English: General structure of a surface acoustic wave sensor with connections to an AC voltage source and a signal processing unit. In some sensors, the acoustic absorbers are replaced with reflectors to decrease insertion loss. A wireless surface acoustic wave sensor can be made by replacing the output IDT and coupling the input IDT to an radio-frequency (RF) antenna rather than a voltage source.
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{{Information |Description ={{en|1=General structure of a surface acoustic wave sensor with connections to an AC voltage source and a signal processing unit. In some sensors, the acoustic absorbers are replaced with reflectors to decrease insertion lo