Off-axis three-mirror optical system with large focal ratio and wide field of view with real entrance pupil

Abstract

A large focal ratio off-axis three-mirror optical system with a real entrance pupil. The entire optical system includes a diaphragm, a primary mirror, a secondary mirror, a third mirror and a focal plane. It is characterized in that a real diaphragm is set in front of the primary mirror, and The distance of the primary mirror is greater than the distance between the primary and secondary mirrors, forming the real entrance pupil of the off-axis three-mirror optical system; the radius of curvature R1 of the primary mirror, the radius of curvature R2 of the secondary mirror and the curvature of the apex of the convex third reflector The radius R3 approximately satisfies the flat image field condition 1 / R1+1 / R3=1 / R2. The present invention overcomes the defect of the prior art that "the aperture is located on the primary mirror without a real entrance pupil, and the exact matching of the entrance pupil surfaces of the detected space camera and the spectrometer camera cannot be realized". The optical system of the present invention has a real entrance pupil, and the optical The focal ratio of the system is greater than 12, the design field of view is 2º×2º, and the wavefront quality of the optical system is better than RMS 1 / 40 wavelength.

Description

technical field [0001] The invention relates to the detection field of a space camera and a spectrometer photographic mirror, in particular to an off-axis three-mirror optical system with a large focal ratio and a wide field of view with a real entrance pupil. Background technique [0002] In the detection of space cameras and spectrometer cameras, a collimator optical system with a wide field of view and a large focal ratio is required to test the imaging quality of space cameras and spectrometer cameras. The entrance pupils of space cameras and spectrometer cameras need to be in line with The exit pupil planes of the detection optics are matched, so it is required that the detection optics have a solid entrance pupil. [0003] The off-axis three-mirror optical imaging system has the characteristics of simple structure, no obstruction, wide field of view, no dispersion, good image quality, and compact structure. It can achieve high resolution and high energy utilization, an...

AI Technical Summary

Problems solved by technology

The above two apertures are located on the primary mirror, without a real entrance pupil, so it is impossible to accurately match the entrance pupil surfaces of the detected space camera and the spectrometer camera

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