Tomographic Particle Image Velocimetry (Tomo-PIV) with the LaVision Flow Master system provides volumetric measurements of particle or droplet velocities. A thick laser sheet is used to illuminate the particles within a wedge of the spray. With three cameras capturing the scattered light from multiple viewpoints, the components of speed and direction can be determined in three dimensions.
The thick laser sheet is typically aligned so that the primary velocity component is in-line with the nozzle axis. Typically, many instantaneous velocity fields are determined and used to generate an ensemble average 3D velocity field. The simultaneous capture of 3D velocities across a spray-plane is a unique capability of this non-intrusive measurement method, and can be very useful in applications where the spray interacts with a target or a moving gas stream and for CFD validation purposes.