An optical system calibration method based on the aperture division of a corner cube prism

The optical system calibration method using a cornerstone prism to divide the aperture solves the problem of measuring the assembly and adjustment error of large-aperture optical systems, and realizes fast and convenient measurement and feedback of assembly and adjustment errors, which is applicable to a variety of optical systems.

CN117147113BActive Publication Date: 2026-05-26NANJING ZHONGKE ASTROMOMICAL INSTR
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Patent Information

Application Number
CN202311139523.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-09-05
Publication Date
2026-05-26
Estimated Expiration
2043-09-05

AI Technical Summary

Technical Problem

Existing technologies make it difficult to quickly and conveniently measure the assembly and adjustment errors of large-aperture optical systems, and the processing of large-aperture plane mirrors is costly and time-consuming, which is not conducive to the actual assembly and adjustment process.

Method used

An optical system calibration method using corner prisms to divide the aperture involves fixing a corner prism array on a substrate to cover the aperture of the optical system, measuring light wave reflection using an interferometer, and reconstructing the wavefront using modal integration to quickly measure the assembly and adjustment error.

Benefits of technology

It enables rapid and convenient measurement of optical system assembly and adjustment errors, reduces the need for precise adjustment of the angle cone prism's attitude and position, provides reliable assembly and adjustment feedback, and is suitable for various optical systems.

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Abstract

This invention discloses an optical system calibration method based on aperture segmentation using cornerstone prisms, comprising a cornerstone prism array, an interferometer, and an optical system under test. The main steps are: (1) uniformly fixing cornerstone prisms onto a substrate according to the shape of the aperture of the optical system under test to form a cornerstone prism array; (2) adjusting the cornerstone prism array to cover the aperture of the optical system under test; (3) placing the interferometer at the focal point of the optical system under test, and the light waves emitted by the interferometer are reflected back by the cornerstone prism array after passing through the optical system under test, forming a multi-aperture interferogram; (4) acquiring multiple interferograms at once, calculating the wavefront slope of each region from the multiple interferograms, obtaining the wavefront through integration, and finally fitting to obtain the system wavefront aberration. This invention allows for flexible changes in the cornerstone prism splicing method for different apertures, quickly adapting to different optical systems, and is convenient to assemble and adjust, possessing good applicability.
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