A novel adaptation of the Michelson interferometer for the measurement of vibration

An adaptation of the Michelson interferometer for vibration measurement is described. Two outputs are provided, the phases of which can be independently controlled. The device provides a simple low cost solution to the problem of vibration measurement where the direction of the surface velocity is required. The relative phase of the two outputs is controlled without using any moving parts or electronic elements. The ability of the system to track vibration is demonstrated.>