Title :
State of the art in wireless sensing with surface acoustic waves
Author :
Bulst, Wolf-Eckhart ; Fischerauer, Gerhard ; Reindl, Leonhard
Author_Institution :
Corp. Technol., Siemens AG, Munich, Germany
fDate :
4/1/2001 12:00:00 AM
Abstract :
Surface acoustic wave (SAW) passive devices can be used in novel applications such as wireless identification and sensing. For identification purposes, a SAW transponder picks up an electromagnetic request signal and stores it until all echoes caused by multipath propagation have died away. Then, a characteristic response is beamed back to the receiver. In radio-link sensors, a physical or chemical quantity influences the propagation properties of the SAW and consequently changes the response pattern of the device. This paper surveys the operating principle of such sensors and their state-of-the-art performance. Examples include temperature sensors and sensors for mechatronic applications
Keywords :
radio applications; surface acoustic wave sensors; temperature sensors; transponders; ID tag; SAW transponder; chemical quantity; electromagnetic request signal; harsh environment; identification purposes; mechatronic application sensors; multipath propagation echoes; operating principle; physical quantity; radio-link sensors; receiver; response pattern; state-of-the-art performance; surface acoustic wave passive devices; surface acoustic waves; temperature sensors; wireless identification; wireless sensing; Acoustic waves; Chemical sensors; Electromagnetic propagation; Sensor phenomena and characterization; Signal processing; Surface acoustic wave devices; Surface acoustic waves; Temperature sensors; Transponders; Wireless sensor networks;
Journal_Title :
Industrial Electronics, IEEE Transactions on
