PDPA system:
The Phase Doppler Technique is a laser-based interferometric approach for
simultaneously measuring particle size, concentration, and velocity. This
laser-based method is similar to the well-known laser Doppler velocimetry
(LDV) and can make these measurements non-intrusively and with high
accuracy. The Phase Doppler Particle Analyzer (PDPA) has been successfully
applied to many difficult two-phase flow environments with spherical
particles including gas-turbine and rocket fuel injection, cavitation and
bubble formation, and similar two-phase flows.