Apparatus for additively manufacturing three-dimensional objects

An apparatus for additively manufacturing three-dimensional objects, the apparatus comprising:

• an optical unit with at least one optical surface arranged in a process chamber of the apparatus, wherein the optical unit comprises:
• at least one determination device with at least one light source, and
• at least one determination unit adapted to determine at least one radiation parameter of radiation emitted from the light source and reflected at the optical surface of the optical unit,
• wherein the at least one determination device is adapted to determine at least one condition information of the optical unit based on the determined radiation parameter, wherein the at least one light source of the at least one determination device is at least partially integrated in a frame of the optical unit.

An apparatus for additively manufacturing three-dimensional objects, the apparatus comprising:

• an optical unit with at least one optical surface arranged in a process chamber of the apparatus, wherein the optical unit comprises:
• at least one determination device with at least one light source, and
• at least one determination unit adapted to determine at least one radiation parameter of radiation emitted from the light source and reflected at the optical surface of the optical unit,
• wherein the at least one determination device is adapted to determine at least one condition information of the optical unit based on the determined radiation parameter, wherein the at least one determination device comprises at least two light sources arranged in a predefined pattern along at least one edge of the optical unit.

A determination device for an apparatus, wherein the apparatus comprises an optical unit with at least one optical surface arranged in a process chamber, the determination device comprising:

• at least one light source;
• and
• at least one determination unit adapted to determine at least one radiation parameter of radiation emitted from the light source and reflected at the optical surface of the optical unit,
• wherein the determination device is adapted to determine at least one condition information of the optical unit based on the determined radiation parameter, and wherein the light source of the determination device is at least partially integrated in a frame of the optical unit.

A method for determining at least one condition information of an optical unit of an apparatus, wherein the apparatus comprises an optical unit with at least one optical surface arranged in a process chamber of the apparatus, the method comprising:

• determining at least one radiation parameter of radiation emitted from a light source of a determination device wherein the radiation is reflected from the optical surface of the optical unit;
• determining at least one condition information of the optical unit based on the determined radiation parameter;
• and
• at least partially integrating the light source of the determination device in a frame of the optical unit.