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

fYear

2006

fDate

22-25 Oct. 2006

Firstpage

773

Lastpage

776

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Sensors, 2006. 5th IEEE Conference on

Conference_Location

Daegu

ISSN

1930-0395

Print_ISBN

1-4244-0375-8

Electronic_ISBN

1930-0395

Type

conf

DOI

10.1109/ICSENS.2007.355583

Filename

4178735