Surface properties of solids and surface acoustic waves: Application to chemical sensors and layer characterization

Krylov, Victor V.

doi:10.1007/bf01538187

Cited by 15 publications

(5 citation statements)

References 20 publications

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“…The contribution of surface modi cations of solids to the formation of acoustic elds near solid surfaces can be described naturally by means of specially constructed nonclassical boundary conditions [8][9][10]:…”

Section: Effect Of Adsorbed Gas Molecules On Rayleigh Wave Propagationmentioning

confidence: 99%

“…+ Ps v = 0-(1) so. _ Unn' Wn,aa+P "n 0-Here am is the elastic stress tensor, u, is the displacement vector, is, '11:, p and r are the so called integral surface parameters describing the effects of modi cations of mechanical properties of solid surfaces [8][9][10], comma denotes di erentiation with respect to surface coordinates 2:3…”

Section: Effect Of Adsorbed Gas Molecules On Rayleigh Wave Propagationmentioning

confidence: 99%

“…This is probably not surprising considering the fact that it can not be readily incorporated into the classical continuum theory used in [2,3]. The nonclassical, or better to say semi-classical, approach to the theory of Rayleigh wave propagation in layered stnrctures with adsorbed molecules, which describes surface modi cations in terms of integral surface parameters [8][9][10], is free of these limitations and, in our opinion, provides the most advanced description of surface acoustic wave chemical sensors.…”

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confidence: 99%

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Theory of Chemical Sensors Using Surface Acoustic Waves

KRYLOV

2024

Autumn Conference 1995 - Physical Acoustics Symposium

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Surface acoustic waves in solids, especially Rayleigh waves, have a number of useful applications. These involve ultrasonic nondestructive testing, portable radio communication systems (including mobile telephones), and different types of sensors. A special very important application of surface acoustic waves propagating along inhomogeneous subsurface layers is chemical sensors used for detecting and measuring concentrations of surrounding gases or liquids [1][2][3][4][5][6][7]. The work of these devices is usually based on change in velocities of surface acoustic waves as a result of their interaction with liquid or gas molecules adsorbed by specially deposited selective thin lms.Despite a number of success rl experimental investigations of surface acoustic wave chemical sensors, their current theoretical description is far from satisfactory. In the existing theoretical papers only a qualitative explanation of the sensor's sensitivity to measured gas or liquid

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Section: Effect Of Adsorbed Gas Molecules On Rayleigh Wave Propagationmentioning

confidence: 99%

Section: Effect Of Adsorbed Gas Molecules On Rayleigh Wave Propagationmentioning

confidence: 99%

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confidence: 99%

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Theory of Chemical Sensors Using Surface Acoustic Waves

KRYLOV

2024

Autumn Conference 1995 - Physical Acoustics Symposium

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“…Krylov [7] found in his research that even a small truncation will cause the reflection coefficient of the ABH structure to increase significantly. In order to reduce the impact of truncation on the ABH structure, Krylov and Shuvalov have found that pasting a certain damping material in the area of the ABH can significantly reduce the reflection coefficient of bending waves [8,9]. Furthermore, the effects of the material and geometrical parameters of the damping layer and the ABH structure on the dynamic properties of the ABH beam are analyzed through theory and experiments [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Dynamic property investigation of segmented acoustic black hole beam with different power-law thicknesses

et al. 2021

Smart Mater. Struct.

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Traditional acoustic black hole (ABH) structure that usually has a wedge-shaped structure with unchanged power-law profile has been studied extensively. Embedding an ABH in a thin-walled structure can help the system to control the flexural wave to realize vibration damping and energy concentration. However, due to the limitations of processing and manufacturing technology, the structural thickness of the ABH region cannot completely reach zero and will always leave a truncation at the tip of the ABH region, which makes ABH structure cannot give full play to the effect of ABH. In this paper, we show that a beam with segmented ABH structure whose baseline is segmented into two portions and they are respectively subjected to different power functions can effectively improve the effect of ABH. A semi-analytical method is adopted to establish the dynamical model of the segmented ABH beam under the clamped-free boundary condition. Finite element method and experimental method are carried out to verify the accuracy of the semi-analytical model. The segmented ABH effect of the beam is analyzed by the comparison of segmented ABH beam, conventional ABH beam, and uniform beam. In addition, the influence of the damping layer location on the dynamic response of the segmented ABH beam is studied as well. The numerical simulation results show that the vibration energy of segmented ABH beam can be more effectively shifted to the ABH area, thus enhancing the energy concentration effect and vibration attenuation. Moreover, the results also reveal that attaching the damping layer to the tip of the segmented ABH structure can effectively improve the system modal loss factor and achieve better vibration attenuation. The research of this paper can give rise to explorations of different innovative ABH structures and broaden the application of ABH beam structures in engineering.

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“…The existed theoretical research methods include the geometrical acoustic approach (Krylov, 1995, 2004; Krylov and Tilman, 2004), the impedance method (Georgiev et al, 2011), the semi-analytical method based on the Lagrange variation principle (Tang and Cheng, 2016; Tang et al, 2016), and so on. The properties of ABH effect, such as the propagation and reflection of bending waves (Krylov, 2004; Krylov and Tilman, 2004), the waves attenuation by thin damping layers (Krylov, 1995), and so on, were analyzed through the geometrical acoustic approach by Krylov et al However, this method cannot deal with the coupling problems between wedges and additional functional materials because of some hypotheses. Georgiev et al (2011) used the impedance method to obtain some conclusions similar to the geometrical acoustic approach, without the limitation of those hypotheses.…”

Section: Introductionmentioning

confidence: 99%

Analysis on vibration energy concentration of the one-dimensional wedge-shaped acoustic black hole structure

Ding

2018

Journal of Intelligent Material Systems and Structures

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The transverse vibration energy of a plate with a wedge-shaped profile can be trapped by acoustic black hole effect to its edge portion, in case the wedge thickness is diminished according to the power-law h(x) = εxm with m ≥ 2.0. The acoustic black hole effect exhibits potential ability for passive vibration control and energy harvesting. In this article, the transfer matrix method is adopted to establish and solve the dynamical model of acoustic black hole structure. Energy ratio is defined as a ratio of the energy trapped within the edge portion to that of the whole wedge, to illustrate the energy concentration effect. Analyses show that both the strain energy ratio and kinetic energy ratio of the acoustic black hole structure achieve the minimum when the wedge is in resonances, although these two kinds of energy come to peaks at this case. However, in the case of small length of the edge portion, the strain energy ratio reaches the highest peaks at the second and higher resonances, rather than at the first one. Generally, the best effect of energy concentration occurs when m ranges from 2.5 to 3.0. Reducing the truncation thickness and increasing the maximum height can improve the energy trapping.

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Surface properties of solids and surface acoustic waves: Application to chemical sensors and layer characterization

Cited by 15 publications

References 20 publications

Theory of Chemical Sensors Using Surface Acoustic Waves

Theory of Chemical Sensors Using Surface Acoustic Waves

Dynamic property investigation of segmented acoustic black hole beam with different power-law thicknesses

Analysis on vibration energy concentration of the one-dimensional wedge-shaped acoustic black hole structure

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