Title :
2.45 GHz Passive Wireless Temperature Monitoring System Featuring Parallel Sensor Interrogation and Resolution Evaluation
Author :
Kuypers, J.H. ; Tanaka, S. ; Esashi, M. ; Eisele, D.A. ; Reindl, L.M.
Author_Institution :
Tohoku Univ., Sendai
Abstract :
We report on the development of a TDMA (time division multiple access) based wireless sensor system for temperature monitoring. The transponders consisting of passive surface acoustic wave delay line sensors were designed for operation in the ISM band at 2.45 GHz and for a temperature range from -20degC to 180degC. A multi-step evaluation scheme using a combined delay and phase analysis, is introduced. A temperature resolution of 0.19 K (6sigma) was achieved at a transmission power of +2 dBm (1.59 mW), when the distance between the transceiver and sensors was about 140 cm. We also report the importance of mounting the sensors during packaging based on experimental results.
Keywords :
radiotelemetry; surface acoustic wave delay lines; surface acoustic wave sensors; temperature sensors; time division multiple access; transponders; wireless sensor networks; frequency 2.45 GHz; parallel sensor interrogation; parallel sensor resolution evaluation; passive surface acoustic wave delay line sensors; passive wireless temperature monitoring; power 1.59 mW; temperature -20 degC to 180 degC; time division multiple access; transponders; wireless sensor system; Acoustic sensors; Acoustic waves; Delay lines; Sensor systems; Surface acoustic waves; Temperature measurement; Temperature sensors; Time division multiple access; Transponders; Wireless sensor networks;
Conference_Titel :
Sensors, 2006. 5th IEEE Conference on
Conference_Location :
Daegu
Print_ISBN :
1-4244-0375-8
Electronic_ISBN :
1930-0395
DOI :
10.1109/ICSENS.2007.355583
