High-precision adjustment method for large-aperture optical lens group

Abstract

The invention belongs to the technical field of telescope installation and adjustment methods, and particularly relates to a high-precision installation and adjustment method for a large-aperture optical lens group. The invention provides a high-precision installation and adjustment method for a large-aperture optical lens group, and the method comprises the following steps: S1, completing the installation and adjustment of at least two single lenses and corresponding lens bases, and forming a plurality of single lens assemblies; and S2, integrating the plurality of single lens assemblies in the step S1 to form a lens group. According to the adjustment method provided by the invention, the adjustment and detection of each lens can be realized on the premise of ensuring the surface shape precision of the mirror surface, the optical lens group can reach the optimal state, and compared with a traditional method, the method has relatively high application value and innovativeness.

Description

technical field [0001] The present application relates to the technical field of telescope structures, in particular to a high-precision adjustment method for a large-diameter optical lens group. Background technique [0002] In order to meet the needs of large-scale time-domain sky surveys, galaxy measurements, dark matter and dark energy detection, and extrasolar planetary searches, many large-field telescopes have been built in the world, such as the Japan Observatory’s 8.2m Subaru telescope, wide-field telescope The Dark Energy Spectrometer (DESI), the 8.4-meter-diameter coaxial three-mirror large-field telescope LSST, the two 2-meter telescopes PS1 and PS2 of the Pan-STARRS project of the Pan-STARRS, the Xinglong Observation Base 2.16-meter telescope, etc. In order to achieve a large relative aperture and a large field of view, one of the main features of the above telescope is that it adopts an optical system in the form of a main focus, and an optical lens with a very...

AI Technical Summary

Problems solved by technology

[0005] (1) The difficulty of optical lens assembly and adjustment is greatly improved with the increase of caliber;

[0006] (2) The surface shape accuracy and position accuracy of the optical lens are coupled with each other, that is, the surface shape accuracy will decrease when adjusting the position of the lens;

[0007] (3) The position error between lenses includes spacing error and coaxial error, and for large lenses, it is difficult to measure the spacing and coaxial

This method of adjustment is very effective for small-diameter lenses, because the position adjustment and detection of small lens groups are very easy to operate, which is obviously difficult to apply to the adjustment of large-diameter optical lens groups

Another serious shortcoming: the accuracy of the mirror surface shape of the lens is not considered when the lens is assembled and adjusted, and only the relative position deviation between the lenses is concerned. This is feasible for small lenses, because the lens position adjustment will not cause small aperture lens mirror surface Decreased surface accuracy

However, for large-aperture lenses, the adjustment process has a great influence on the surface shape accuracy of the mirror surface. In the adjustment process, not only the relative position deviation of the lens, but also the surface shape accuracy of the mirror surface should be considered, otherwise it may cause such a phenomenon: The relative position deviation is small, but the mirror surface shape accuracy is very poor, which will also greatly reduce the performance of the optical system

In addition, it is difficult to detect the spacing error of large-aperture lenses with a depth micrometer, and only non-contact measurement methods can be used. Moreover, large-aperture lenses are very heavy, and it is very difficult to adjust the position. Directly adjusting the lens will easily cause a decrease in surface shape accuracy or even damage the lens. body

In summary, the existing technical methods are difficult to be directly applied to the assembly and adjustment of large-aperture optical lens groups.

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