Patent ID: 7990530

Claim:
An inspection apparatus for inspecting an anomaly of a substrate, the apparatus comprising: a moving unit for moving the substrate; an illumination unit for emitting first and second optical beams, the illumination unit including a pulse light source for generating a plurality of illumination areas on the substrate, the illumination areas being formed in relation to a moving direction of the moving unit; a first photo-detector arranged in an optical path of the first optical beam emitted from the illumination unit, the first photo-detector configured to output a first illumination timing signal; a second photo-detector arranged in an optical path of the second optical beam emitted from the illumination unit, the second photo-detector configured to output a second illumination timing signal; a detection unit for detecting scattered light from the substrate, wherein the detection unit isolates outputs of the illumination areas from each other based on the first illumination timing signal and the second illumination timing signal; and a processing unit configured to determine the anomaly based on the isolated outputs.