In 2001 I worked on spectral analysis of a jet-type flow and realized a PIV software with matlab. Of course images that I used issued from a high speed camera, have nothing to do with the 40 billion frames per second we are talking about here ! It was just fascinating to see the particles moving in milliseconds.
We are talking here about 40 Cycles Per Nanosecond !! It's not just fascinating, it's Hilariously crazy !