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Large-view-field distortion elimination off-axis reflection optical system and design method

An off-axis reflection and optical system technology, which is applied in optics, optical components, instruments, etc., can solve the problems of large distortion of the field of view, complexity, reflection system, simple structure, large field of view, etc., and achieve high optical efficiency and system The effect of simple structure

Active Publication Date: 2020-03-24
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] (1) It is difficult to correct the chromatic aberration of the transmissive objective lens, and the field of view of the coaxial reflective system is limited and has a central obstruction
(2) The field of view of the off-axis two-mirror system is large but there is a large distortion, the field of view of the quasi-telecentric off-axis three-mirror is medium, and the off-axis four-mirror or five-mirror system is more complicated. Therefore, it is difficult for the usual reflective system to balance simple structure, Large field of view, excellent image quality and telecentric design

Method used

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  • Large-view-field distortion elimination off-axis reflection optical system and design method
  • Large-view-field distortion elimination off-axis reflection optical system and design method

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Embodiment Construction

[0014] The following is based on figure 1 Parameter, give a better embodiment of the present invention and elaborate:

[0015] Design an imaging spectrometer objective lens, followed by a spectrometer with a lateral magnification of -1, the size of the detector array used is 4096 elements × 256 elements, and the pixel size is 15 μm × 15 μm. The technical specification requirements of the telescopic objective lens are listed in Table 1.

[0016] Table 1

[0017] Spectral range focal length F number Field of view 0.4-2.5μm 84.4mm 3.5 40°

[0018] Design data are listed in Table 2.

[0019] Table 2

[0020]

[0021] The design results are: the optical system normalizes 0 field of view, 0.707 field of view and 1 field of view, the rms diameter of the spot diagram in the spectral range of 0.4-2.5 μm is less than 8 μm, and the pixel size is less than 15 μm. At the Nyquist cut-off frequency of 33.3pl / mm, normalized 0 field, 0.707 field and 1 field...

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Abstract

The invention discloses a large-view-field distortion elimination off-axis reflection optical system and a design method. The optical system is composed of a primary mirror, a secondary mirror, a field lens and an aperture diaphragm. Light from infinity is reflected by the primary mirror, reflected by the secondary mirror, reflected by the field lens and finally reaches an image plane, wherein theprimary mirror is an even-order aspheric off-axis convex surface, the secondary mirror is an even-order aspheric off-axis concave surface, and the field mirror is a convex free-form surface reflector. The aperture diaphragm is arranged at the primary mirror or between the primary mirror and the secondary mirror, and the secondary mirror can achieve image space telecentric design. In the two-mirror model, a reflective field lens is arranged in front of a focal plane, the surface type is set to be an extended polynomial, and optimization is performed after distortion control is added. The reflection optical system has the advantages of simple structure, total reflection, high optical efficiency, large field of view and low distortion, and is particularly suitable for being used as an optical system of a large-field-of-view push-broom imaging instrument and a telescope objective in a large-field-of-view spectral imaging instrument.

Description

technical field [0001] The invention relates to an optical system and optical design, in particular to a large field of view distortion-eliminating off-axis reflection optical system and a design method thereof. Background technique [0002] Pushbroom imaging spectrometers are widely used in aerospace applications, and can be used for mineral identification, agricultural and forestry monitoring, military reconnaissance, sea color and atmospheric detection, etc. The push-broom spectral imager puts forward higher requirements on the field of view of the optical system in order to improve operation efficiency and save flight costs; and in order to reduce the workload of calibration and post-data processing, the distortion of the instrument optical system is also raised. Therefore, in the process of optical system design, it is very necessary to consider the elimination of distortion as much as possible. [0003] The main problem that prior art exists is: [0004] (1) It is di...

Claims

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Application Information

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IPC IPC(8): G02B17/06G02B27/00
CPCG02B17/0626G02B27/0025
Inventor 袁立银谢佳楠王跃明何志平
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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