Patent ID: 11878365
Assignee: CONCEPT LASER GMBH
Field: Other special machines (Mechanical engineering)
Classification: CPC B  Y | IPC B

Claim 13:
14. A determination device for determining at least one irradiation parameter of an irradiation device of an apparatus for additively manufacturing three-dimensional objects by successive layerwise selective irradiation and consolidation of layers of a build material which can be consolidated by an energy beam, the determination device is adapted to:
generate the energy beam and guide the energy beam across a structured test surface;
generate a signal by detecting radiation emitted, reflected, or scattered, from the structured test surface;
perform a Fourier transformation of the signal;
determine at least one of a frequency spectrum of a time trace of the transformed signal or a frequency spectrum of a two-dimensional distribution of the transformed signal; and
determine the at least one irradiation parameter based on at least one of the determined frequency spectrums;
wherein the at least one irradiation parameter is or relates to a focus position of the energy beam, or a caustic of the energy beam for at least one position relative to a build plane, and
wherein the focus position is determined based on the frequency spectrum of the time trace of the signal, or a beam width is determined based on the frequency spectrum of the two-dimensional distribution of the signal.