I didn’t think about it that much, but I did not have a clue what “laser scanning vibrometry” was going to be about, but now that I visited the Wikipedia page it makes perfect sense. These are laser scanners that capture vibrations which of course are critical to understand in the fields of automotive, medical, aerospace, micro system and information technology as well as for quality and production control.
The operating principle is based on the Doppler effect, which occurs when light is back-scattered from a vibrating surface. Both velocity and displacement can be determined by analyzing the optical signals in different ways. It’s a new one to me.