Title :
Wireless multiple access surface acoustic wave coded sensor system
Author :
Dudzik, E. ; Abedi, A. ; Hummels, D. ; da Cunha, M. Pereira
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Maine, Orono, ME
Abstract :
A novel wireless sensor and identification system based on passive surface acoustic wave devices is reported. Quasi-orthogonal codes, which allow for multiple access capability, were implemented using a differential delay line scheme on miniaturised passive sensor units. A transceiver interrogation system combining analogue and digital circuitry has been designed and assembled to investigate the wireless devices´ performance. Experimental results with 31-chip-long codes verified the expected theoretical response of the prototype wireless device to interrogation with the matching coded sequence. The system, which enables concurrent wireless access to multiple passive devices, creates new possibilities for physical, chemical or biological sensor applications.
Keywords :
delay-differential systems; multi-access systems; orthogonal codes; radiofrequency identification; surface acoustic wave sensors; transceivers; wireless sensor networks; analogue-digital circuitry design; differential delay line scheme; passive sensor unit; quasiorthogonal code; surface acoustic wave device; transceiver interrogation system; wireless identification system; wireless multiple access capability;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20081113
