Patent ID: 11966166
Assignee: ASML NETHERLANDS B.V.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 15:
16. A computer program product comprising a non-transitory computer-readable medium having instructions therein, the instructions, upon execution by a computer system, configured to cause the computer system to at least:
obtain alignment asymmetry data describing asymmetry in one or more alignment marks used for aligning a substrate;
obtain a model correlating alignment asymmetry data to a process parameter measurement error obtained from measurement of the substrate subject to a manufacturing process, the substrate comprising a target having a process distortion, the one or more alignment marks being separate from the target, and the process parameter measurement error being a result of the process distortion; and
use the alignment asymmetry data and the model to obtain a value of the process parameter measurement error.