By G.M. Crean,M. Locatelli,J. McGilp
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FLe Carbone Lorraine. 28 sample longitudinal and shear waves at 50 MHz. These acoustic waves are reflected by the front and back surfaces of the sample, giving rise to two different echoes. The echoes are visualized on a Hewlett-Packard oscilloscope giving precise time measurements. From the sample thickness and the delay between different echoes, the longi tudinal and shear wave velocities are deduced (Fig. 1): VL=2e/AtL Vs = 2e/Ats where AtL and A*s are the propagation times of the longitudinal and shear waves respectively in the sample and e is the sample thickness.
40 Additionally, the vertical displacement of the optimized waveform in aluminium was measured at different angles relative to the acoustic axis in order to characterize the non-thermoelastic source of ultrasound by its directivity pattern. As the angle is increased, the waveform changes, mainly owing to the appearance of a head wave. The P pulse is still dominant but its amplitude decreases with increasing angle (Fig. 7). Finally, we investigated the frequency spec trum of the P pulse obtained at 70.
4. The power 39 lOOOOq 90- P [pm] 6 9 mJ Energy: 0- Power density: 26 MW/cma -90- V 180- S X / X X X* x P Amplitude + S Amplitude 270- 360- (a) 6 100 8 10 12 14 16 18 20 Time of flignt [ps] 22 24 26 1000 Power density [MW/cm2] 10000 Fig. 4. Variation of the acoustic amplitudes in aluminium as a function of incident laser power density at a constant laser energy of approximately 70 mJ. The absolute value of the S amplitude is shown. Energy: 71 mJ Power density: 134 MW/cma 800700E a. CD e 600- Energy: 152 mJ Power d e n s i t y : 396 MW/cma 500- 0)
Acoustic, Thermal Wave and Optical Characterization of Materials by G.M. Crean,M. Locatelli,J. McGilp