Apparatus for determining the distances of points on a surface from a reference axis

摘要: An apparatus for monitoring and determining the distances of points on a surface from reference axis includes light source, such as laser, projecting main beam relatively small diameter along an axis. A device, diffraction grating, is provided splitting into plurality discrete fractional beams light. further component, diverging lens, angularly displaces relative to each other so extend common plane towards position object. Light reflected projected onto linear photodetector, positions where strike photodetector being related distance object are reflected. Preferably there gathering device converging lens system off real images thereof photodetector.