Patent ID: 9518930
Filing Date: 2016-12-13
CPC Classification: G01N,G06T,Y10T

Claim Text:
1. An optical collection and detection system for use in a surface inspection system for inspecting a surface of a workpiece, the surface inspection system having an incident beam projected through a back quartersphere and toward a desired location on the surface comprising an scanned spot having a known scanned spot size, the incident beam impinging on the surface to create scattered light that is collected by a collector module, the collector module comprising: collection optics for collecting and focusing the scattered light to form focused scattered light; a collector output slit positioned at an output of the collector module and through which the collection optics focus the scattered light, with scattered light associated with the scanned spot forming an imaged spot at the collector output slit; the collector output slit having a width that is selected to be proportional to the scanned spot size to allow passage of the focused scattered light associated with the scanned spot but to exclude the focused scattered light associated with the workpiece regions other than the desired spot; at least one of the collector output slit width and side-to-side position disposed so as to minimize passage of Rayleigh light scatter through the collector output slit.