Title :
Enhancement of SAW multi-sensor systems using a combination of time and frequency diversity techniques
Author :
Tucker, D.Y.G. ; Solie, L.P. ; Hines, J.H.
Author_Institution :
Appl. Sensor R&D Corp., Arnold, MD, USA
Abstract :
Passive wireless sensors such as surface acoustic wave (SAW) devices are advantageous for applications such as heavy equipment monitoring and process control where harsh environments, moving parts, or limited battery lifetime preclude the use of wired or battery powered wireless sensors. In this work, Barker coded SAW delay lines with desirable autocorrelation properties were developed using time and frequency diversity to enhance the number of devices that may be accessed simultaneously. SAW device responses were modeled in MatLab and response correlations were simulated. Design parameters were selected to allow 100 sensors to be simultaneously operable in a single wireless system, and simulated and experimental results are presented. Results indicate that the combination of time diversity and frequency diversity techniques can significantly increase the number of individually identifiable passive sensors achievable over currently available systems.
Keywords :
diversity reception; sensor fusion; surface acoustic wave correlation; surface acoustic wave delay lines; surface acoustic wave sensors; Barker coded SAW delay line; Matlab; SAW multisensor system; autocorrelation property; frequency diversity technique; passive wireless sensor; response correlation; surface acoustic wave; time diversity technique; Bandwidth; Correlation; Delay; Frequency diversity; Surface acoustic waves; Wireless communication; Wireless sensor networks;
Conference_Titel :
Frequency Control Symposium (FCS), 2012 IEEE International
Conference_Location :
Baltimore, MD
Print_ISBN :
978-1-4577-1821-2
DOI :
10.1109/FCS.2012.6243725
