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Particle Image Velocimetry - PIV

Measures whole velocity fields by taking two images shortly after each other and calculating the distance individual particles travelled within this time.

LaVision was founded in 1989 as a spin-off from Max Planck Institute and Laser Laboratory in Goettingen, Germany.

LaVision offers standard and dedicated customer designed Laser Imaging Systems for reactive and non-reactive flow field analysis and fluid mechanics applications, Intelligent Imaging Systems for non-destructive material testing, a range of high-performance cameras (CCDs and intensified CCDs) and smart optical sensor systems.

The LaVision team has extensive professional experience in Laser Imaging Spectroscopy and optical techniques such as Laser Induced Fluorescence (LIF), Absorption and Emission Spectroscopy, Raman, Rayleigh and Mie Scattering, Particle Image Velocimetry (PIV), Spray Analysis, Digital Image Correlation (DIC) techniques as well as ultra-fast time-resolved imaging and high-speed image recording.


Particle Image Velocimetry (PIV) measures whole velocity fields by taking two images shortly after each other and calculating the distance individual particles travelled within this time. From the known time difference and the measured displacement the velocity is calculated.


Since the flow can be quite fast one has to avoid blurred images and that‘s one reason to use laser pulses. They are only 6-10 ns long and freeze any motion. The other reason is that only laser light can be focused into a thin enough light sheet so that only particles in that plane are imaged. Otherwise the scattered light from particles in other planes would make this measurement impossible. A special camera is utilized so that it can store the first image (frame) fast enough to be ready for the second exposure. The "dead" time between the frames when the camera is "blind" is very short down to 100 ns.




Applications:

liquid and gas flow investigations in wind tunels, water channels, in-cylinder engines industrial flow systems, compressors, turbines, fans, pumps, Micro Electro Mechanical Systems (MEMS).

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