A group of mechanical engineers at the University of Minnesota recently managed to record infrasound visually. By placing a search light next to a wind turbine, with falling snow acting as a screen, it is possible to SEE the footprints of infrasound generated by each turbine blade as it passes in front of the tower. The pulsations are recorded, like footsteps in the snow.
Particle Image Velocimetry is a technique to measure turbulence long used in wind tunnels for small scale testing. Using this technique to measure turbulence in the field on full-scale structures has proved to be very difficult and has been thought by some to be impossible. In February 2013, Eolos researchers demonstrated the ability to visualize large scale turbulent structures using natural snowfall. This allows you to see what for years the industry has denied.