An optical image spitter system splits the camera view into several sub views, typically we use four. These sub views each have different viewing angles onto the observation domain. This results in several virtual viewing points, thus allowing for stereoscopic imaging with just one single camera.
Sometimes you either do not have the money to spend on several cameras, or you do not have the space to squeeze four 5kg cameras in front of your tiny flow setup. Then it is time to use an image splitter system like it is used in IfU at ETH Zurich, in the Turbulence Structure Laboratory in Tel Aviv University, or in the St. Anthony Falls Laboratories , University of Minnesota.
Of the shelf a complete system can be purchased via photrack Ltd for the price of separate parts, integration and transport. The mirror setup is shown and you can order the parts on your own, directly from Linos, and likely slightly cheaper. The pyramid drawings are also available from photrack Ltd. The software will require some adaptations and fine tuning that are available from the same source.