DocumentCode :
667800
Title :
A stroboscopic approach to surface acoustic wave delay line interrogation
Author :
Chretien, N. ; Friedt, J.-M. ; Martin, G. ; Ballandras, S.
Author_Institution :
SENSeOR, Besancon, France
fYear :
2013
fDate :
21-25 July 2013
Firstpage :
771
Lastpage :
774
Abstract :
A pulsed RADAR approach is investigated to probe acoustic delay lines used as passive sensors. In order to comply with the requirements of compact, low power receiver electronics, a stroboscopic equivalent time sampling approach is demonstrated. A strategy for generating high resolution time delays while allowing for long interrogation durations (up to 5 μs) is implemented by combining an FPGA-based delay generator with commercially available programmable digital delay lines. The measurement sequence of generating interleaved combs is due to the long delay line reconfiguration duration (SPI communication) with respect to the coarse comb (FPGA based counter). The response of the sensor is recorded and processed to acquire the coarse acoustic velocity information through magnitude measurement, and an accurate physical quantity estimate is computed thanks to the phase information. We demonstrate an improved software measurement strategy which prevents the slow process associated with a stroboscopic approach and allows to reach refresh rates of up to 20 kHz when probing an acoustic tag for a physical property measurement, while keeping the hardware to a bare minimum.
Keywords :
acoustic delay lines; field programmable gate arrays; radar signal processing; surface acoustic wave sensors; FPGA-based delay generator; low power receiver electronics; passive sensors; physical property measurement; probe acoustic delay lines; pulsed radar approach; stroboscopic approach; surface acoustic wave delay line interrogation; Acoustic measurements; Acoustics; Bandwidth; Delay lines; Delays; Radar; Sensors;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
European Frequency and Time Forum & International Frequency Control Symposium (EFTF/IFC), 2013 Joint
Conference_Location :
Prague
Type :
conf
DOI :
10.1109/EFTF-IFC.2013.6702160
Filename :
6702160
Link To Document :
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