Analysis method of position error of primary mirror block mirror in large-aperture film-based diffractive optical system

Abstract

The invention discloses a method for analyzing a position error of a primary mirror blocking mirror of a large-aperture film-based diffractive optical system. A non-sequence mode in ZEMAX is utilizedand Boolean operation is combined; a primary mirror model in a blocking form of a large-aperture film-based diffractive optical system is established; the shapes and the number of primary mirror blocking mirrors of a specific optical system are accurately represented; and a position error of an independen blocking mirror can be adjusted. And then a relationship between a position error limit of the blocking primary mirror of the large-aperture film-based diffractive optical system and a joint position error limit is established, and random errors are introduced to carry out accurate quantification to obtain various position error limits meeting the system requirements. With the system, the influence of the position error of each blocking mirror of the primary mirror of the large-aperture film-based diffractive imaging optical system on the image quality of the system can be described accurately and quantitatively.

Description

technical field [0001] The invention belongs to the technical field of image quality analysis of an imaging optical system, and in particular relates to a position error analysis method for a primary mirror block mirror of a large-diameter film-based diffractive optical system. Background technique [0002] The block-type film-based diffractive optical imaging system of large-aperture primary mirror is an important way to improve the spatial imaging resolution at present. The film-based diffractive optical imaging system has the characteristics of large aperture, high resolution, lightweight structure, and low surface accuracy requirements. The film-based diffractive optical imaging system using spliced ​​primary mirrors is easy to expand in space and easy to realize high-resolution imaging detection. Because the main mirror adopts the block mirror splicing method, when the imaging system is working in orbit, the space environment, manufacturing and assembly, etc. will cause...

AI Technical Summary

Problems solved by technology

[0004] In summary, the existing analysis methods for the position error of large-aperture block mirrors have limitations, and the approximate calculation method based on geometric relationship lacks the analysis of the influence of factors such as system composition, block mirror number and shape, and the results can only be used as Reference; methods based on optical design software cannot currently be applied to film-based diffractive optical systems

Therefore, there is a deviation between the error analysis results obtained by the existing methods and the actual situation, and it is difficult to accurately and quantitatively reflect the influence of the position error of the main mirror block mirror on the image quality of the system in a specific actual diffractive imaging optical system

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