Wireless SAW based high-temperature measurement systems

René Fachberger, G. Bruckner, R. Hauser, Leonhard Reindl

    Research output: Conference proceeding/Chapter in Book/Report/Conference Paper

    Abstract

    The paper exemplifies the development of a surface acoustic wave (SAW) temperature measurement system, showing the advantages of wireless data transmission and passive sensor operation. It includes results of research on lithium niobate, langasite and gallium-orthophosphate, three piezoelectrica used as substrate crystals for the SAW devices. Critical parameters, limits and prospects of the materials as well as technological issues concerning the metallization and the lifetime of reflective SAW delay lines are discussed. The packaging and assembly of high temperature (HT) stable transponders is explained. A slot antenna, a patch antenna and a dipole antenna, thus providing maximum flexibility for the sensor geometry, are investigated. A phase matching algorithm, enhancing the measurement resolution by two orders of magnitude compared to a conventional peak detection algorithm, is described. A fully integrated SAW temperature sensor system is presented, basing on a frequency modulated radar operating in the 2.45 GHz ISM band and designed for a world wide legal usage
    Original languageEnglish
    Title of host publication2006 IEEE International Frequency Control Symposium and Exposition
    Pages358-367
    Number of pages10
    DOIs
    Publication statusPublished - 2006

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