Review of Surface Acoustic Wave Sensors for the Detectionand Identification of Toxic Environmental Gases/Vapours

Detection and identification of toxic environmental gases have assumed paramount importance precisely in the defense, industrial civilian security sector. Numerous methods been developed for sensing environment ever since surface acoustic wave (SAW) technology came into existence. Such SAW sensors called electronic nose (E-Nose) sensor use frequency response a delay line/resonator. device is focused given importance. The selective coating between input output interdigital transducers (IDTs) responsible corresponding changes operating specific gas/vapour absorbed from environment. A suitable combination well-designed lines with coatings not only help to improve sensitivity selectivity but also leads minimization false alarms E-Nose sensor. This article presents comprehensive review design, development, simulation modelling potential gases.