Title :
P1I-9 Passive 2.45 GHz TDMA based Multi-Sensor Wireless Temperature Monitoring System: Results and Design Considerations
Author :
Kuypers, J.H. ; Tanaka, S. ; Esashi, M. ; Eisele, D.A. ; Reindl, L.M.
Author_Institution :
Dept. of Nanomechanics, Tohoku Univ., Sendai
Abstract :
This paper presents a TDMA (time division multiple access) based wireless temperature monitoring system using 2.45 GHz passive surface acoustic wave (SAW) delay line sensors. A three-step resolution refinement scheme using a combined delay and phase evaluation is proposed. Using a transmission power of 2 dBm (1.59 mW) a temperature accuracy of 0.19 K and 0.1 K(6sigma), were achieved for an interrogation distance of 1.4 m, and 1.3 m, respectively. The sensor design is discussed using experimental results concerning the relationship between the SNR (signal to noise ratio) of the sensors and the accuracy in time delay or phase measurement. Also, the direct electron beam writing on chemically-reduced (black) LiNbO3 is described
Keywords :
delay lines; sensor fusion; surface acoustic wave sensors; temperature sensors; time division multiple access; 1.59 mW; 2.45 GHz; LiNbO3; delay line sensor; direct electron beam writing; interrogation distance; passive TDMA based multisensor; passive surface acoustic wave sensor; phase measurement; sensor design; signal to noise ratio; three-step resolution refinement scheme; time delay; time division multiple access; transmission power; wireless temperature monitoring system; Acoustic waves; Chemical sensors; Delay lines; Sensor systems; Signal to noise ratio; Surface acoustic waves; Temperature measurement; Temperature sensors; Time division multiple access; Wireless sensor networks;
Conference_Titel :
Ultrasonics Symposium, 2006. IEEE
Conference_Location :
Vancouver, BC
Print_ISBN :
1-4244-0201-8
Electronic_ISBN :
1051-0117
DOI :
10.1109/ULTSYM.2006.366
