Developed by Phase Laser Systems Inc., this technique makes innovative use of differential phase measurement technology.
Light travels in a straight line.
This property makes feasible a variety of possible geometric methods for measuring distance, most of which depend on some form of triangulation. These methods are limited in that they require at least two spatially separate reference points. Laser light is coherent. The technique, however, is not easily usable for greater distances. Light propagates through space with a very well-known velocity.