User:Qoru/sandbox Velocity Interferometer System for Any Reflector

A Velocity Interferometer System for Any Reflector (VISAR) is an interferometric setup with which velocities of moving surfaces of any optical quality can be measured. It was developed in 1972 at Sandia Laboratories.

Delay time between the arms of the interferometer: $$\tau=\left(2h/c\right)\left(n-1/n\right)$$

The VISAR sensitivity (as velocity per fringe shift) is given by the following formula: $$ VPF = \frac{\gamma}{2\tau\left(1+2\delta\right)}$$

Mirror displacement: $$x=h\left(1-1/n\right)$$