Patent ID: 11886125
Assignee: ASML NETHERLANDS B.V.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 14:
15. A computer program product comprising a non-transitory machine-readable medium comprising machine readable instructions therein, the instructions, upon execution by a computer system, configured to cause the computer system to at least:
obtain intensity data comprising an intensity image relating to at least one diffraction order obtained from a measurement on a target;
obtain at least one intensity statistical distribution from the intensity image;
determine, from the at least one intensity statistical distribution, an intensity indicator expressing a variation of either intensity over the at least one diffraction order, or a difference in intensity between two complimentary diffraction orders over the intensity image; and
infer a value for at least one local uniformity metric relating to a product structure from the intensity indicator.