Impedance loaded SAW sensors offer a wide range of measurement opportunities

Surface-acoustic-wave interdigital tags can be employed as passive transponders for conventional sensors of capacitive, inductive, and resistive types. An interdigital transducer is used as a loadable reflector, while other fixed reflectors are used as reference bits. The load of the programmable re...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 1999-12, Vol.47 (12), p.2625-2629
Main Authors: Steindl, R., Pohl, A., Seifert, F.
Format: Article
Language:English
Subjects:
Acoustic measurements
Acoustic sensors
Amplitudes
Circuits
Impedance
Impedance measurement
Interdigital transducers
Magnetic sensors
Microwaves
Radio frequency
Reflectors
Sensor systems
Sensors
Surface acoustic wave devices
Surface acoustic waves
Tags
Temperature sensors
Transponders
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Summary:Surface-acoustic-wave interdigital tags can be employed as passive transponders for conventional sensors of capacitive, inductive, and resistive types. An interdigital transducer is used as a loadable reflector, while 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, and applications for the measurement of light, pressure, and temperature are presented in this paper.
ISSN:0018-9480
1557-9670
DOI:10.1109/22.809016