On calibrating large-scale volumetric flow measurement experiments

Performing 3D measurements in extended volumes comes along with several experimental challenges, especially when aiming for highly resolved results. Most of these are connected to achieving a sub-pixel-accurate volumetric camera calibration, which is imperative for methods like Shake-The-Box (STB). We report about an experiment to measure the flowfield in a typical classroom within a volume of 55 m3, populated by sitting heated mannequins and seeded by Helium-filled soap bubbles, illuminated by arrays of pulsed LEDs and recorded by eight 65 MPx-cameras, installed above the transparent ceiling. ISFV21-1264