Patent ID: 11948293
Assignee: CARL ZEISS INDUSTRIELLE MESSETECHNIK GMBH
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 7:
8. An arrangement for determining a position of an object, the arrangement comprising:
at least one capture structure arrangeable at the object or at a reference object captured from the object;
a capturing device configured to optically capture the at least one capture structure and to thereby obtain capture information;
the at least one capture structure having a point-symmetrical profile of an optical property that varies along a surface of the at least one capture structure;
an evaluation device, wherein the evaluation device and/or the capturing device are/is configured to generate a location-dependent mathematical function corresponding to the point-symmetrical profile of the optical property that is captured with the capture information; and
the evaluation device being configured to:
transform the location-dependent mathematical function into a frequency domain, such that a first frequency-dependent mathematical function is obtained,
form a second frequency-dependent mathematical function from the first frequency-dependent mathematical function, wherein the second frequency-dependent mathematical function is formed from a relationship of in each case a real part and an imaginary part of complex function values of the first frequency-dependent mathematical function,
form at least one function value of the second frequency-dependent mathematical function and to determine it as location information about a location of a point of symmetry of the location-dependent mathematical function,
determine the position of the object based on the location information, and
control a movement of a movable part of a machine arrangement based on the position of the object.