PDA - Phase Doppler Anemometry

Our phase Doppler anemometry (PDA) systems measure the size, velocity and concentration of spherical particles, droplets or bubbles suspended in gaseous or liquid flows.

The PDA is also known as phase Doppler particle analyzer (PDPA) and phase Doppler interferometer (PDI). The Phase Doppler particle analyzer is an extension of the laser Doppler velocimeter.

The transmission optics portion is identical to the transmission optics of an LDV, so all three velocity components can be measured, as well as particle size. Simultaneous particle velocity and diameter data are essential for understanding the dynamics of spray nozzles and fuel injectors or the formation of cavitation nuclei.

Common applications: analysis of atomized liquids (aerosols), fuel injection, spray painting, pharmaceutical and agricultural aerosol studies...