Motion-measuring system of a machine and method for operating the motion-measuring system

A method for operating a motion-measuring system of a machine, in particular of a coordinate measuring machine or of a machine tool, wherein:

• an image recording device arranged on a first part of the machine captures a spatial radiation distribution on the basis of radiation emanating from a second part of the machine and records at least one corresponding recording image of the second part,
• the first part and the second part are movable relative to one another,
• a capturing structure, which is formed by the second part and/or which is arranged on the second part, is captured by the at least one recording image,
• using information about an actual appearance of the capturing structure in a motionless state, a speed of the relative movement of the first part and the second part is determined from differences between the at least one recording image and the actual appearance of the capturing structure,
• the differences arise as a result of a temporal profile of the spatial radiation distribution within a recording time interval of a respective recording image during a relative movement of the first part and the second part, and
• the capturing structure is a structure whose position function transformed into the frequency domain has function values greater than zero within a frequency range that begins at a frequency greater than zero and that ends at a predefined maximum frequency.

In a method for operating a motion-measuring system of a machine, in particular of a coordinate measuring machine or of a machine tool, wherein:

• an image recording device arranged on a first part of the machine captures a spatial radiation distribution on the basis of radiation emanating from a second part of the machine and records at least one corresponding recording image of the second part,
• the first part and the second part are movable relative to one another,
• a capturing structure, which is formed by the second part and/or which is arranged on the second part, is captured by the at least one recording image,
• using information about an actual appearance of the capturing structure in a motionless state, a speed of the relative movement of the first part and the second part is determined from differences between the at least one recording image and the actual appearance of the capturing structure, and
• the differences arise as a result of a temporal profile of the spatial radiation distribution within a recording time interval of a respective recording image during a relative movement of the first part and the second part;
• a method for producing the capturing structure which is usable or is used in the method for operating the motion-measuring system of the machine,
• wherein dimensions of structure elements of the capturing structure are chosen depending on a magnitude of an expected speed of the relative movement of the first part and of the second part of the machine.