Patent ID: 7916287

Claim:
An apparatus for inspecting a substrate comprising: a movement stage for the substrate, in which a first scan is performed by rotational movement and a second scan is performed by translational movement; a pulse light irradiating unit which irradiates a first light and a second light from mutually different azimuthal angles, at substantially the same elevation angles with respect to the substrate, onto two different regions in the substrate; a detecting unit which detects lights from the two regions; a processing unit which inspects a contaminant particle or a defect of the substrate based on a detection result of the detecting unit; and a light-emitting-timing-signal generating unit which generates a first light-emitting-timing-signal for informing an emission of said first light, and a second light-emitting-timing-signal for informing an emission of said second light; wherein said detecting unit detects lights from the two regions based on said first light-emitting-timing-signal, and said second light-emitting-timing-signal.