Numerical modeling of thermoelastic generation of ultrasound by laser irradiation in the coupled thermoelasticity

Veres, István A.; Berer, Thomas; Burgholzer, Peter

doi:10.1016/j.ultras.2012.05.001

Cited by 38 publications

(21 citation statements)

References 34 publications

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“…45,50 For small laser pulse energy, below the ablation regime, sudden thermal expansion of the surface of a material generates elastic waves. 45,48,49,[51][52][53][54][55][56] Here, considering the two generation mechanisms, elastic wave energy is discussed for point normal loading and dipole loading, as shown in Fig. 4.…”

Section: Relationship Between Source Position and Energy Generatedmentioning

confidence: 99%

Vibration energy analysis of a plate for defect imaging with a scanning laser source technique

Hayashi

Fukuyama

2016

The Journal of the Acoustical Society of America

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Vibration energies generated by laser irradiation to a plate with a crack were calculated by the semi-analytical finite element method to elucidate the principle of defect imaging using a scanning laser source. For normal incidence in the ablation regime, the incident energy increases when the incident source is located in the vicinity of the crack, owing to the effect of the non-propagating A1 modes. For dipole loading in the thermoelastic regime, the vibration energies are completely different, depending on the position of the crack opening. If the crack opening is located opposite the incident source, the vibration energy increases abruptly in the vicinity of the crack, which is affected by the higher-order non-propagating modes as well as the A1 modes. When the crack opening and the incident source are located on the same side, the generated energy approaches zero as the source moves closer to the crack. The energy reduction around the crack is caused by the superposition of the incident wave from dipole loading and the phase-inverted reflected wave. The results of experiments conducted to verify the energy variations in the vicinity of a crack were in good agreement with the numerical results for dipole loading.

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Section: Relationship Between Source Position and Energy Generatedmentioning

confidence: 99%

Vibration energy analysis of a plate for defect imaging with a scanning laser source technique

Hayashi

Fukuyama

2016

The Journal of the Acoustical Society of America

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“…[1][2][3][4] The udkm1Dsim toolbox is a collection of classes and routines to model 1D crystalline sample structures on the atomic level and to simulate incoherent (heat diffusion) as well as coherent lattice dynamics (acoustic phonons) by semi-coupled equations of thermoelasticity. [5,6] The resulting transient X-ray diffraction response for the 1D sample structure is computed by dynamical X-ray theory. [7,8] Due to the high modularity of the toolbox it is easy to introduce user-defined procedures in between the simulation steps.…”

Section: Introductionmentioning

confidence: 99%

udkm1Dsim—A simulation toolkit for 1D ultrafast dynamics in condensed matter

Schick

Bojahr

Herzog

et al. 2014

Computer Physics Communications

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The udkm1Dsim toolbox is a collection of matlab (MathWorks Inc.) classes and routines to simulate the structural dynamics and the according X-ray diffraction response in one-dimensional crystalline sample structures upon an arbitrary time-dependent external stimulus, e.g. an ultrashort laser pulse. The toolbox provides the capabilities to define arbitrary layered structures on the atomic level including a rich database of corresponding element-specific physical properties. The excitation of ultrafast dynamics is represented by an N -temperature model which is commonly applied for ultrafast optical excitations. Structural dynamics due to thermal stress are calculated by a linear-chain model of masses and springs. The resulting X-ray diffraction response is computed by dynamical X-ray theory. The udkm1Dsim toolbox is highly modular and allows for introducing user-defined results at any step in the simulation procedure.

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“…The main advantage of this discretization is that it requires only the first spatial derivatives to be discretized in the wave equation [11], [12], [13]. Due to the symmetry of the problem only one half of the area is modeled using symmetric boundary conditions with stress free boundary conditions to the wave equations and adiabatic boundary condition to the heat conduction equation [11].…”

Section: Numerical Simulationsmentioning

confidence: 99%

Direct measurement of SAW dispersion relations in the k-ω domains; numerical and experimental studies

Veres

Grünsteidl

Roither

et al. 2013

2013 IEEE International Ultrasonics Symposium (IUS)

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We evaluate the dispersion relation of surface acoustic waves by temporally and spatially modulated laserultrasound in the presented work. Experimental data are acquired by the combined application of intensity modulated laserdiodes and a spatial light modulator. Numerical simulations obtained from the solution of the coupled heat and wave equations using the finite difference time domain method with a combination of implicit and explicit temporal integration techniques.

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Numerical modeling of thermoelastic generation of ultrasound by laser irradiation in the coupled thermoelasticity

Cited by 38 publications

References 34 publications

Vibration energy analysis of a plate for defect imaging with a scanning laser source technique

Vibration energy analysis of a plate for defect imaging with a scanning laser source technique

udkm1Dsim—A simulation toolkit for 1D ultrafast dynamics in condensed matter

Direct measurement of SAW dispersion relations in the k-ω domains; numerical and experimental studies

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