Patent ID: 8786849

Claim:
A method for measuring an optical system at a measurement plane, comprising: passing a first plurality of test beams of radiation through the optical system so as to impinge on exactly one first measurement region in the measurement plane, wherein the test beams of the first plurality of test beams pass through the optical system on optical paths that differ in pairs and impinge on the first measurement region at angles of incidence that differ in pairs with respect to the measurement plane, passing a second plurality of test beams of radiation through the optical system so as to impinge on exactly one second measurement region in the measurement plane, wherein the test beams of the second plurality of test beams pass through the optical system on optical paths that differ in pairs and impinge on the second measurement region at angles of incidence that differ in pairs with respect to the measurement plane, wherein the second measurement region differs from the first measurement region, detecting at least one associated measurement value of a first test beam measurement variable at the first measurement region using a first measuring device for each test beam of the first plurality of test beams, detecting at least one associated measurement value of a second test beam measurement variable at the second measurement region using a second measuring device for each test beam of the second plurality of test beams, determining an associated impingement region on at least one reference surface of the optical system using a database for each test beam of the first plurality of test beams and of the second plurality of test beams, wherein the impingement region associated with a test beam is defined as the surface region of the at least one reference surfaceon which radiation of the respective test beam impinges, and calculating a spatial diagnosis distribution of the radiation intensity on the at least one reference surface from the measurement values and the impingement regions for each test beam.