A case-study by
Shirish Bharati BT11MEC073
Shivam Rathod BT11MEC074
Siddhant Goyal BT11MEC075
Sushant Somkuwar BT11MEC076
Measurement and Signal
• History of artificial nose
• Introduction of artificial nose
• Types of artificial nose
• Components of artificial nose
• Experimental setup
• Types of sensors
• Future scope
History of artificial nose
• The concept of artificial nose first appeared in a paper by Persuade
and Dodd (1982).
• The artificial nose was developed on 19th august 2008.
• E-NOSE is a device that identifies the specific components of an odor
& analyses its chemical makeup to identify it.
Components of artificial nose
• Sample Delivery system – It is essential to guarantee constant operating
• Detection systems - It consists of a sensor set and is the "reactive" part of the
instrument. When in contact with volatile compounds, the sensors react.
Commonly used sensors are metal oxide semiconductor (MOSFET), conducting
polymers, quartz crystal micro balance, surface acoustic wave (SAW), etc.
• Computing system - The computing system works to combine the responses of all
of the sensors, which represents the input for the data treatment.
TYPES OF SENSORS
A sensor is a device which can respond to some properties of the
environment and transform the response into an electric signal
Exhibit a property of change when exposed to
PIEZO ELECTRIC SENSORS
A piezoelectric sensor is a device that uses the piezoelectric
effect to measure pressure, acceleration, strain or force by
converting them to an electrical signal, they are configured as
mass-change sensing device.
A) QCM SENSOR:
The QCM sensor consists of a resonating disk a few millimeters in
diameter, with metal electrodes on each side connected to dead wise.
The device resonate at a characteristic frequency (10MHz to
30MHz) when excited with an oscillating signal.
B) SAW Sensor:
• In SAW sensor a Surface
wave travels over the
surface of the device; not
throughout its volume.
• SAW sensors operate at
much higher frequencies,
and so can generate a larger
change in frequency.
MOSFET odour sensing device are based on the principle that VOCs in
contact with a catalytic metal can produce a reaction in the metal and
the reaction’s products can diffuse through the gate of the MOSFET to
change the electrical properties of the device.
• 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
• 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.
• Helpful in identification of Quality classification of stored grain.
• Helpful in identification of Water and wastewater analysis.
• Helpful in identification of source and quality of coffee.
• Helpful in detection and diagnosis of pulmonary infections.
• Helpful in diagnosis of ulcers by breath tests.
• Helpful in identification of freshness of fish.
• Helpful in identification of process control of cheese, beer and bread.
• Cost of artificial nose
• Time delay of artificial nose.
• Improved sensitivity for use with water quality.
• Improvement in the sensitivity of artificial nose for lower level of organism
• Improvement in the sensitivity of artificial nose for identification of infection.
• Development of sensor suitable for artificial nose use.
• For identification of volatile organic compounds in air, water and soil samples.
• It may also be used as a bomb detection method in airports. Through careful
placement of several or more electronic noses and effective computer systems
you could triangulate the location of bombs to within a few metres of their
location in less than a few seconds.
• Nasal implants could warn of the presence of natural gas, for those who
had anosmia or a weak sense of smell.
• The Brain Mapping Foundation used the electronic nose to detect brain cancer
Humans are not well suited for repetitive or boring tasks that are better
left to machines. No wonder the artificial nose is sometimes referred to
as a sniffer. The artificial nose has the interesting ability to address
analytical problems that have been refractory to traditional analytical
In my view the artificial nose is a very useful instrument now a days.