Passive remote sensing for temperature and pressure using SAW resonator devices

Author

Buff, Werner ; Klett, Stefan ; Rusko, Marián ; Ehrenpfordt, Jochen ; Goroli, M.

Author_Institution

Inst. of Solid State Electron., Tech. Univ. of Ilmenau, Germany

Volume

45

Issue

5

fYear

1998

Firstpage

1388

Lastpage

1392

Abstract

Wireless sensing using passive sensors based on surface acoustic wave (SAW) technology is necessary for many applications. In this paper a new sensor design that uses the differential frequency output from two SAW resonators (SAWR) for temperature and pressure measurement is presented. The sensor, which consists of two SAWRs on the same substrate with different SAW propagation directions, relies on the variations of the SAW propagation velocity to measure environmental quantities such as pressure or temperature. The aim of this approach is to suppress the disturbing influences of the RF link (radio channel) between the interrogation unit and the passive sensor device. In this case, the output signal is a frequency difference and does not depend on changes in the radio channel during the transmission of the sensor signal.

Keywords

pressure sensors; radio links; radiotelemetry; remote sensing; surface acoustic wave resonators; surface acoustic wave sensors; temperature sensors; RF link; SAW propagation velocity; SAW resonator devices; differential frequency output; disturbing influences suppression; dual array; interrogation unit; passive remote sensing; pressure sensing; temperature sensing; wireless sensing; wireless telemetry; Acoustic sensors; Acoustic waves; Frequency; Pressure measurement; RF signals; Remote sensing; Surface acoustic waves; Temperature measurement; Temperature sensors; Wireless sensor networks;

fLanguage

English

Journal_Title

Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on

Publisher

ieee

ISSN

0885-3010

Type

jour

DOI

10.1109/58.726466

Filename

726466