FOCUS ADJUSTMENT AND LASER BEAM CAUSTIC ESTIMATION VIA FREQUENCY ANALYSIS OF TIME TRACES AND 2D RASTER SCAN DATA

摘要

Methods of determining at least one parameter of an irradiation device of an apparatus for additively manufacturing three-dimensional objects may include generating an energy beam and guiding the energy beam across a structured test surface, generating a signal by detecting radiation that is emitted from the test surface, and determining the at least one parameter based on a frequency spectrum of the signal.