Title :
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
fDate :
12/1/2000 12:00:00 AM
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;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
