Electronic noses or e-noses are less a sensor or instrument and more a measurement strategy.
Electronic noses have become popular and combine advanced sensors and sensor array strategies with
chemometrics techniques to produce a broad range of intermediate instruments and analyzers. Early e-
noses tried to duplicate the behaviour and capability of human odour sensing. They combined
different sensor types to represent the different cell tissues in the nasal cavity and they took the
approach of detecting an odour as a collection of individual chemicals. The name “odour sensor” is
used instead of “gas sensor” whenever its sensitivity approaches that of a human.