Patent ID: 9494531
Filing Date: 2016-11-15
CPC Classification: G01J,G01N

Claim Text:
1. An inspection system comprising: a pulsed laser illumination source configured to generate a beam of illumination light; an optical subsystem that receives the beam of illumination light and splits the beam of illumination light into two or more secondary beams of illumination light, wherein the optical subsystem introduces a temporal delay among the two or more secondary beams of illumination light as the two or more secondary beams illuminate a surface of a specimen under inspection; and a detector operable to receive a first amount of light collected from the surface of the specimen illuminated by a first of the two or more secondary beams of illumination light, receive a second amount of light collected from the surface of the specimen illuminated by a second of the two or more secondary beams of illumination light, and generate an output value based on an integration of the first and second amounts of light for a period of time that exceeds a sum of a pulse duration of the beam of illumination light and the temporal delay.