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Cooled free-form surface off-axis four-mirror optical system with large relative aperture

A relative aperture and optical system technology, applied in optics, optical components, instruments, etc., can solve problems such as inability to adapt to cooled detectors, large volume envelope, and narrow imaging field of view

Active Publication Date: 2021-09-14
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

[0011] In order to solve the technical problems of existing off-axis reflective optical systems, such as narrow imaging field of view, large volume envelope, small relative aperture, or inability to adapt to cooled detectors, the present invention provides a large relative aperture Cooled free-form off-axis four-mirror optical system

Method used

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  • Cooled free-form surface off-axis four-mirror optical system with large relative aperture
  • Cooled free-form surface off-axis four-mirror optical system with large relative aperture
  • Cooled free-form surface off-axis four-mirror optical system with large relative aperture

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Embodiment

[0082] Various numerical data related to the optical system of the examples are as follows:

[0083] F / #=1.5, F# is the reciprocal of the ratio of the entrance pupil diameter to the focal length, that is, F=f / D

[0084] Adaptive detector array: 512×512

[0085] Adaptive detector pixel: 25μm×25μm

[0086] Working spectrum range: 8μm~14μm

[0087] Full field of view range: 10°×10°

[0088] Full field of view relative distortion: ≤5%

[0089] First reflector 3 reflective surface, second reflector 4 reflective surface, third reflector 5 reflective surface, fourth reflector 6 reflective surface apex, detector window center relative to the first three-dimensional Cartesian coordinate system (x 1 ,y 1 ,z 1 ) and the partial surface parameter data of the reflective surface are shown in Table 2 below.

[0090] Table 2 The relative vertices of each mirror (x 1 ,y 1 ,z 1 ) coordinate system position and surface parameter table.

[0091]

[0092]

[0093]

[0094] Note...

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Abstract

The present invention provides a cooling type free-form surface off-axis four-reflection optical system with large relative aperture, which solves the problem of existing off-axis reflective optical systems, such as narrow imaging field of view, large volume envelope, or small relative aperture, or The problem of not being able to adapt to the cooling type detector. The system includes a first reflector, a second reflector, a third reflector and a fourth reflector, a detector cold window and a detector cold stop which are fixedly connected in sequence from the object plane to the focal plane; the first reflector and The third reflecting mirror has negative optical power; the second reflecting mirror and the fourth reflecting mirror have positive optical power; the equivalent focal length of the second reflecting mirror is f4 and the cooling type free-form surface off-axis four-reflection optical system with large relative aperture The equivalent focal length is fL to satisfy the conditional formula: 0.9<|fL / f4|<1.46; the magnification of the fourth reflector is m6, and m6 satisfies the conditional formula: 0.74<|m6|<2.2; the reflective surface of the first reflector, The reflection surface of the second reflection mirror, the reflection surface of the third reflection mirror and the reflection surface of the fourth reflection mirror all adopt Zernike polynomial free-form surfaces.

Description

technical field [0001] The invention belongs to the field of optoelectronic technology, and relates to an off-axis four-reflection optical system, in particular to a free-form off-axis four-reflection optical system with a large relative aperture, a wide imaging field of view, and compact volume, which can be adapted to a cooling detector . Background technique [0002] Off-axis reflective optical systems have been used in many fields, especially in the field of cryogenic optics, due to their advantages of no chromatic aberration, good heat resistance, and low thermal noise. However, off-axis reflective optical systems using traditional curved surfaces such as quadric surfaces and even-order aspheric surfaces are difficult to simultaneously achieve the requirements of large relative aperture, wide field of view, and compact envelope due to the small number of available design variables. [0003] On the other hand, for cooled detectors, the exit pupil of the optical system s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B17/06
CPCG02B17/0647G02B17/0663
Inventor 曲锐陈卫宁马迎军张洪伟杨洪涛
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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