کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1759179 1019268 2012 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Simultaneous measurement of the phase and group velocities of Lamb waves in a laser-generation based imaging method
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم آکوستیک و فرا صوت
پیش نمایش صفحه اول مقاله
Simultaneous measurement of the phase and group velocities of Lamb waves in a laser-generation based imaging method
چکیده انگلیسی

This paper describes a novel approach to the simultaneous measurement of the phase and group velocities of Lamb waves based on images of their propagation. The laser-generation based imaging method was first introduced to obtain images of Lamb wave propagation. The time series of snapshot images is used to make a position–time diagram, and the velocities can be estimated based on the slopes of the position curves. Thus, the phase and group velocities can be obtained by measuring the phase advance and energy flow of the Lamb wave, respectively. Details of the principle of simultaneous measurement are presented herein. Experimental verification was also performed in the range of 0.2–3.0 MHz-mm using aluminum plates. The average errors between experiment and theory in the phase and group velocities were 3.31% and 5.68%, respectively.


► Measurements of the phase and group velocities of Lamb waves are proposed.
► Propagation image is created by a laser ultrasonic method.
► Slope of position-time diagram is extracted from the propagation image.
► The slopes of phase advance and energy flow indicate phase and group velocities.
► Useful information along with the propagation image can be obtained.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultrasonics - Volume 52, Issue 4, April 2012, Pages 530–535
نویسندگان
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