Dispersion of laser generated surface waves in an epoxy-bonded layered medium

Wu, Tsung‐Tsong; Chen, Y.-C.

doi:10.1016/s0041-624x(96)00077-7

Cited by 22 publications

(13 citation statements)

References 15 publications

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“…This approach uses the dispersion curve analysis in the frequency domain. 18,19 In order to calculate the phase velocity and plot the dispersion curve, two signals containing the information of the vertical displacements of the simulated SAWs in two different locations are needed. The two receiving points for detecting these signals are located at 3 mm (arrow A in Fig.…”

Section: Simulation Results and Frequency Domain Analysismentioning

confidence: 99%

Simulation study of melanoma detection in human skin tissues by laser-generated surface acoustic waves

Chen

Dorantes-González

et al. 2014

J. Biomed. Opt

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Abstract. Air pollution has been correlated to an increasing number of cases of human skin diseases in recent years. However, the investigation of human skin tissues has received only limited attention, to the point that thereare not yet satisfactory modern detection technologies to accurately, noninvasively, and rapidly diagnose human skin at epidermis and dermis levels. In order to detect and analyze severe skin diseases such as melanoma, a finite element method (FEM) simulation study of the application of the laser-generated surface acoustic wave (LSAW) technique is developed. A three-layer human skin model is built, where LSAW's are generated and propagated, and their effects in the skin medium with melanoma are analyzed. Frequency domain analysis is used as a main tool to investigate such issues as minimum detectable size of melanoma, filtering spectra from noise and from computational irregularities, as well as on how the FEM model meshing size and computational capabilities influence the accuracy of the results. Based on the aforementioned aspects, the analysis of the signals under the scrutiny of the phase velocity dispersion curve is verified to be a reliable, a sensitive, and a promising approach for detecting and characterizing melanoma in human skin. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Section: Simulation Results and Frequency Domain Analysismentioning

confidence: 99%

Simulation study of melanoma detection in human skin tissues by laser-generated surface acoustic waves

Chen

Dorantes-González

et al. 2014

J. Biomed. Opt

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“…The theoretical dispersion curves of this study were calculated using a general-purpose computer program 12 for the calculation of the dispersion curves of isotropic as well as anisotropic layered media. The lines shown in Fig.…”

Section: B the Experimental Dispersion Curvementioning

confidence: 99%

“…1 The pulsed laser-generated Lamb waves in thin composite plates 2-7 have been employed to investigate the possible applications in the NDE of such structures. Lasergenerated ultrasonic bulk wave 8 and surface waves [9][10][11][12][13][14] have also been applied to the determination of elastic constants or defects of composite structures. The point-source/pointreceiver technique has been adopted by most of the existing studies to ensure the broadband generation of ultrasonic waves.…”

Section: Introductionmentioning

confidence: 99%

Application of narrow band laser ultrasonics to the nondestructive evaluation of thin bonding layers

Liu

Lee

2002

The Journal of the Acoustical Society of America

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In this paper, a modified laser induced grating technique (LIG) has been utilized to generate narrow band surface waves in an epoxy-bonded copper-aluminum layered structure. A high performance optical interferometer system was utilized to detect the laser-generated surface waves. The dispersion of surface wave in an epoxy-bonded copper-aluminum specimen was measured and compared with the theoretical solution. An inverse algorithm based on the simplex method was then introduced to determine the bonding thickness as well as the elastic properties of the bonding layer. The inversion results demonstrated that the thickness in the microm range or the elastic properties of the bonding layer could be successfully determined.

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“…The surface waves generated by the thermoelastic effect can be regarded as an additive superposition of elastic waves of different frequencies [2][3][4]. Their large bandwidths make it possible to accurately measure their dispersive effects [4].…”

Section: Introductionmentioning

confidence: 99%

“…Research by Wu and Liu discussed the dispersion of the laser-generated surface waves in an epoxy bonded copper-aluminium layered specimen. Their results showed that the influence of bonding layer thickness on the surface wave dispersion is clear and could be applied to the NDE of bonding properties [2].…”

Section: Introductionmentioning

confidence: 99%