Acoustic Wave Sensors and Responses

Ballantine, David S.; Martin, Stephen J.; Ricco, Antonio J.; Frye, G.C.; Wohltjen, H.; White, Richard M.; Zellers, Edward T.

doi:10.1016/b978-012077460-9/50003-4

Cited by 405 publications

(250 citation statements)

References 46 publications

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“…Acoustic sensors can operate effectively in liquids, in which they are suitable for the detection of mass deposited on the sensor surface 1 or for the determination of solution viscosity. [2][3][4] The use of acoustic sensors is being extended to biological applications, 5,6 which often involve the detection of high molecular weight solutes such as proteins or DNA.…”

Section: Introductionmentioning

confidence: 99%

Acoustic determination of polymer molecular weights and rotation times

Melzak

Martin

Newton

et al. 2002

J Polym Sci B Polym Phys

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An acoustic waveguide device was shown to be sensitive to the molecular weight of poly(ethylene glycol) in solution over a molecular weight range determined by the operating frequency of the device. The acoustic device used generates a shear wave with displacement in the plane of the device surface and normal to the direction of propagation. Liquid over the device exhibits viscous coupling to the oscillating surface, affecting propagation of the acoustic wave. The propagation loss was shown to be directly proportional to the weight percentage of the solute. For a given weight percent of polymer in solution, the loss increased with increasing molecular weight until a maximum loss value was reached; this may be due to the fact that rotational times for polymer molecules increase with molecular weight until they reach a point at which the rotation is limited by the oscillation time on the device surface. The molecular weight at which the maximum loss value was attained was 10,000 g/mol for a device operating at 104 MHz and 3350 g/mol for a device operating at 331 MHz, implying a rotational time of 1 ns for each 2200 increase in molecular weight.

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Section: Introductionmentioning

confidence: 99%

Acoustic determination of polymer molecular weights and rotation times

Melzak

Martin

Newton

et al. 2002

J Polym Sci B Polym Phys

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“…[1][2][3] When the mass being sensed is deposited from the liquid phase or the focus of the application is to sense the properties of a liquid phase, the most obvious choice of acoustic wave mode is one with a shear horizontal polarization to the displacement. This is because, for most acoustic wave devices, an out-of-plane motion would induce a compressional ͑sound͒ wave in the liquid and so cause high damping.…”

Section: Introductionmentioning

confidence: 99%

Theoretical mass, liquid, and polymer sensitivity of acoustic wave sensors with viscoelastic guiding layers

McHale

Newton

Martin

2003

Journal of Applied Physics

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The theoretical sensitivity of Love wave and layer-guided shear horizontal acoustic plate mode ͑SH-APM͒ sensors for viscoelastic guiding layers and general loading by viscoelastic materials is developed. A dispersion equation previously derived for a system of three rigidly coupled elastic mass layers is modified so that the second and third layers can be viscoelastic. The inclusion of viscoelasticity into the second, wave guiding layer, introduces a damping term, in addition to a phase velocity shift, into the response of the acoustic wave system. Both the waveguiding layer and the third, perturbing layer, are modeled using a Maxwell model of viscoelasticity. The model therefore includes the limits of loading of both nonguided shear horizontal surface acoustic wave and acoustic plate mode ͑APM͒ sensors, in addition to Love wave and layer-guided SH-APM sensors, by rigidly coupled elastic mass and by Newtonian liquids. The three-layer model is extended to include a viscoelastic fourth layer of arbitrary thickness and so enable mass deposition onto an immersed Love wave or layer-guided SH-APM sensor to be described. A relationship between the change in the complex velocity and the slope of the complex dispersion curve is derived and the similarity to the mass and liquid sensor response of quartz crystal microbalances is discussed. Numerical calculations are presented for the case of a Love wave device in vacuum with a viscoelastic waveguiding layer. It is shown that, while a particular polymer relaxation time may be chosen such that the effect of viscoelasticity on the real part of the phase speed is relatively small, it may nonetheless induce a large insertion loss. The potential or the use of insertion loss as a sensor parameter is discussed.

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“…Finally, another transduction mechanism studied is the piezoelectric effect which is the principle behind the Acoustic Waves devices used for humidity or gas sensing [15]. Between these devices are the Surface Acoustic Wave (SAW) shown in figure 2.25.…”

Section: Packaging Typesmentioning

confidence: 99%

“…As presented by Ballantine [15], the general working relationship between the frequency changes and mass loading effect for any acoustic wave device can be expressed based on mass sensitivity as follows: Where is the operating frequency of the device.…”

Section: Analytical Saw Mass-only Responsementioning

confidence: 99%

Humidity Sensor Based on Mems Saw Technology

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Acoustic Wave Sensors and Responses

Cited by 405 publications

References 46 publications

Acoustic determination of polymer molecular weights and rotation times

Acoustic determination of polymer molecular weights and rotation times

Theoretical mass, liquid, and polymer sensitivity of acoustic wave sensors with viscoelastic guiding layers

Humidity Sensor Based on Mems Saw Technology

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