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Proceedings Paper

Wireless SAW sensors for surface and subsurface sensing applications
Author(s): Andreas Stelzer; Gernot Schimetta; Leonhard Reindl; Andreas Springer; Robert Weigel
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Paper Abstract

Surface acoustic wave (SAW) devices, used as filters or diplexers, are well established components in communications applications like in mobile handsets or television sets. The characteristics of SAW devices make them also well suitable for the application of wireless sensors or wireless identification tags. A great advantage of SAW sensors is their completely passive operation without the need for additional power supplies. SAW sensors can be designed to sense several physical or chemical quantities like temperature, pressure, stress, or gas concentration. During operation of the wireless sensor the energy delivered from an RF pulse sent by an interrogation unit is picked up by the antenna, stored in the surface acoustic wave, modified by the sensor effect and is finally transmitted back to the interrogation unit. In this paper the basic operating principles of SAW devices are reviewed and two applications, a state-of-the-art tire pressure sensor and a moisture sensor, are presented.

Paper Details

Date Published: 27 November 2001
PDF: 9 pages
Proc. SPIE 4491, Subsurface and Surface Sensing Technologies and Applications III, (27 November 2001); doi: 10.1117/12.450181
Show Author Affiliations
Andreas Stelzer, Johannes Kepler Univ. Linz (Austria)
Gernot Schimetta, Johannes Kepler Univ. Linz (Austria)
Leonhard Reindl, Technische Univ. Clausthal (Germany)
Andreas Springer, Johannes Kepler Univ. Linz (Austria)
Robert Weigel, Johannes Kepler Univ. Linz (Germany)

Published in SPIE Proceedings Vol. 4491:
Subsurface and Surface Sensing Technologies and Applications III
Cam Nguyen, Editor(s)

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