Abstract：
:This paper presents a new method of measuring dispersion curves of leaky Lamb waves propagating in a thin plate. The measurement system is based on a lens-less line-focus transducer and its defocusing measurement technique. A new waveform processing method known as V(f, z) method is introduced for analyzing the measured waveforms and for extracting the dispersion relation. For two thin-plate samples, namely a 150 microm thick alumina plate and a 320 microm thick stainless steel plate, the dispersion curves of several lower order modes of leaky Lamb waves have been experimentally determined in the frequency range of few to 25 MHz. The experimental dispersion curves have then been compared with the theoretical ones. Excellent agreement is observed. It is then verify that this method indeed provides a convenient and accurate way for experimentally measuring dispersion curves of leaky Lamb waves of thin-plate samples.
journal_name
Ultrasonicsjournal_title
Ultrasonicsauthors
Lee YCdoi
10.1016/s0041-624x(00)00069-xsubject
Has Abstractpub_date
2001-06-01 00:00:00pages
297-306issue
4eissn
0041-624Xissn
1874-9968pii
S0041624X0000069Xjournal_volume
39pub_type
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