Title :
Spread spectrum techniques for wirelessly interrogable passive SAW sensors
Author :
Pohl, A. ; Ostermayer, G. ; Reindl, L. ; Seifert, F.
Author_Institution :
Appl. Electron. Lab., Univ. of Technol., Vienna, Austria
Abstract :
Recently surface acoustic wave (SAW) sensors for temperature, pressure, strain, etc. were investigated and tested. They use the change in SAW time delay due to the quantity to be measured. Increasing interest was initiated by the possibility of wireless readout. It is shown here, that the well known spread spectrum techniques (chirp impulse compression, CDMA, etc.) allows an increase of both, sensitivity and accuracy of measurement and a discrimination of several sensors interrogated. Some applications (temperature measurement with mK resolution, coded sensors) are demonstrated. We show some mathematical simulations and preliminary experimental results
Keywords :
code division multiple access; electric sensing devices; interdigital transducers; radio applications; spread spectrum communication; surface acoustic wave delay lines; surface acoustic wave sensors; temperature measurement; CDMA; SAW time delay; chirp impulse compression; coded sensors; discrimination; electronic sensors; mK resolution; mathematical simulations; measurement accuracy; sensitivity; spread spectrum techniques; surface acoustic wave sensors; temperature measurement; wireless readout; wirelessly interrogable passive SAW sensors; Acoustic measurements; Acoustic sensors; Acoustic testing; Acoustic waves; Capacitive sensors; Delay effects; Spread spectrum communication; Surface acoustic waves; Temperature sensors; Time measurement;
Conference_Titel :
Spread Spectrum Techniques and Applications Proceedings, 1996., IEEE 4th International Symposium on
Conference_Location :
Mainz
Print_ISBN :
0-7803-3567-8
DOI :
10.1109/ISSSTA.1996.563220
