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Electronic Nose: A Review

Poonam B Bhandare, Nilesh S Pendbhaje, and Amit P Narang

The electronic nose was developed in order to mimic human olfaction that functions as a non-separative mechanism: i.e. an odor / flavor is perceived as a global fingerprint. In all industries, odor assessment is usually performed by human sensory analysis, by chemosensors, or by gas chromatography. Over the last decade, "electronic sensing" or "e-sensing" technologies have undergone important developments from a technical and commercial point of view. The "electronic nose" is a relatively new tool that may be used for safety, quality, or process monitoring, accomplishing in a few minutes procedures that may presently require days to complete. Electronic Nose is a smart instrument that is designed to detect and discriminate among complex odours using an array of sensors developed. This specialized field was born and became prominent in the mid 1980s, a smart instrument designed to detect and distinguish complex odours. Typical E-nose device includes, a sampling system, an array of chemical gas sensors, a analog to digital converter (ADC), a computer microprocessor with sample classification method (pattern-classification algorithm). E-nose finds application in industrial processes, environmental toxins and pollutants, space stations & space shuttle air quality, medicines body function, food processing, military environment and toxicology. Electronic noses have provided a plethora of benefits to a variety of commercial industries, including the agricultural, biomedical, cosmetics, environmental, food, manufacturing, military, pharmaceutical, regulatory, and various scientific research fields