Methods and systems for measuring base elements of a construction cylinder arrangement

A method for measuring a base element of a construction cylinder arrangement, wherein

• the construction cylinder arrangement including a base element, a piston, and a substantially cylindrical base body, is arranged on a machine for additive manufacturing of three-dimensional objects by sintering or melting a powdery material using a high-energy beam, and
• the base element can be moved by the piston in the substantially cylindrical base body of the construction cylinder arrangement,
• the method comprising
• producing a measurement pattern from laser light that illuminates at least part of the base element, wherein the measurement pattern is produced by deflection of a laser beam of a measuring laser by a scanner optical system such that differently deflected laser beams are produced and the deflected laser beams are oriented at least towards the part of the base element;
• illuminating the base element with the laser light;
• and
• monitoring sites of incidence of the laser light on the base element with a camera to produce measuring data about the base element, wherein the measuring data comprises information about a three-dimensional shape of at least a part of a surface of the base element and one or both of position information and orientation information,
• wherein the camera is arranged in a laterally offset manner in relation to the deflected laser beams, and
• wherein the measurement pattern is used to determine at least the three-dimensional shape of at least the part of the surface of the base element.