Interferometry is a measurement technique that involves the superimposition of light waves, providing distance measurements with great accuracy. Highly accurate 3D measurements can only be made at the expense of time.

The 3D fiber optic interferometer directly measures three- dimensional distance and position with high speed and precision. The device uses light from single mode optical fibers to determine the distance between points in space. It does not require careful alignment of the fibers and can provide determination of absolute position. This device could be utilized in a number of manufacturing and robotic applications since it overcomes many of the difficulties associated with the distance between two articulating points. The device is accurate over one meter distances and would be most useful in machine shops employing large batch statistical process control manufacturing.