Patent ID: 9377415
Filing Date: 2016-06-28
CPC Classification: G01J,G01N,G03F

Claim Text:
1. A measuring device for measuring an illumination property of an illumination system, which is configured for two-dimensional irradiation of a substrate, arranged in an illumination plane, with illumination radiation, comprising: a spatially resolving intensity detector, two differing measurement beam paths formed in the measuring device, each of which is arranged to guide the illumination radiation emitted by the illumination system onto the intensity detector, wherein a first one of the measurement beam paths is arranged to measure an intensity distribution in the illumination plane and the second one of the measurement beam paths is arranged to measure an intensity distribution in a pupil of the illumination system, and an imaging optical unit arranged in the first measurement beam path such that the illumination radiation guided in the first measurement beam path passes through the imaging optical unit.