Title :
Remote control of SAW resonators using a frequency-modulation-based interrogation strategy
Author :
Droit, C. ; Friedt, J.-M. ; Martin, G. ; Ballandras, S.
Author_Institution :
SENSeOR SAS, Besançon, France
Abstract :
Within the context of probing acoustic wave resonators acting as wireless, passive sensors, we present a strategy for wireless monitoring of surface acoustic wave (SAW) resonators using a frequency modulation based interrogation method. The basic principle is the conversion of frequency modulation to amplitude modulation by the resonator through its S11 transfer function. An ARM-7 based central processing unit synchronizes the narrow-band probing pulse emission, emission to reception switching, data sampling and data processing. A closed loop control keeps the emitted carrier frequency at the resonance frequency of the sensor: we demonstrate a resolution of 2 Hz on the resonance frequency identification at 1 s integration time, limited by this proportional feedback loop.
Keywords :
closed loop systems; frequency modulation; surface acoustic wave resonators; synchronisation; telecontrol; transfer functions; ARM-7 based central processing unit; S11 transfer function; SAW resonator remote control; acoustic wave resonator probing; amplitude modulation; carrier frequency; closed loop control; data processing; data sampling; frequency 2 Hz; frequency-modulation-based interrogation strategy; narrow-band probing pulse emission synhcronization; passive sensors; proportional feedback loop; reception switching; resonance frequency identification; surface acoustic wave resonators; wireless monitoring; Frequency modulation; Random access memory; Resonant frequency; Sensors; Time frequency analysis; Transfer functions;
Conference_Titel :
Frequency Control Symposium (FCS), 2010 IEEE International
Conference_Location :
Newport Beach, CA
Print_ISBN :
978-1-4244-6399-2
DOI :
10.1109/FREQ.2010.5556277
