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Stereoscopic PIV is used to obtain the three-component velocity field in the planar region illuminated by a laser light sheet. The fundamental principle behind 3-D PIV is stereoscopic imaging of particles in an illuminated plane in the flow. Two cameras view the plane at different angles and capture particle displacement images that contain the influence of the third velocity component. Innovative data reduction provides the true particle displacements and on-line 3-D velocity vector field display.