A measurement technique to obtain dispersion curves for guided acoustic modes in laminated plate-like materials is described. The measurement is performed by means of two angled ultrasonic longitudinal transducers positioned on the plate surface with dry contact coupling, in a pitch catch configuration. Dry contact coupling ensures higher signal to noise ratios than immersion techniques. The excitation signal of the transmitting transducer is a wide band pulse. Thus all the frequencies contained in the pulse-band are simultaneously used to excite the guided modes.
Fort, A., Vignoli, V. (1999). Laminar material characterization by ultrasonic wide-band measurements of Lamb waves disperison curves. ALTA FREQUENZA - RIVISTA DI ELETTRONICA, 11, 52-55.
Laminar material characterization by ultrasonic wide-band measurements of Lamb waves disperison curves
FORT, ADA;VIGNOLI, VALERIO
1999-01-01
Abstract
A measurement technique to obtain dispersion curves for guided acoustic modes in laminated plate-like materials is described. The measurement is performed by means of two angled ultrasonic longitudinal transducers positioned on the plate surface with dry contact coupling, in a pitch catch configuration. Dry contact coupling ensures higher signal to noise ratios than immersion techniques. The excitation signal of the transmitting transducer is a wide band pulse. Thus all the frequencies contained in the pulse-band are simultaneously used to excite the guided modes.
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https://hdl.handle.net/11365/33159
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