plate wave

plate wave

[′plāt ‚wāv]
(acoustics)
A type of ultrasonic vibration generated in a thin solid, such as a sheet of metal having a thickness of less than one wavelength, and usually consisting of a variety of simultaneous modes having different velocities; it is used in metal inspection. Also known as Lamb wave.
References in periodicals archive ?
Anttila, "On the verification of the applicability of the orthotropic plate wave theory to paper", Ultrasonics, vol.
This method involves acoustically coupling a transducer to a porous film, producing a plate wave in the porous film and generating a signal characteristic of the film.
The symmetrical or extensional plate wave velocities are independent of frequency, i.
Since the publication of [1], many articles by different workers have been published under various titles such as plate wave AE [2, 3], wideband AE, waveform-based AE [4, 5], guided wave AE or wave-based AE as can easily be seen by doing a web search using these key words.
Because of this mismatch in mode velocities the signal produced, when a sensor detects an elastic plate wave originating from an acoustic emission, will comprise of two distinct components.
Wevers, "One sensor linear location of acoustic emission events using plate wave theories," Materials Science and Engineering, A265, 254-261, 1999.
Another aspect of plate wave calibration is the orientation dependence.
The thickness of the vessels and the frequency range of the AE sensors resulted in the consideration of the principal plate wave modes [S.
However, special techniques are required for thin structures due to the dispersive nature of plate wave AE.
That means the main direction of source movement stimulates a preferred plate wave mode.
In sections on acoustic waves in sonic crystals, elastic waves in phononic crystals, and wave phenomena in phononic crystals, he considers such topics as scalar waves in periodic media, sonic crystals, phononic crystals for surface and plate waves, coupling acoustic and elastic waves in phononic crystals, evanescent Bloch waves, and spatial and temporal dispersion.
Other standards like EN 13477 [3] and ASTM E976 [4] are general and do not consider the fact that plate waves propagate in different modes.