کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1759888 | 1523219 | 2008 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Diffraction of picosecond bulk longitudinal and shear waves in micron thick films; Application to their nondestructive evaluation
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
آکوستیک و فرا صوت
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Diffraction of picosecond bulk longitudinal and shear waves in micron thick films; Application to their nondestructive evaluation Diffraction of picosecond bulk longitudinal and shear waves in micron thick films; Application to their nondestructive evaluation](/preview/png/1759888.png)
چکیده انگلیسی
In this paper, acute focusing of the laser pump beam (≈0.5 μm) on the sample surface allows picosecond acoustic diffraction in thin metallic films. The resulting wavefronts propagate at a group velocity which differs from phase velocities in anisotropic films. Waveforms have been experimentally recorded in a gold layer (2.1 μm thick) for several distances between pump and probe on the sample surface. A specified signal processing based on a Synthetic Focalization Technique allows analyzing the space repartition of the acoustic wave vectors for both longitudinal and shear waves. Stiffness coefficients of the gold layer are then identified from wave arrival times.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultrasonics - Volume 48, Issues 6–7, November 2008, Pages 574–577
Journal: Ultrasonics - Volume 48, Issues 6–7, November 2008, Pages 574–577
نویسندگان
B. Audoin, M. Perton, N. Chigarev, C. Rossignol,