Abstract
Planar Doppler Velocimetry (PDV) has typically been applied using pulsed lasers, for which the limiting factor on velocity resolution is speckle noise. The present work demonstrates improvements in velocity resolution obtained by using a continuous wave (cw) laser instead, enabling the speckle noise to be averaged out. Measurements are made in a seeded laminar jet using PDV with a cw laser, and are compared to measurements of the same jet using the more established technique of Particle Imaging Velocimetry (PIV). The PDV results demonstrate a velocity resolution of 0.13 m/s, which was near the photonstatistical shot noise limit for this experiment. The velocity field obtained shows good agreement with the PIV results.
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