacteria detection

 High cost  Low range application area  Complex city in matching odour patterns

 E-Nose is one of the major invention which can capable to sense the human senses  It can help the modern world to solve many problems and save more valuable lives.  This is not a device which completely replace the human sense but most of cases it is possible.