Theory and application of passive SAW radio transponders as sensors
- 1 September 1998
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
- Vol. 45 (5) , 1281-1292
- https://doi.org/10.1109/58.726455
Abstract
Surface acoustic wave (SAW) radio transponders make it possible to read identification codes or measurement values from a remote location. The decisive advantage of these SAW transponders lies in their passive operation (i.e., no power-supply), and in the possibility of wireless installation at particularly inaccessible locations. The passive SAW transponders are maintenance free. Identification marks respond to an interrogation signal with their nonchanging identification pattern. In wireless SAW sensors the physical or chemical properties to be detected change the propagation characteristics of the SAW. SAW radio transponders are advantageously placed on moving or rotating parts and in hazardous environments such as contaminated or high voltage areas. They also can be used for contactless measurements in high vacuum process chambers, under concrete, extreme heat, or strong radioactive radiation, where the use of conventional sensors is complicated, dangerous, or expensive. In this paper we discuss the principles of wireless passive SAW transponders and present a radio frequency interrogation unit and several passive radio SAW sensors developed for noncontact measurements of temperatures, pressures, torques, and currents.Keywords
This publication has 19 references indexed in Scilit:
- CDMA for wireless SAW sensor applicationsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Radio accessible SAW sensors for non-contact measurement of torque and temperaturePublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Quartz pressure sensor based on SAW reflective delay linePublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Wavelet transform with a SAW convolver for sensor applicationPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Remote sensing using quartz sensorsPublished by SPIE-Intl Soc Optical Eng ,1996
- Radio signals for SAW ID tags and sensors in strong electromagnetic interferencePublished by Institute of Electrical and Electronics Engineers (IEEE) ,1994
- Remote sensor system using passive SAW sensorsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,1994
- Model based processing of signals: a state space approachProceedings of the IEEE, 1992
- SAW Temperature Sensor and Remote Reading SystemPublished by Institute of Electrical and Electronics Engineers (IEEE) ,1987
- A Miniature Hybrid Circuit SAW Oscillator Using an All Quartz Packaged ResonatorPublished by Institute of Electrical and Electronics Engineers (IEEE) ,1985