Large-aperture optical system MTF measuring device and method

Abstract

The invention provides a large-aperture optical system MTF measuring device and method in order to solve the technical problems that in a traditional large-aperture optical system MTF detecting mode,the testing precision is easily affected by the surface shape of an optical element in a large-aperture collimator, the disturbance resisting capacity is poor, and the testing cost is high. Accordingto the invention, a small-aperture plane mirror is used as a reference plane mirror, an active Hartmann wavefront sensor is used as wavefront measurement equipment, the small-aperture plane mirror ismoved to each sub-aperture position of a large-aperture optical system, and the active Hartmann wavefront sensor is used to acquire the wave aberration of each sub-aperture. When the full aperture iscompletely covered, sub-aperture wave aberration data are spliced by adopting a sub-aperture splicing algorithm to obtain full aperture wave aberration, and the full aperture wave aberration can be converted into an MTF value of an optical system after numerical calculation. According to the invention, the use of an interferometer and a large-aperture plane mirror is avoided, the anti-disturbancecapability of the whole system is improved, and the test cost is reduced.

Description

technical field [0001] The invention belongs to the field of optical detection, and relates to a large-diameter optical system MTF testing device and method. Background technique [0002] The research and launch of high-resolution optical imaging systems has always been the focus of researchers, and with the continuous improvement of resolution requirements, it is inevitable to require the use of large-aperture optical systems. [0003] The image quality of the large-aperture optical system needs to be evaluated during and after the adjustment process to determine whether it meets the design requirements. MTF (Modulation Transfer Function), as an important index for evaluating the imaging quality of optical systems, is widely used in the detection of optical systems. [0004] There are two ways to detect the MTF of the traditional large-aperture optical system: [0005] (1) Target imaging measurement. This measurement method uses a large-diameter collimator with a compara...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the technical problems of the traditional large-aperture optical system MTF detection method, the test accuracy is easily affected by the surface shape of the optical element in the large-aperture collimator, the anti-disturbance ability is poor, and the technical problems of high test cost, the present invention provides a large-aperture optical System MTF measuring device and method

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