Medida del perfil de velocidad de un líquido en un tubo de sección circular mediante un radar láser

Abstract

In this paper we present the measures of the profile or velocity gradient of a liquid (water) across a circular section pipe in laminar state, by means of a two-dimension laser radar system (2D-LDA) designed by the EEF-TSC group of UPC. The measurement instrument is build with an optical system that outputs three laser beams that are focused on the target, two acoustic-optical modulators, a set of lenses and mirrors, and two beam splitters. The dispersed signal, produced by particles introduced in the liquid, is captured by means of a set of lenses that focus it on a photodetector (APD). By means of an electronic subsystem and an acquisition and processing subsystem (in Visual C++) we obtain the results and they are compared to the theoretical model (essentially parabolic profile).