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ACOUSTIC PARTICLE VELOCITIES MEASUREMENT BY MEANS OF LASER DOPPLER VELOCIMETRY : APPLICATION TO HARMONIC ACOUSTIC FIELDS IN FREE SPACE WITH WEAK FLOW

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Figure

fig. 1 : Optical Set-up of LDV system
fig 2 : General signal processing
Fig. 3 : Histograms of flow velocity for an acoustic frequency fexc = 2000Hz. (A) : acoustic level equal to 80 dB SPL ; (B) : acoustic level equal to 100 dB SPL

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