Fan shape off-axis aspherical splicing measuring systems

Abstract

The invention provides a sectorial off-axial aspheric surface stitching measurement system, comprising a Fizeau interferometer, a detected sectorial off-axial aspherical mirror, an electrically controlled translation platform and a computer control system, wherein, the electrically controlled translation platform is controlled through the computer to move the Fizeau interferometer, so that reference spheric wave fronts of different curvature radiuses generated by a standard lens can be matched with a sectorial region corresponding to the detected sectorial off-axial aspheric surface, and phase data corresponding to resolvable interference fringes can be extracted through data processing software of the Fizeau interferometer installed on the computer system; acquired sub-aperture test data undergo a full aperture wave front reconstruction by an expanded annular sub-aperture 'stitching' algorithm, thereby acquiring surface shape information of the detected aspheric surface. The sectorial off-axial aspheric surface stitching measurement system can realize low cost detection for the sectorial off-axial aspheric surface of appropriate deviation without a special auxiliary optical element, and has higher application value.

Description

technical field [0001] The invention belongs to the technical field of advanced optical manufacturing and detection, and relates to an optical detection system, in particular to an optical detection system for fan-shaped off-axis aspheric surfaces. technical background [0002] In order to observe more early cosmic events and further study the terrestrial planets outside the solar system, it is necessary to have space and ground telescopes with stronger light-gathering capabilities, higher resolution, and larger apertures. Chinese astronomers put forward the suggestion of the China 30m Aperture Giant Telescope (CFGT). Its primary mirror is composed of 17 different types of off-axis aspheric sub-mirrors arranged in a circular ring. For a detailed description, please refer to the document "A Giant Telescope Scheme, Su Dingqiang, Wang Yanan, Cui Xiangqun, Chinese Journal of Astronomy, 45(1): 105-114, 2004.". The manufacture of fan-shaped off-axis aspheric mirrors requires a co...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a fan-shaped sub-aperture splicing detection system for the fan-shaft aspheric mirror, which can effectively solve the problem of auxiliary components in the existing quantitative detection technology (large-aperture high-precision reflection Mirror, zero compensator) manufacturing difficulties, high cost, sensitive assembly and adjustment errors, etc., and has a simple structure, low inspection cost, and a certain dynamic test range

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