Vélocimétrie Doppler : mise au point d'un protocole d'essai en laboratoire et observations in situ

Doppler velocimetry: implementation of a testing procedure in laboratory and in situ observations

Laboratoire Central des Ponts et Chaussées, Division Eau, BP 4129, 44341 Bouguenais cedex - Tél. : 02-40-84-58-82, Fax : 02-40-84-59-98

Auteur de correspondance : frederique.larrarte@lcpc.fr

Abstract

The acoustic Doppler flowmeters give a global data supposed to be representative of the velocity of the flow. In order to better understand the relation between this data and the velocity, and to obtain precise flow rate measurements, it is necessary to know precisely the working characteristics of the sensors: measurements volume, balance of the acoustic echoes coming from various parts of this volume. A testing procedure has been developped to measure those parameters in a laboratory. The main goal of the interpretation of those results is to lead to a global optimisation of the setup sensor + measuring area + positionning of the sensor in the measurement area.