07-07-2012, 10:29 AM
ELECTRONIC NOSE
A ELECTRONIC NOSE.ppt (Size: 714.5 KB / Downloads: 91)
INTRODUCTION
Using Electronic-nose we can sense a smell and with a technology called Digital scent technology it is possible to sense, transmit and receive smell through internet.
There is complete software and hardware solution for scenting digital media and user.
How does the nose work and what is it function?
At first the odor molecules reach the olfactory mucosa.
The receptors for the molecules are placed at the olfactory hairs. When the molecules reach the receptors, an electric impulse is sent directly to the olfactory bulb of brain. Then the information gets to the olfactory glomeruli.
The olfactory bulb will send the impulse to the olfactory brain.
Those scent impulses reach the area of our brain that handles emotions and memories.
This explains the link between smelling and being reminded of something.
ELECTRONIC NOSE
Basic principle of E-nose: An electronic nose can be a modular system comprising of active materials which operate serially on an odorant sample.
These active materials can be classified into two: an array of gas sensors and a signal processing system.
SENSING AN ODORANT
An air sample is pulled by a vacuum pump through a tube into a small chamber housing the electronic sensor array.
Next the sampling handling units exposes the sensors to the odorant, producing a transient response as the VOCs interact with the surface and bulk of sensor’s active material.
A steady state condition is reached in a few seconds to a few minutes.During this interval, the sensor’s response is recorded and delivered to the signal processing unit.
The sensor’s response is converted into electronic signal by using a transducer and is processed by using the signal processing unit.
Polymer sensors
The working of polymer sensors is based on the change in conductivity of the polymer when the odorant is applied. Response time is inversely proportional to polymers thickness.
The main drawback of this method is that it is difficult and time consuming to electro polymerize the active materialo the polymers thickness.
A ELECTRONIC NOSE.ppt (Size: 714.5 KB / Downloads: 91)
INTRODUCTION
Using Electronic-nose we can sense a smell and with a technology called Digital scent technology it is possible to sense, transmit and receive smell through internet.
There is complete software and hardware solution for scenting digital media and user.
How does the nose work and what is it function?
At first the odor molecules reach the olfactory mucosa.
The receptors for the molecules are placed at the olfactory hairs. When the molecules reach the receptors, an electric impulse is sent directly to the olfactory bulb of brain. Then the information gets to the olfactory glomeruli.
The olfactory bulb will send the impulse to the olfactory brain.
Those scent impulses reach the area of our brain that handles emotions and memories.
This explains the link between smelling and being reminded of something.
ELECTRONIC NOSE
Basic principle of E-nose: An electronic nose can be a modular system comprising of active materials which operate serially on an odorant sample.
These active materials can be classified into two: an array of gas sensors and a signal processing system.
SENSING AN ODORANT
An air sample is pulled by a vacuum pump through a tube into a small chamber housing the electronic sensor array.
Next the sampling handling units exposes the sensors to the odorant, producing a transient response as the VOCs interact with the surface and bulk of sensor’s active material.
A steady state condition is reached in a few seconds to a few minutes.During this interval, the sensor’s response is recorded and delivered to the signal processing unit.
The sensor’s response is converted into electronic signal by using a transducer and is processed by using the signal processing unit.
Polymer sensors
The working of polymer sensors is based on the change in conductivity of the polymer when the odorant is applied. Response time is inversely proportional to polymers thickness.
The main drawback of this method is that it is difficult and time consuming to electro polymerize the active materialo the polymers thickness.