banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
Remote vibration measurement: A wireless passive surface acoustic wave resonator fast probing strategy
Rent this article for
View: Figures


Image of FIG. 1.
FIG. 1.

Simulation of the two-point interrogation strategy—each pulse is generated as a rectangular 30 μs long window—probing a resonator fitted with a Butterworth-van Dyke model (C 0 = 1.7 pF, C 1 = 0.56 F, L 1 = 241 μH, R 1 = 73 Ω).

Image of FIG. 2.
FIG. 2.

Experimental setup: A music tuning fork is fitted with a quartz strain gauge resonator interrogated through a wireless link. The interrogation algorithm is implemented in the flexible digital interrogation unit.

Image of FIG. 3.
FIG. 3.

Top right: Time domain records of the DAC output of the wireless acoustic sensor reader probing a quartz resonator strain gauge bound to a music tuning fork: the voice coil driving voltage at 442 Hz (maximum response amplitude) is increased from 0 to 1.8 V pp . As described in the text, the voltage-to-frequency conversion factor is 4.2 × 10−6 V/Hz, so that the 20 mV amplitude indicates a frequency shift amplitude of 362 Hz or a stress variation at the quartz strain gauge bound at the base of one of the prongs of about 650 kPa. Left: Fourier transform of the interrogation unit DAC voltage, sampled by a digital oscilloscope at 25 ksamples/s. The strain gauge signal is visible at 442 Hz—the driving voltage at resonance of the tuning fork (set at 441.737 Hz)—with a magnitude dependent on the driving signal amplitude, and vanishing when no excitation signal is applied (0 V). The interrogation unit sampling rate is visible at f s /2 = 2412 Hz, with a power independent on the voice coil driving voltage.

Image of FIG. 4.
FIG. 4.

Top: Two-minute measurement of the frequency output of the resonator interrogation unit running the two-point algorithm, here with a digital communication of the measurement through an asynchronous serial link, yielding a rather slow measurement rate of 135 Hz. Bottom: Allan deviation of the resulting dataset, exhibiting a sub-kHz standard deviation (two-point standard deviaton) and sub-100 Hz Allan deviation at 1 s (135 sample averages) integration time.


Article metrics loading...


Full text loading...

This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Remote vibration measurement: A wireless passive surface acoustic wave resonator fast probing strategy