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Ground Penetrating RADAR (GPR) is a classical sub-surface analysis tool widely used in civil engineering and environmental investigations. Currently limited to monitoring passive buried dielectric and conductivity interfaces, the instrument is perfectly suited to probe cooperative targets made of piezoelectric substrates designed to convert the incoming electromagnetic wave to an acoustic wave. The...
Surface acoustic wave (SAW) gas sensors generally require the use of a reactive layer for molecule adsorption. WO3 has been identified for a long time as a high potential sensitive layer particularly for NH3, NOX, CO, etc. We report here on the characterization of elastic properties of such material using the dispersion behavior of SAW propagating under gratings passivated wich WO3 films of various...
Acoustic wave devices are well known passive transducers for probing through a wireless link a physical quantity. Amongst the two main classes of designs - resonators and delay lines - the former have the advantage of providing informations in a narrow band signal and are hence compatible with an interrogation strategy compliant with radiofrequency (RF) emission regulations, while the latter are probed...
Acoustic wave devices are well known passive transducers for probing through a wireless link a physical quantity. Amongst the two main classes of designs-resonators and delay lines-the former have the advantage of providing informations in a narrow band signal and are hence compatible with an interrogation strategy compliant with radiofrequency (RF) emission regulations, while the latter are probed...
The thermal sensitivity of acoustic-wave-based devices still is an optimization key-point for various applications (filters, sources, sensors). As the architecture of such devices becomes more and more complex to fit the RF manufacturer requirements, simple analytical models usually exploited to optimize their frequency thermal drift are found obsolete. The optimization of these complex periodic wave-guide...
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