Wireless SAW based high-temperature measurement systems

Author

Fachberger, R. ; Bruckner, G. ; Hauser, R. ; Reindl, L.

Author_Institution

Carinthian Tech Res. AG, Villach

fYear

2006

fDate

38869

Firstpage

358

Lastpage

367

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

Keywords

assembling; dipole antennas; gallium compounds; lanthanum compounds; lithium compounds; metallisation; microstrip antennas; packaging; piezoelectric materials; slot antennas; surface acoustic wave delay lines; surface acoustic wave sensors; temperature measurement; temperature sensors; transponders; 2.45 GHz; GaPO₄; ISM band; La₃Ga₅SiO₁₄; LiNbO₃; SAW temperature sensor system; assembly; dipole antenna; frequency modulated radar; gallium-orthophosphate; high temperature stable transponders; high-temperature measurement systems; langasite; lithium niobate; metallization; packaging; passive sensor operation; patch antenna; peak detection algorithm; phase matching algorithm; piezoelectrica; reflective SAW delay lines; sensor geometry; slot antenna; substrate crystals; wireless data transmission; wireless surface acoustic wave temperature measurement system; Acoustic measurements; Acoustic waves; Data communication; Dipole antennas; Slot antennas; Surface acoustic wave devices; Surface acoustic waves; Temperature measurement; Temperature sensors; Wireless sensor networks; SAW; gallium-orthophosphate; langasite; lithium niobate; sensor; temperature; wireless;

fLanguage

English

Publisher

ieee

Conference_Titel

International Frequency Control Symposium and Exposition, 2006 IEEE

Conference_Location

Miami, FL

Print_ISBN

1-4244-0074-0

Electronic_ISBN

1-4244-0074-0

Type

conf

DOI

10.1109/FREQ.2006.275412

Filename

4053790