Sensor Used in E-nose - The Electronic Nose Artificial Olfaction Technology - page 173

Fig. 6.23 a Smart sensor system (schematic block), b basic elements of smart sensor

Sankaran et al. [ 27 ] reviewed other advanced techniques and instruments for
detecting plant diseases, which might be used in combination with E-noses for
disease diagnoses.

6.12.1 Sensory Array

Sensor arrays contain a plurality of discrete sensor elements each of which provides
information about single- or multi-modal stimuli. The array composition and
structure can be extensive in quantity and dimension. In biomedical applications,
several medical diagnostic techniques also take advantage of sensor arrays. The
system is more flexible in use compared to the individual parts and thereby appro-
priate for more applications. Artificial electronic tongues and noses have generally
employed arrays of sensors. In such systems, arrays of microcantilevers are used to
detect the presence of specific substances based on (electro-) chemical reactions,
which can be used for automatic classification and recognition [ 19 ]. High dis-
crimination in array sensors can be easily achieved using conducting polymer
materials due to the wide range of polymeric materials available on the market.