SAW strain sensitivity of selected rayleigh wave crystal cuts

Bruckner, Gudrun; Stampf, Gernot; Franz, Georg; Fachberger, R.; Hauser, Robert G.

doi:10.1109/ultsym.2009.5442070

Cited by 10 publications

(3 citation statements)

References 8 publications

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“…Theoretical calculations of the strain dependency of SAWs require the knowledge of third order elastic constants, are elaborate and, usually, include geometric boundary conditions. To avoid this, we used a combination of experimental investigations and simulations to determine the strain sensitivity of the lithiumniobate substrate [21]. We have chosen the well-defined and simple geometry of a bending beam to apply a well-defined force on a SAW delay line made on lithiumniobate.…”

Section: Conceptmentioning

confidence: 99%

B1.3 - Design Study of a Wireless Pressure Sensor for Medical Application

Bruckner¹,

Schicker²,

Schobernig³

et al. 2013

Proceedings SENSOR 2013

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Section: Conceptmentioning

confidence: 99%

B1.3 - Design Study of a Wireless Pressure Sensor for Medical Application

Bruckner¹,

Schicker²,

Schobernig³

et al. 2013

Proceedings SENSOR 2013

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“…This case is applied here to the particular application of measuring the stress at the surface of a strain gauge bound to a musical tuning fork oscillating at about 440 Hz so that ω 2765 rad s −1 . Since s α 10 −11 MPa Hz −1 for quartz, 10,11 for a strain gauge operating at 434 MHz and sampled at 10 kHz, then T 0 < 4.2 MPa. This limitation is significantly lower than the rupture stress of quartz of about 100 MPa.…”

Section: Strain Gauge Measurementmentioning

confidence: 99%

“…Using the tabulated ST-cut Rayleigh wave sensitivity 10 of −16.8 ppm/MPa, as experimentally validated in Ref. 11, the stress variation at the base of a prong of the tuning fork is 650 kPa pp . The actual sampling rate of f s = 4800 Hz (Fig.…”

Section: Wireless Stress Monitoring Of a Vibrating Structurementioning

confidence: 99%

Remote vibration measurement: A wireless passive surface acoustic wave resonator fast probing strategy

Friedt¹,

Droit²,

Ballandras

et al. 2012

Review of Scientific Instruments

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Surface acoustic wave (SAW) resonators can advantageously operate as passive sensors which can be interrogated through a wireless link. Amongst the practical applications of such devices, structural health monitoring through stress measurement and more generally vibration characteristics of mechanical structures benefit from the ability to bury such sensors within the considered structure (wireless and battery-less). However, measurement bandwidth becomes a significant challenge when measuring wideband vibration characteristics of mechanical structures. A fast SAW resonator measurement scheme is demonstrated here. The measurement bandwidth is limited by the physical settling time of the resonator (Q/π periods), requiring only two probe pulses through a monostatic RADAR-like electronic setup to identify the sensor resonance frequency and hence stress on a resonator acting as a strain gauge. A measurement update rate of 4800 Hz using a high quality factor SAW resonator operating in the 434 MHz Industrial, Scientific and Medical band is experimentally demonstrated.

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Performance comparison of Rayleigh and STW modes on quartz crystal for strain sensor application

Fu¹,

Lee²,

Eun

et al. 2016

Journal of Applied Physics

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In this study, we compare two kinds of strain sensors based on Rayleigh wave and surface transverse wave (STW) modes, respectively. First, we perform a strain-and-stress analysis using the finite element method, and we consider the contribution to a surface acoustic wave (SAW) velocity shift. Prior to fabrication, we use a coupling-of-modes model to simulate and optimize two-port SAW resonators for both modes. We use a network analyzer to measure and characterize the two devices. Further, we perform an experiment using a strain-testing system with a tapered cross-section cantilever beam. The experimental results show that the ratio of the frequency shift to the strain for the Rayleigh wave mode is −1.124 ppm/με in the parallel direction and 0.109 ppm/με in the perpendicular direction, while the corresponding values for the STW mode are 0.680 ppm/με and 0.189 ppm/με, respectively.

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SAW strain sensitivity of selected rayleigh wave crystal cuts

Cited by 10 publications

References 8 publications

B1.3 - Design Study of a Wireless Pressure Sensor for Medical Application

B1.3 - Design Study of a Wireless Pressure Sensor for Medical Application

Remote vibration measurement: A wireless passive surface acoustic wave resonator fast probing strategy

Performance comparison of Rayleigh and STW modes on quartz crystal for strain sensor application

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