Title :
Wireless pressure and temperature measurement using a SAW hybrid sensor
Author :
Schimetta, G. ; Dollinger, F. ; Scholl, G. ; Weigel, R.
Author_Institution :
Inst. of Commun. & Inf. Eng., Johannes Kepler Univ., Linz, Austria
Abstract :
A passive pressure and temperature sensor unit based on the combination of a SAW reflective delay line with a high-Q capacitive pressure sensor is presented. Due to a symmetric arrangement of the impedance loaded splitfinger interdigital transducer (IDT) between two reference reflectors a temperature corrected evaluation of the pressure signal is enabled. A prototype of a tire pressure sensor unit is shown. In combination with a wheel arch antenna and a conventional transceiver unit a typical signal-to-noise rate of 20 dB resulting in a pressure accuracy of ±15 kPa was measured
Keywords :
capacitive sensors; interdigital transducers; pressure sensors; surface acoustic wave delay lines; surface acoustic wave sensors; temperature sensors; SAW passive hybrid sensor; SAW reflective delay line; capacitive pressure sensor; interdigital transducer; signal-to-noise ratio; temperature sensor; tire pressure sensor; transceiver; wheel arch antenna; wireless measurement; Capacitive sensors; Delay lines; Impedance; Prototypes; Surface acoustic waves; Temperature measurement; Temperature sensors; Tires; Transducers; Wireless sensor networks;
Conference_Titel :
Ultrasonics Symposium, 2000 IEEE
Conference_Location :
San Juan
Print_ISBN :
0-7803-6365-5
DOI :
10.1109/ULTSYM.2000.922590
