Surface Pattern Image Velocimetry

Surface Pattern Image Velocimetry (German: surface pattern speed measurement from images ) is a non-contact optical measuring method for determining speed fields in fluid mechanics . In contrast to Particle Image Velocimetry , a volume is not examined here, but only the movement of the interface between two fluids flowing into one another .

principle

Two successive images are compared from a video film of the flowing interface. The determination of the speed components in the image plane is achieved by calculating the cross-correlation function between adjacent image areas in both images. The camera can be calibrated using the methods of photogrammetry so that the movement can be converted from the image coordinates into spatial coordinates.

Application example

One possible application of Surface Pattern Image Velocimetry are injection processes like those in internal combustion engines .