Large caliber hyperboloid secondary mirror detecting system

Abstract

The invention provides a system for detecting large-aperture double-curved-surface secondary mirrors, which comprises a phase shift interferometer, two Hindle spherical-surface partitioning reflectors symmetrically placed, a detected large-aperture double-curved-surface secondary mirror and a computer system, wherein the computer system is connected with the phase shift interferometer; the two Hindle spherical-surface partitioning reflectors are used for realizing the sub-aperture null detection for a corresponding zone outside the center obscuration of the double-curved-surface secondary mirror; the data of two sub-aperture phases corresponding to a distinguishable interference fringe is extracted through phase shift interferometer data processing software installed in the computer system; the relative position of the detected large-aperture double-curved-surface secondary mirror and the two Hindle spherical-surface partitioning reflectors is relatively rotated through an adjusting mechanism, so as to realize the full aperture range test for the detected large-aperture double-curved-surface secondary mirror; enough overlap regions exist between adjacent sub-apertures so as to realize high-precision data splicing treatment; and finally obtained sub-aperture test data is sent into the computer system to be subjected to splicing treatment, so as to obtain the surface shape information of the detected large-aperture double-curved-surface secondary mirror. The invention provides an effective low-cost detecting means for developing the double-curved-surface secondary mirrors with large aperture and super large aperture, and has great 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 a large-diameter hyperboloid secondary mirror detection system. technical background [0002] The two-mirror optical system with the convex hyperboloid as the secondary mirror has been more and more widely used in the fields of astronomy and space optics. With the continuous development of optical manufacturing technology, the diameter of the hyperbolic secondary mirror is getting larger and larger. The manufacture of large-aperture hyperboloid secondary mirrors requires corresponding inspection techniques. However, there are still many challenges in the high-precision quantitative detection of large-aperture hyperbolic secondary mirrors. [0003] In the polishing process of the hyperboloid secondary mirror, the detection methods involved in the usual quantitative detection system include the aberra...

AI Technical Summary

Problems solved by technology

The advantage of this method is that it can detect the entire convex hyperboloid mirror without central obstruction; the disadvantage is that the structure of the detection system is relatively complicated, and the Hindle spherical shell also requires high material uniformity

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