Abstract
The velocity profiles measured with a recently built ultrasonic velocity profile (UVP) sensor based on ultrasound (US) pulsed echography are compared with laser Doppler velocimetry (LDV) measurements. The results from the experiments show that both techniques are well suited to measurements in oscillating, piston-driven pipe-flows. LDV has a higher spatial resolution in the region of high-velocity gradients, but requires considerably greater effort to obtain a complete velocity profile than the UVP sensor, which can obtain the complete profile information simultaneously. However, in the near-wall regions, reflections of the US beam degrade the quality of the UVP measurements. This problem may be reduced by matching the wall material and the fluid so as to minimize the difference in the propagation speed of acoustic waves in both media.
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