LAVISION FLOWMASTER PIV SYS

The FlowMaster system family is designed to measure instantaneous 2D- and 3D velocity
fields using the well-established Particle Image Velocimetry (PIV) technique. The different types are measurements on a plane/sheet (2D and Stereo-PIV) and in a volume (Tomo-PIV).While 2D-PIV measures both components on a plane, Stereo-PIV measures also the out-of-plane component on a plane. Tomo-PIV measures all three vector components in a volume. For all types the measurements can be performed at either low frame rate ("Low-Speed"-PIV) or at several kHz ("Time-Resolved"-PIV).

The flow is seeded with small particles which follow the flow. Typically a pulsed laser
beam is formed into a light sheet and is fired twice with a short time delay dt. Both
illuminations are recorded by a double-frame high resolution CCD camera.
The recorded image is divided into small interrogation windows typically 64 x 64 down
to 16 x 16 pixels in size. During the time interval dt between the laser shots the particles
of each interrogation window have moved by a displacement ds. The velocity is then
simply given by the ratio ds/dt. The calculation of the particle displacement ds is done
by fast FFT-based cross-correlation of two corresponding interrogation windows.