Particle Image Velocimetry (PIV)

Equipment/facility: Equipment

    Description

    In Particle Image Velocimetry (PIV) light scattering particles are added to the flow. A laser beam is formed into a light sheet illuminating seeding particles twice with a short time interval Δt. In 2D-PIV the scattered light is recorded onto two consecutive frames of a high resolution digital camera. In Stereo-PIV two cameras at different observation angles are used to measure also the third (out-of-plane) component of the flow velocity in the light sheet.
    For velocity calculation the particle image of each camera is subdivided into small interrogation windows. The average particle displacement within an interrogation window is determined by cross-correlation followed by the localization of the correlation peak. From the known time difference Δt and the measured displacement in each direction the velocity components are calculated. Perspective correction, distortion compensation and image mapping of the two views are taken care of by Self-Calibration procedures. Advanced multi-pass image deformation techniques are used for higher accuracy and spatial resolution.
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