Introduction

   The electronic nose is a device that detects the smell more effectively than the human sense of smell, using a mechanism of chemical detection. It is an intelligent sensing device that uses an array of gas sensors which are overlapping selectively along with a pattern reorganization component. Of late this revolutionary technology has provided extensive benefits to a variety of commercial industries, agriculture, biomedical, cosmetics, environmental, food, water and various scientific research fields. The electronic nose detects the hazardous or poisonous gas which are beyond the range of human sniffers.

   The smell of different materials are composed of molecules which have a specific size and shape. Each of these molecules has a corresponding sized and shaped receptor in the human nose. When a specific receptor receives a molecule it sends a signal to the brain and brain identifies the smell associated with the particular....