Patent ID: 8760666

Claim:
A method for measuring spacings between optical surfaces of an optical system, comprising the following steps: a) detecting a centring state of the optical system by directing a test-light ray, which propagates along a reference axis, onto the optical system, and detecting a location, at which the test-light ray impinges onto a location-resolving optical sensor, after it has passed completely through the optical system, so that all optical surfaces inside the optical system are taken into consideration; b) adjusting the optical system, taking into consideration the centring state detected in step a); c) transilluminating the optical system with a measuring-light ray which propagates along the reference axis; d) superimposing portions of the measuring-light ray that were reflected from the optical surfaces with a reference-light ray in an interferometer; e) determining the spacings between the optical surfaces along the reference axis by detecting and evaluating interference phenomena between the reflected portions and the reference-light ray.