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Remote vibration measurement: A wireless passive surface acoustic wave resonator fast probing strategy
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10.1063/1.4705728
/content/aip/journal/rsi/83/5/10.1063/1.4705728
http://aip.metastore.ingenta.com/content/aip/journal/rsi/83/5/10.1063/1.4705728
View: Figures

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.

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/content/aip/journal/rsi/83/5/10.1063/1.4705728
2012-05-01
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Remote vibration measurement: A wireless passive surface acoustic wave resonator fast probing strategy
http://aip.metastore.ingenta.com/content/aip/journal/rsi/83/5/10.1063/1.4705728
10.1063/1.4705728
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