Abstract：
:This paper describes a laser optical technique for the detection of in-plane (IP) motion of ultrasonic waves propagating in solids. This interference-based laser optical technique includes a tiny square indentation with a width of about 30 microm on the sample surface and a relatively simple optical arrangement. The current technique is applied for the detection of in-plane motions of Lamb waves propagating in a thin brass plate. Measurement of S(0) mode dominated by in-plane motion in the low fd (frequency times thickness) regime is successfully demonstrated with the current technique. The newly proposed non-contact technique provides an alternative other than the heterodyne and Fabry-Perot techniques for the detection of IP motions with a relatively simple optical arrangement. This technique is not readily applicable to general NDE applications, where a position scan or an arbitrary selection of inspection location is needed. However, this technique can be useful in the areas such as fixed-position ultrasound monitoring or laboratory research activities involving optical detection of IP motion.
journal_name
Ultrasonicsjournal_title
Ultrasonicsauthors
Yang CH,Tsai YCdoi
10.1016/j.ultras.2006.05.076subject
Has Abstractpub_date
2006-12-22 00:00:00pages
e1239-42eissn
0041-624Xissn
1874-9968pii
S0041-624X(06)00110-7journal_volume
44 Suppl 1pub_type
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