Patent ID: 8629902
Filing Date: 2014-01-14
Classification: G01N,G06T

Abstract:
1. A system, comprising: a support configured to rotatably support a wafer; an imager for generating an image by scanning a first region on an edge of a wafer, a second region on a first side of the wafer proximal to the edge of the wafer, and a third region on a second side of the wafer proximal to the edge of the wafer, where the image includes a first coordinate reference; a profiler for generating an edge shadow profile in a Z-direction including an apex of the edge, the profile generated by projecting at least nominally collimated light in a direction at least substantially parallel to the first side of the wafer and the second side of the wafer, the at least nominally collimated light projected past the edge of the wafer, where the profile includes a second coordinate reference; and control programming for locating at least one structural feature of the edge of the wafer recognizable by both the imager and the profiler for allowing the first coordinate reference to be mapped to the second coordinate reference.