Open AccessLow pass effect of surface defect metal based on laser ultrasonic
Author(s) -
Jingshi Wang,
Xing Xu,
Xiaojun Liu,
Xu Gang-Can
Publication year - 2008
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.57.7765
Subject(s) - materials science , ultrasonic sensor , surface (topology) , surface acoustic wave , optics , laser , acoustics , surface wave , amplitude , bandwidth (computing) , acoustic wave , filter (signal processing) , physics , telecommunications , computer science , geometry , mathematics , computer vision
The travelling properties of laser-generated surface acoustic wave with broad bandwidth, which propagated on a sample with surface defects, have been investigated in theory. The numerical results of theoretical models with different defects indicate that the surface defects worked as low-pass filter for the travelling surface acoustic waves. The cut-off frequency of low-pass filter is linearly related to the depth of the defect, and decreased against the increasing depth of the defect. The amplitude of the travelling surface acoustic wave is seriously attenuated with increasing width of surface defect. The numerical results provide a theoretical basis for quantitative detection of the surface defects.