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The Measurement of Unsteady Surface Pressure Using a Remote Microphone Probe
Published on: December 3, 2016
Remote vibration measurement: a wireless passive surface acoustic wave resonator fast probing strategy
J-M Friedt1, C Droit, S Ballandras
1SENSeOR SAS, Besançon, France. jmfriedt@femto-st.fr
The Review of Scientific Instruments
|June 7, 2012
Summary
This study demonstrates a fast measurement scheme for surface acoustic wave (SAW) resonators, enabling wireless, battery-less sensors for structural health monitoring. The new method achieves a 4800 Hz update rate for accurate stress and vibration analysis.
Area of Science:
- Physics
- Materials Science
- Electrical Engineering
Background:
- Surface acoustic wave (SAW) resonators offer wireless, battery-less sensing for structural health monitoring.
- Measuring wideband vibrations with SAW resonators is challenging due to bandwidth limitations.
Purpose of the Study:
- To demonstrate a fast measurement scheme for SAW resonators.
- To overcome bandwidth limitations in measuring wideband vibrations.
- To enable high-speed stress and vibration analysis in mechanical structures.
Main Methods:
- Utilized a monostatic RADAR-like electronic setup with two probe pulses.
- Leveraged the physical settling time of the SAW resonator (Q/π periods) to limit measurement bandwidth.
- Employed a high quality factor SAW resonator operating in the 434 MHz ISM band.
Main Results:
- Achieved a measurement update rate of 4800 Hz.
- Successfully identified the sensor resonance frequency for stress measurement.
- Demonstrated the feasibility of fast interrogation for SAW strain gauges.
Conclusions:
- The developed fast SAW resonator measurement scheme significantly enhances bandwidth for vibration analysis.
- This technology enables efficient wireless, battery-less structural health monitoring.
- The high update rate is crucial for capturing dynamic characteristics of mechanical structures.
