Patent ID: 9476698
Filing Date: 2016-10-25
CPC Classification: G01B,G01N,G03F,H01L

Claim Text:
1. A method for processing and measuring a device, said device having a first periodic structure, said method comprising: measuring the first periodic structure by illuminating the first periodic structure with incident radiation and by detecting diffracted radiation from the illuminated portions of the first periodic structure; after the first periodic structure has been measured, forming a second periodic structure in a region of the device, where the first and second periodic structures are present in said region and said second periodic structure includes a first and a second portion, wherein the first portion is in the region where the first periodic structure is present and the second portion is in a second region where the first periodic structure is not present; measuring a relative position between the first and second periodic structures by illuminating the first and second periodic structures with incident radiation and by detecting diffracted radiation from the illuminated portions of the first and second periodic structures in said region; and measuring the second periodic structure by measuring said second portion of said second periodic structure in the second region.