Title :
Impedance loaded SAW-sensors offer a wide range of measurement opportunities
Author :
Steindl, R. ; Pohl, A. ; Seifert, F.
Author_Institution :
Appl. Electron. Lab., Univ. of Technol., Vienna, Austria
Abstract :
SAW ID-tags can be employed as passive transponders for conventional sensors of capacitive, inductive and resistive type. An interdigital transducer (IDT) is used as a loadable reflector, other fixed reflectors are used as reference bits. The load of the programmable reflector influences both the phase and amplitude of the reflected wave. The principle is discussed, applications for the measurement of light, pressure and temperature are presented.
Keywords :
electric impedance; optical sensors; pressure sensors; surface acoustic wave sensors; surface acoustic wave transducers; temperature sensors; IDT; SAW ID-tags; amplitude; capacitive type sensor; fixed reflector; impedance loaded SAW-sensors; inductive type sensor; interdigital transducer; light; loadable reflector; measurement opportunities; passive transponders; phase; pressure; programmable reflector; reflected wave; resistive type sensor; temperature; Acoustic measurements; Acoustic sensors; Impedance measurement; Magnetic sensors; Mechanical sensors; Radio frequency; Sensor phenomena and characterization; Sensor systems; Surface acoustic waves; Transponders;
Conference_Titel :
Microwave Symposium Digest, 1999 IEEE MTT-S International
Conference_Location :
Anaheim, CA, USA
Print_ISBN :
0-7803-5135-5
DOI :
10.1109/MWSYM.1999.780223
