Method for additively manufacturing of three-dimensional objects

A measuring device for an apparatus for additively producing three-dimensional objects, wherein:

• the measuring device is assignable or assigned to an exposure device configured to produce an energy beam for successive layer-by-layer selective exposure and successive layer-by-layer selective solidification of construction material layers made of a construction material that can be solidified by means of the energy beam;
• the measuring device is configured to measure the power of the energy beam that is produced by the exposure device;
• the measuring device or an adapter device that bears the measuring device is holdable with defined spatial positioning relative to a reference point of the apparatus by a holding device, wherein the holding device is arrangeable or arranged in a construction plane of the apparatus and comprises a plurality of defined holding positions;
• and
• the measuring device comprises a measuring element that comprises an energy beam input face and an energy beam widening device that is disposed or embodied to be upstream of the energy beam input face, wherein the energy beam widening device is configured to widen the energy beam that is to be measured in view of its power.

A method for measuring the power of an energy beam of an exposure device of an apparatus for additively producing three-dimensional objects, the method comprising:

• producing, with an exposure device, an energy beam for successive layer-by-layer selective exposure and successive layer-by-layer selective solidification of construction material layers made of a construction material that can be solidified by means of the energy beam;
• arranging a holding device in a construction plane of the apparatus, the holding device comprising a plurality of defined holding positions,
• holding, with the holding device, the measuring device or an adapter device that bears the measuring device with defined spatial positioning relative to a reference point of the apparatus;
• widening, with an energy beam widening device that is disposed or embodied to be upstream of an energy beam input face, the energy beam;
• and
• measuring, with a measuring element, the energy beam in view of its power.