{"id":1298,"date":"2015-06-16T16:04:02","date_gmt":"2015-06-16T14:04:02","guid":{"rendered":"http:\/\/www.sva-potsdam.de\/particle-image-velocimetry-2\/"},"modified":"2016-06-22T09:04:15","modified_gmt":"2016-06-22T07:04:15","slug":"particle-image-velocimetry","status":"publish","type":"post","link":"https:\/\/www.sva-potsdam.de\/en\/particle-image-velocimetry\/","title":{"rendered":"PIV – Particle Image Velocimetry"},"content":{"rendered":"
\n
\n

\"piv_uboot_turm_nachstrom_pub\"<\/a><\/p>\n

\"\"<\/a><\/p>\n<\/div>\n

\nPIV is a method for measuring velocity fields in fluids. The process is purely visual and is therefore a non intrusive measurement method; the flow to be examined is not affected. The measurement of the velocity field is based on the determination of the displacement of particles (bubbles, seeding particles) in the flow by distance \u0394s within a period \u0394t. The shift \u0394s is detected by two photographic images of the particle images which are received in a very short time interval \u0394t. To this end the particles in the fluid are illuminated by very short laser flashes. From the displacement of the particle images in the period \u0394t the velocity vectors of the fluid at the position of the particles can be calculated using stochastic methods. By using two cameras with stereoscopic recording, a three-dimensional flow field can be determined, i.e., all three velocity components are then available in the measuring range.<\/p>\n

The process is very versatile. So far the following measuring tasks, among others, have been undertaken:<\/p>\n