Multi-focus multi-visual field shielding-free total reflection astigmation free optical system

An optical system, multi-field of view technology, applied in the field of optical systems, can solve problems such as one-time occlusion, and achieve the effects of reducing external size and weight, compact system structure, and improving optical efficiency

Inactive Publication Date: 2008-10-15
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a multi-focal length and multi-field of view non-shielding total refl

Method used

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  • Multi-focus multi-visual field shielding-free total reflection astigmation free optical system
  • Multi-focus multi-visual field shielding-free total reflection astigmation free optical system
  • Multi-focus multi-visual field shielding-free total reflection astigmation free optical system

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0019] Example 1:

[0020] according to figure 2 The optical structure shown is designed to work in the visible and infrared bands of push-broom cameras. The main technical indicators of the two cameras are:

[0021] Orbit height: 450km

[0022] Spectral range: 0.46~1μm; 2.7~4.3μm

[0023] Angular resolution: 1.5m; 6.75m

[0024] Field of view: 7.85km

[0025] Detector: 6000 yuan CCD linear array 8μm×8μm; 1200 yuan CCD linear array 30μm×30μm

[0026] The technical indicators of the main optical system are:

[0027] Caliber: 200mm

[0028] Visible camera focal length: 2500mm; infrared camera focal length: 2000mm

[0029] Wavelength: 0.46~1μm; 2.7~4.3μm

[0030] Resolution: 3.2μrad; 15μrad

[0031] Field of view: 1°

[0032] Image quality optimization: The RMS of visible and infrared cameras are better than 4μm and 12μm, respectively, and the MTF is close to the diffraction limit. The structure parameters are shown in Table 1.

[0033] Table 1

[0034] Parameter

Example Embodiment

[0035] Example 2:

[0036] according to image 3 The optical structure shown is designed to work in the visible and infrared bands of scanning cameras. The main technical indicators of the camera are:

[0037] Orbit height: 600km

[0038] Spectral range: 0.46~1μm; 2.7~4.3μm

[0039] Angular resolution: 1.1m; 4.5m

[0040] Unit detector: 8μm×8μm; 30μm×30μm

[0041] The technical indicators of the main optical system are:

[0042] Caliber: 300mm

[0043] Visible camera focal length: 4500mm; infrared camera focal length: 4000mm

[0044] Wavelength: 0.46~1μm; 2.7~4.3μm

[0045] Resolution: 1.8μrad; 7.5μrad

[0046] Image quality optimization: The RMS of visible and infrared cameras are better than 5μm and 9μm, respectively, and the MTF is close to the diffraction limit. The structure parameters are shown in Table 2.

[0047] Table 2

[0048] Parameter

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Abstract

The invention discloses a multi-focus multi-field coverage unscreened total reflection stigmatic optical system which is characterized in that: the invention comprises two lens groups; a first lens group comprises a main reflector and an auxiliary reflector; the second lens group comprises two or a plurality of third reflectors; any one of the third reflectors in the second lens group and the first lens group form a three-mirror reflective stigmatic optical system. Because curvatures and positions, the curvatures and aspherical higher order terms, or the curvatures, the positions and the aspherical higher order terms of the plurality of third reflectors in the second lens group are all different, the multi-focus multi-field coverage optical system is realized.

Description

technical field [0001] The invention belongs to the field of optical systems, and in particular relates to an optical system with multi-focal lengths and multi-fields of non-shielding total reflection to eliminate astigmatism. Background technique [0002] Due to the limited aperture of the transmissive material, the reflective optical system plays an important role in space-to-Earth observation of outer space. Among them, the three-reflection astigmatism-eliminating optical system disclosed by Korsch in US.4,101,195 has a compact structure and good image quality, and is more and more widely used. There are generally more than one space observation instrument, and light energy is collected through a main optical system. COOK LACY.G disclosed in EP.0,364,951 (US.4,993,818) and US.4,964,706 a three-reflection astigmatism-eliminating optical system with multiple focal lengths and multiple fields of view. The system has a simple structure and excellent image quality. The diffe...

Claims

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Application Information

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IPC IPC(8): G02B17/06
Inventor 于清华孙胜利王奇伟
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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