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Large-focal-ratio wide-field-of-view off-axis three-mirror optical system with real entrance pupil

An optical system, off-axis three-mirror technology, applied in optics, optical components, instruments, etc., can solve the problems of no real entrance pupil, unable to achieve accurate matching of entrance pupil surfaces, etc., to reduce the difficulty of assembly and adjustment.

Inactive Publication Date: 2019-05-10
NANJING INST OF ASTRONOMICAL OPTICS & TECH NAT ASTRONOMICAL OBSE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Large-focal-ratio wide-field-of-view off-axis three-mirror optical system with real entrance pupil
  • Large-focal-ratio wide-field-of-view off-axis three-mirror optical system with real entrance pupil
  • Large-focal-ratio wide-field-of-view off-axis three-mirror optical system with real entrance pupil

Examples

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Embodiment 1

[0030] Example 1, a large focal ratio off-axis three-mirror optical system with a real entrance pupil, refer to figure 1 As shown: the entire optical system includes a diaphragm 1, a primary mirror 2, a secondary mirror 3, a third mirror (referred to as the three mirrors) 4, and a focal plane 5, and the primary mirror 1 is a concave off-axis dual The curved reflector, the secondary mirror 2 is a convex axisymmetric paraboloid, and the third mirror 5 is a concave off-axis ellipsoidal reflector containing a 4th-order high-order term.

[0031] In this structure, the entrance pupil diameter is 350mm, the focal ratio of the optical system is 13.8, the effective field of view is 2º×2º, the aperture of the entrance pupil diaphragm is 486.6mm off-axis in the Y-axis direction, the center field of view is 3º off-axis in the Y-axis direction, and the X-axis direction is 3º. The field of view is -1º to +1º, and the field of view in the Y-axis direction is +3º to +5º.

[0032] In this emb...

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Abstract

The invention discloses a large-focal-ratio wide-field-of-view off-axis three-mirror optical system with a real entrance pupil. The whole optical system comprises a diaphragm, a main mirror, a secondary mirror, a third reflecting mirror and a focal plane and is characterized in that a real diaphragm is arranged in front of the main mirror, a distance between the main mirror and the real diaphragmis greater than a mirror interval between the main mirror and the secondary mirror, and the real entrance pupil of the off-axis three-mirror optical system is formed; and the curvature radius R1 of the main mirror, the curvature radius R2 of the secondary mirror and the curvature radius R3 of the vertex of the convex third reflecting mirror approximately meet a flat image field condition 1 / R1+1 / R3=1 / R2. By use of the system, the defect in the prior art that the entrance pupil surface of a detected space camera and the entrance pupil surface of a spectrograph camera can not be accurately matched since the diagram is positioned on the main mirror and is not provided with the real entrance pupil can be overcome. The optical system disclosed by the invention is provided with the real entrancepupil, the focal ratio of the optical system is greater than 12, a field of view 2o*2o is designed, and the wavefront quality of the optical system is superior to RMS (Root Mean Square) 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...

Claims

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Application Information

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IPC IPC(8): G02B17/06
Inventor 姜海娇
Owner NANJING INST OF ASTRONOMICAL OPTICS & TECH NAT ASTRONOMICAL OBSE
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