The technique builds on a piece of technology developed for the study of mechanical vibration; the laser vibrometer, and relies on a phenomenon called the acousto-optic effect. This describes the slight change in the speed of light in air when it passes through an acoustic field, causing a phase shift in the light that can be detected using the vibrometer.
The construction of the walls of that studio is baffling.
very baffling – lol
I thought this would be a whole lot more titillating.