Sterolithographic beam profiling

Details Sterolithographic beam profiling Sterolithographic beam profiling

G - Physics

01

J

73/51, 341/97

G01J 1/42 (2006.01) B23K 26/00 (2006.01) B29C 39/42 (2006.01) B32B 1/10 (1995.01)

Patent

CA 1340501

An apparatus and a method for profiling the intensity of a beam and thus measuring the overall intensity and power of a beam are disclosed that have particular use in stereolithography. A beam sensor comprising a pinhole in a plate and a photodetector behind the pinhole measures the intensity of portions of a beam as the beam is moved over the beam sensor. Software associated with the sensors in a computer controls the scanning mechanism for the beam so that the beam is shifted to find the pinhole and move across it in order to develop the intensity profile. The invention can be used to detect drift in the scanning mechanism, determine the focus of the beam, and predict the depth and width of photopolymer cured by the beam. A related apparatus and method for calibrating and normalizing a stereolithographic apparatus is described, and a related apparatus and method for correcting for drift in production of objects by stereolithography, is also described.

616962

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