Electronic nose

An electronic nose is used for sensing and pattern recognition. It comprises of an array of chemical-sensing elements and a pattern recognition system. We keep a chemical sample in a sampling box. Sampling box is attached to a sensor array and mixing fan. Mixing fan is utilized to blow the volatile compounds produced over the sensor array. The sensors act quickly and respond to the odorant molecules through a chemical reduction process. This chemical reaction will produce changes in the resistance of the sensor. The electric signal generated from the sensor is sent to an analog to digital converter. The collected data should be normalized by a specific tool called Z-score normalization. This is a specially designed tool where mean and the standard deviation is computed from the training set.