New Generation of Phase‐Doppler Instruments for particle velocity, size and concentration measurements

Phase‐Doppler anemometry (PDA) is applied for particle size, velocity and concentration measurements in two‐phase or multi‐phase flows of ever increasing complexity. For accurate measurements the experimenter must be provided with software and hardware which permit an optimal layout of the PDA optics for a given application, reliable detection of signals over a wide particle diameter range, accurate determination of particle concentration and precise discrimination between particles of different composition. Recent work at LSTM, Erlangen, has been directed to developing a complete PDA package for the above purposes. Progress in this direction is summarized in this paper.