Measurement of the positions of centres of curvature of optical surfaces of a multi-lens optical system

An apparatus for measuring the positions of centres of curvature of optical surfaces of a multi-lens optical system, comprising:

• a) an interferometer that is configured to measure spacings between the optical surfaces along a reference axis;
• b) an optical angle-measuring device that is configured to measure positions of the centres of curvature of the optical surfaces,
• c) a computing unit which is configured to take into consideration computationally, when measuring the position of the centre of curvature of an optical surface situated within the optical system,
• the measured positions of the centres of curvature of the optical surfaces situated between this optical surface and the angle-measuring device and
• the spacings between the optical surfaces measured by the interferometer.

A method for measuring positions of centres of curvature of optical surfaces of a multi-lens optical system, comprising the following steps:

• a) provisionally determining an optical axis of the optical system, wherein test light is coupled in from one side of the optical system, and on an opposite side test light emanating from the optical system is detected by a location-resolved light-sensor;
• b) the optical system and an interferometer are oriented with respect to one another in such a way that the optical axis provisionally determined in step b) is aligned with a reference axis;
• c) measuring spacings between the surfaces along the reference axis using an interferometer;
• d) measuring again the positions of the centres of curvature of the surfaces using the optical angle-measuring device, whereby in the course of a measurement of the centre of curvature of a surface situated within the optical system
• the measured positions of the centres of curvature
• of the surfaces situated between this surface and the angle-measuring device and
• the spacings between the surfaces measured in step d) are taken into consideration computationally.

A method for measuring positions of centres of curvature of optical surfaces of a multi-lens optical system, comprising the following steps:

• a) provisionally determining an optical axis of the optical system;
• b) orienting the optical system in such a way that the optical axis provisionally determined in step a) is aligned with a reference axis;
• c) measuring spacings between the optical surfaces along the reference axis;
• d) measuring the positions of the centres of curvature of the optical surfaces using the optical angle-measuring device, wherein in the course of a measurement of the centre of curvature of an optical surface situated within the optical system;
• the measured positions of the centres of curvature of the optical surfaces situated between this optical surface and the angle-measuring device and
• the spacings between the optical surfaces measured in step c) are taken into consideration computationally.