Abstract
This paper introduces briefly the structures, specifications and applications of surface acoustic wave (SAW) sensors, as well as the progresses in the related studies. The SAW sensors include Rayleigh wave, shear horizontal acoustic plate wave, Love wave and Lamb wave sensors. The application fields are classified according to the functions into physical sensors and chemical/biological sensors; the former can be performed more easily, but the latter homes special functions and so needs to be studied in more details based on the practical conditions. The SAW sensors have very high sensitivity and wide applications due to the velocities and phase of SAW are sensitive to the parameter changes of environments.
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