Title :
A wireless pressure measurement system using a SAW hybrid sensor
Author :
Schimetta, G. ; Dollinger, F. ; Weigel, R.
Author_Institution :
Inst. for Commun. & Inf. Eng., Linz Univ., Austria
Abstract :
A pressure measuring system based on surface acoustic wave (SAW) sensors is presented. 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 a tyre pressure sensor unit is presented.
Keywords :
Capacitive sensors; Impedance matching; Pressure measurement; Pressure sensors; Radiotelemetry; Surface acoustic wave delay lines; Surface acoustic wave sensors; SAW hybrid sensor; SAW reflective delay line; SAW reflector impedance; high SNR; high signal dynamic; high-Q capacitive pressure sensor; sensor impedance; signal-to-noise ratio; surface acoustic wave sensors; telemetry system; tyre pressure sensor unit; wireless pressure measurement system; Acoustic measurements; Acoustic sensors; Acoustic waves; Battery charge measurement; Impedance; Pressure measurement; Radio frequency; Sensor systems; Surface acoustic waves; Wireless sensor networks;
Conference_Titel :
Microwave Symposium Digest. 2000 IEEE MTT-S International
Conference_Location :
Boston, MA, USA
Print_ISBN :
0-7803-5687-X
DOI :
10.1109/MWSYM.2000.862237
