Investigation of Rayleigh wave attenuation via annular lenses in acoustic microscopy

Bouhedja, Samia; Hadjoub, I.; Doghmane, A.; Hadjoub, Z.

doi:10.1002/pssa.200420013

Cited by 15 publications

(5 citation statements)

References 18 publications

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“…The amplitude of reflection function tends towards the unit due to the total reflection of energy. The effects of annular lenses on acoustic signatures and their FFT spectrum are illustrated recently by many works for bulk materials [7].…”

Section: Resultsmentioning

confidence: 97%

Study of Biomaterials Acoustic Signature Using Annular Lenses

Bouhedja

Hamdi

2011

AMR

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In this work, we study the microstructure of porous alumina Al2O3 through the acoustic signature behavior V(z). This function depends on the low porosity when annular lenses conditions at an operating frequency of 1 GHz are used. In non destructive control, this quantitative investigation which allows the determination of mechanical materials properties is of a great importance in the measurement of the surface waves attenuation in this type of biomaterials. Hence, we have numerically simulated the porous alumina acoustic signatures through variable occultation of generating rays at the lens center, in order to quantify the occultation limiting angle. Consequently, the evaluation of the equivalent Rayleigh velocity using the fast Fourier transform (F.F.T) spectra was achieved thanks to the suppression of the Rayleigh mode generation.

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Section: Resultsmentioning

confidence: 97%

Study of Biomaterials Acoustic Signature Using Annular Lenses

Bouhedja

Hamdi

2011

AMR

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“…Among the most promising tools that have demonstrated a variety of unique capabilities in quantitative and qualitative characterisation of surface and subsurface details are scanning acoustic microscopes, SAM. The principles underlying the SAM have been described in detail elsewhere [8][9][10] and will not be reiterated here. Suffice to say that the simulation carried out in this study concerns the most conventional SAM under its normal operating conditions.…”

Section: Calculation Proceduresmentioning

confidence: 99%

Origin and quantification of anomalous behaviour in velocity dispersion curves of stiffening layer/substrate configurations

Hadjoub

Beldi

Doghmane

2007

Comptes Rendus. Physique

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Layer stiffening effects are studied via positive dispersion curves calculated for several layer/substrate configurations. The investigated layers (ZnO, Al, SiO 2 , Cr, Si, SiC, AlN, Si 3 N 4 and Al 2 O 3 ) deposited on Cu and/or Si substrates, showed two types of anomalous behaviour: velocities greater than the layer Rayleigh velocity and those smaller that the substrate Rayleigh velocity. The appearance and disappearance of these phenomena are analysed and quantified in terms of a suggested elastic parameter, ξ , which shows that their origin is due the combined effect of the velocities and densities of both the layer and the substrate.

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“…Therefore, from the V(z) free oscillation curves it is possible to determine the attenuation coefficient that is related to the exponential decay [24,29,30]. Hence, from the fitting of the completely attenuated curve of Fig.…”

Section: Thickness Effects On V(z) Signaturesmentioning

confidence: 99%

Microacoustic evaluation of elastic parameters of highly porous silicon layers

Doghmane¹

2006

Semicond. phys. quantum electron. optoelectron.

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Non-destructive scanning acoustic microscopy investigations of elastic properties of porous silicon films, limited to low and medium porosities, are extended in this work to higher porosities (80 %) corresponding to the appearance of room temperature electroluminescence phenomena. Acoustic materials signatures were measured at various operating frequencies, f, and film thickness, d. It was shown that as these parameters increase the oscillatory V(z) behaviour disappears progressively to become completely attenuated, for f = 565 MHz and d = 6 µm, due to wave absorption, with α x = 0.2 µm −1. Moreover, from high frequency microechography, it was possible to determine longitudinal velocity, V L = 1680 m/s. To evaluate Young's modulus, E, and shear modulus, G, we used two different approaches to derive simple expressions for these constants in terms of just V L. The validity of such expressions was successfully put into evidence then applied to the highly porous silicon layers for which it was found that E = 1.29 GPa and G = 0.63 GPa.

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Investigation of Rayleigh wave attenuation via annular lenses in acoustic microscopy

Cited by 15 publications

References 18 publications

Study of Biomaterials Acoustic Signature Using Annular Lenses

Study of Biomaterials Acoustic Signature Using Annular Lenses

Origin and quantification of anomalous behaviour in velocity dispersion curves of stiffening layer/substrate configurations

Microacoustic evaluation of elastic parameters of highly porous silicon layers

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