A wireless interrogation system exploiting narrowband acoustic resonator for remote physical quantity measurement
- SENSeOR, 32 Avenue de l'Observatoire, 25044 Besancon (France)
- Department of Time and Frequency, FEMTO-ST, 32 Avenue de l'Observatoire, 25044 Besancon (France)
Monitoring physical quantities using acoustic wave devices can be advantageously achieved using the wave characteristic dependence to various parametric perturbations (temperature, stress, and pressure). Surface acoustic wave (SAW) resonators are particularly well suited to such applications as their resonance frequency is directly influenced by these perturbations, modifying both the phase velocity and resonance conditions. Moreover, the intrinsic radio frequency (rf) nature of these devices makes them ideal for wireless applications, mainly exploiting antennas reciprocity and piezoelectric reversibility. In this paper, we present a wireless SAW sensor interrogation unit operating in the 434 MHz centered ISM band--selected as a tradeoff between antenna dimensions and electromagnetic wave penetration in dielectric media--based on the principles of a frequency sweep network analyzer. We particularly focus on the compliance with the ISM standard which reveals complicated by the need for switching from emission to reception modes similarly to radar operation. In this matter, we propose a fully digital rf synthesis chain to develop various interrogation strategies to overcome the corresponding difficulties and comply with the above-mentioned standard. We finally assess the reader interrogation range, accuracy, and dynamics.
- OSTI ID:
- 22053626
- Journal Information:
- Review of Scientific Instruments, Vol. 81, Issue 1; Other Information: (c) 2010 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACCURACY
ANTENNAS
DIELECTRIC MATERIALS
DISTURBANCES
MHZ RANGE
PHASE VELOCITY
PHYSICAL PROPERTIES
PIEZOELECTRICITY
PRESSURE MEASUREMENT
RADAR
RADIOWAVE RADIATION
RESONATORS
SENSORS
SIGNALS
SOUND WAVES
STRESSES
SURFACES
TEMPERATURE MONITORING