16 November 2010 Simulation of laser ultrasonic for confirming the initial time and location during the generation phase
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Process of laser ultrasonic generation was simulated in detail for confirming the exact time and location ultrasonic produced. The particular generating information in thin-film could help to accurately analyze the ultrasonic characteristics, especially in high pressure physics. Numerical models based on the two-dimensional axis-symmetry was built in cylinder coordinate system and calculated by finite element method (FEM). The duration and penetration-depth of pulse laser were considered instead of point approximation. In addition, parameters of material were set as functions related with temperature. According to the results, strain energy accumulated below the incidence point, so that the maximum amplitude of ultrasonic wave appeared few distances inside of the sample. Non-negligible errors were caused by that distances in velocity calculation. Without amendment, the errors increased with the broadening of pulse width and decreased with the growth of propagation distance. Therefore, the time ultrasonic generated should be fixed a head of the time that laser peak arrived. Furthermore, wave shape were easy to distinguish but inaccurately while the sample were covered with a transparent window.
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Wei Liao, Dexing Yang, Wen Feng, "Simulation of laser ultrasonic for confirming the initial time and location during the generation phase", Proc. SPIE 7843, High-Power Lasers and Applications V, 78430I (16 November 2010); doi: 10.1117/12.868935; https://doi.org/10.1117/12.868935

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