ABSTRACT
Planar Doppler velocimetry (PDV) is a flow measurement technique that provides velocity information over a plane defined by a light sheet formed from an expanded laser beam [ 1 ] , [2] . The optical frequency of light scattered from each particle in the seeded flow experiences a Doppler shift, which is linearly related to the velocity of the particle at that point in the flow. A portion of the light sheet is imaged, through a glass cell containing iodine vapour, onto the active area of a solid state camera. The laser frequency is chosen to coincide with an absorption line of iodine [3] so that the optical intensity at any position in the camera image is a function of the Doppler shift experienced at the corresponding flow position.
