A device for determining the profile of a surface is disclosed. It comprises a beam arranged in a rotating plane about an axis of rotation, forming on the surface a light spot and scanning a sector of that plane. A detection system whose detection axis is situated in that plane cuts the beam near the...http://www.google.de/patents/US3967114?utm_source=gb-gplus-sharePatent US3967114 - Device for determining the profile of a surface
