Summary
The latest research work on surface acoustic wave wireless sensors is presented. The main advantage of surface acoustic wave sensors is their outstanding thermal stability specially compared to semiconductors. The sensors utilize a piezo-effect that creates so-called surface acoustic waves by means of a transducer structure on the surface of the sensor. Depending on temperature or mechanical strain the surface acoustic waves are affected. These changes on the surface acoustic waves are used for the sensor effect. The sensors can be clearly distinguished when further surface acoustic wave reflectors are introduced. This leads to the application as a high temperature RFID system (radio frequency identification). Industrial applications of the technology are manifold. Examples from steel industry, mechanical engineering and energy supply are briefly discussed.
Zusammenfassung
Es werden aktuelle Forschungsarbeiten von Oberflächenwellen-basierenden Funksensoren vorgestellt, welche insbesondere gegenüber Halbleiter-Transponder eine besonders gute thermische Stabilität von über 300 °C aufweisen. Die Sensoren machen sich einen Piezoeffekt zunutze, indem mittels einer Wandlerstruktur auf der Oberfläche des Sensors so genannte Oberflächenwellen erzeugt werden. Je nach Temperatur oder mechanischer Verspannung werden die Oberflächenwellen beeinflusst. Diese Änderungen der Oberflächenwellen werden für den Sensoreffekt genutzt. Durch Anbringung weiterer Oberflächenwellenreflektoren auf dem Sensor sind die Sensoren eindeutig unterscheidbar. Dies führt zur Anwendung als Hochtemperatur-Identifikationssystem (RFID – radio freqency identification). Industrielle Anwendungen der Technologie sind vielfältig. Beispiele aus der Stahlindustrie, Maschinenbau und Energieversorgung werden kurz vorgestellt.
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Binder, A. Neue Anwendungen von Oberflächenwellen-Funksensoren. Elektrotech. Inftech. 127, 64–69 (2010). https://doi.org/10.1007/s00502-010-0720-7
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DOI: https://doi.org/10.1007/s00502-010-0720-7