Patent ID: 6858836

Claim:
A laser scanner measuring system for measuring macroscopic geometric parameters of an object, the macroscopic geometric parameters including at least one of contour, size and wall thickness of the object, the system comprising: an emitter unit having a laser, a beam deflector unit and an optical emitter system which define a scanning beam path and a scanning plane of a scanning beam emitted from said emitter unit; a receiver unit including a photo detector disposed in the focal plane of an optical receiver system in a path of a receiver beam, wherein the surface normal of said optical receiver system is parallel with the scanning beam path, the receiver unit receiving said receiver beam after scanning the object and generating a signal; a dark field stop disposed ahead of said photo detector in the receiver beam path in the focal plane of said optical receiver system where the dark field stop is arranged to block a central beam in the receiver beam path; a beam splitter ahead of said dark field stop for splitting a partial beam from the receiver beam path, said photo detector including a photo diode arranged in said partial beam, said photo diode being disposed approximately in the focal point of said optical receiver system; and an electronic analyzing system for determining the macroscopic geometric parameters from the signal.