A wireless pressure-measurement system using a SAW hybrid sensor

Author

Schimetta, Gernot ; Dollinger, Franz ; Weigel, Robert

Author_Institution

Inst. for Commun. & Inf. Eng., Johannes Kepler Univ., Linz, Austria

Volume

48

Issue

12

fYear

2000

fDate

12/1/2000 12:00:00 AM

Firstpage

2730

Lastpage

2735

Abstract

A pressure-measurement system based on surface-acoustic-wave (SAW) sensors is presented in this paper. Since SAW sensors are powered by the energy of the RF field, no battery is required, which is a major drawback of conventional microcontroller-based telemetry systems. A successful combination of a SAW reflective delay line with a high-Q capacitive pressure sensor is shown, With a new way of matching the sensor impedance to the SAW reflector impedance, both a high signal-to-noise ratio and a high signal dynamic are achieved, which supports accurate signal evaluation. As an example of realization, the prototype of the pressure sensor unit is presented

Keywords

capacitive sensors; pressure sensors; surface acoustic wave delay lines; surface acoustic wave sensors; telemetry; SAW hybrid sensor; high-Q capacitive pressure sensor; reflective delay line; sensor impedance; signal dynamic; signal evaluation; signal-to-noise ratio; wireless pressure-measurement system; Batteries; Capacitive sensors; Delay lines; Impedance; Radio frequency; Sensor systems; Signal to noise ratio; Surface acoustic waves; Telemetry; Wireless sensor networks;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.899037

Filename

899037