CN109298517B - Multispectral coaxial catadioptric afocal optical system - Google Patents
Multispectral coaxial catadioptric afocal optical system Download PDFInfo
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- CN109298517B CN109298517B CN201811305351.8A CN201811305351A CN109298517B CN 109298517 B CN109298517 B CN 109298517B CN 201811305351 A CN201811305351 A CN 201811305351A CN 109298517 B CN109298517 B CN 109298517B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
- G02B17/0804—Catadioptric systems using two curved mirrors
- G02B17/0812—Catadioptric systems using two curved mirrors off-axis or unobscured systems in which all of the mirrors share a common axis of rotational symmetry
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Abstract
The invention relates to a multispectral coaxial catadioptric afocal optical system which comprises a primary lens, a secondary lens and an eyepiece group, wherein the eyepiece group consists of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The primary mirror is used for receiving incident light and reflecting the incident light to the secondary mirror; the secondary mirror is used for receiving the reflected light of the primary mirror to the eyepiece set; the eyepiece group is used for receiving the reflected light of the secondary mirror and emitting the reflected light. The coaxial catadioptric afocal optical system provided by the invention can meet the requirements of visible light and medium wave dual-waveband and common aperture, and is easy to process, install and adjust. Can receive light rays of two wave bands of 0.4-0.9 μm and 3-5 μm without generating chromatic aberration, and can be split by a subsequent imaging system, thereby having the characteristics of dual wave bands and common aperture. The multispectral coaxial catadioptric afocal optical system has the advantages of compact structure, large caliber, high system transfer function, good imaging quality, easy processing, and easy installation and adjustment.
Description
Technical Field
The invention belongs to the technical field of optics, and relates to a multispectral coaxial catadioptric afocal optical system.
Background
In recent years, long-focus, large-caliber and multiband imaging systems are increasingly applied to the fields of airborne and shipborne search and tracking. When the aperture exceeds 200mm, the multiband optical system has not been realized in a pure lens form due to material limitations. By adopting the off-axis reflective optical system, the problems of multiband and common aperture can be solved, but the processing and adjusting difficulty is high and the processing cost is high.
In order to meet the requirements of an optical system on large caliber, multiband requirements, easy processing and easy assembly and adjustment, the invention provides a multispectral coaxial catadioptric afocal optical system.
Disclosure of Invention
Technical problem to be solved
In order to avoid the defects of the prior art, the invention provides a multispectral coaxial catadioptric afocal optical system which can simultaneously meet the requirements of large caliber, multiband requirements, easy processing and easy assembly and adjustment.
Technical scheme
A multispectral coaxial catadioptric afocal optical system comprises a primary mirror 1, a secondary mirror 2 and an eyepiece group 3; a primary mirror 1, a secondary mirror 2 and an ocular group 3 are sequentially arranged along the direction of an optical path, wherein the ocular group 3 is positioned in the axial center area of the primary mirror 1 and is coaxial; the secondary mirror 2 is positioned on the reflection light path of the primary mirror 1, and the eyepiece group 3 is positioned on the reflection light path of the secondary mirror 2; the eyepiece group 3 comprises a first lens 3-1, a second lens 3-2, a third lens 3-3, a fourth lens 3-4, a fifth lens 3-5, a sixth lens 3-6 and a seventh lens 3-7 in sequence according to the direction of a light path; the primary mirror 1 is a concave mirror; the secondary mirror 2 is a convex mirror; the lenses in the eyepiece group 3 are all spherical surfaces. The primary mirror 1 receives incident light and reflects the incident light to the secondary mirror; the secondary mirror 2 receives the reflected light of the primary mirror to the eyepiece set; the eyepiece group 3 receives the reflected light of the secondary mirror and emits it.
The primary mirror 1 is a paraboloid.
The secondary mirror 2 is a high-order aspheric surface.
The optical system data is:
the primary mirror 1 and the secondary mirror 2 are made of microcrystalline glass.
The first lens 3-1 adopts zinc selenide.
The second lens 3-2, the fourth lens 3-4 and the sixth lens 3-6 adopt barium fluoride.
The third lens 3-3 and the seventh lens 3-7 use lithium fluoride.
The fifth lenses 3-5 adopt zinc fluoride.
The applicable wavelength lambda is 0.4 mu m-0.9 mu m and 3 mu m-5 mu m.
The system magnification f satisfies the condition: gamma is more than or equal to 4 and less than or equal to 8, and the effective caliber D meets the condition: d is not less than 50mm0≤300mm。
Advantageous effects
The invention provides a multispectral coaxial catadioptric afocal optical system which comprises a primary lens, a secondary lens and an eyepiece group, wherein the eyepiece group consists of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The primary mirror is used for receiving incident light and reflecting the incident light to the secondary mirror; the secondary mirror is used for receiving the reflected light of the primary mirror to the eyepiece set; the eyepiece group is used for receiving the reflected light of the secondary mirror and emitting the reflected light. The coaxial catadioptric afocal optical system provided by the invention can meet the requirements of visible light and medium wave dual-waveband and common aperture, and is easy to process, install and adjust.
The multispectral coaxial catadioptric afocal optical system can receive light rays of two wave bands of 0.4-0.9 mu m and 3-5 mu m without generating chromatic aberration, and can be subjected to light splitting by a subsequent imaging system, so that the multispectral coaxial catadioptric afocal optical system has the characteristics of two wave bands and common aperture. The multispectral coaxial catadioptric afocal optical system has the advantages of compact structure, large caliber, high system transfer function, good imaging quality, easy processing, and easy installation and adjustment.
Drawings
FIG. 1 is a schematic view of the optical path of the present invention
The eyepiece group 3 consists of a first lens 3-1, a second lens 3-2, a third lens 3-3, a fourth lens 3-4, a fifth lens 3-5, a sixth lens 3-6 and a seventh lens 3-7.
Detailed Description
The invention will now be further described with reference to the following examples and drawings:
the schematic diagram of the light path is a schematic diagram for realizing large-caliber and multiband imaging by adopting a coaxial refraction and reflection mode.
The multispectral coaxial catadioptric afocal optical system comprises a primary lens 1, a secondary lens 2 and an eyepiece group 3, wherein the eyepiece group 3 comprises a first lens 3-1, a second lens 3-2, a third lens 3-3, a fourth lens 3-4, a fifth lens 3-5, a sixth lens 3-6 and a seventh lens 3-7. The primary mirror 1 is used for receiving incident light and reflecting the incident light to the secondary mirror; the secondary mirror 2 is used for receiving the reflected light of the primary mirror to the eyepiece set; and the eyepiece group 3 is used for receiving the reflected light of the secondary mirror and emitting the reflected light.
The magnification of the multispectral coaxial catadioptric afocal optical system is 6; 0.4-0.9 μm wave band, F number 6.3, and visual field angle: 0.53 ° × 0.30 °; 3-5 μm wave band, F number 5.5, and angle of view 0.55 degree multiplied by 0.44 degree.
Specific optical parameters are shown in the following table.
TABLE 1 optical System data sheet
Claims (7)
1. A multispectral coaxial catadioptric afocal optical system is characterized by comprising a primary mirror (1), a secondary mirror (2) and an eyepiece group (3); the primary mirror (1), the secondary mirror (2) and the ocular group (3) are sequentially arranged along the direction of a light path, wherein the ocular group (3) is positioned in the axial center area of the primary mirror (1) and is coaxial; the secondary mirror (2) is positioned on the reflection light path of the primary mirror (1), and the ocular group (3) is positioned on the reflection light path of the secondary mirror (2); the eyepiece group (3) is sequentially provided with a first lens (3-1), a second lens (3-2), a third lens (3-3), a fourth lens (3-4), a fifth lens (3-5), a sixth lens (3-6) and a seventh lens (3-7) along the direction of a light path; the primary mirror (1) is a concave mirror; the secondary mirror (2) is a convex mirror; the lenses in the eyepiece group (3) are spherical surfaces; the primary mirror (1) receives incident light and reflects the incident light to the secondary mirror; the secondary mirror (2) receives the reflected light of the primary mirror to the eyepiece set; the eyepiece group (3) receives the reflected light of the secondary mirror and emits the reflected light;
the data of the optical system are:
2. the multispectral coaxial catadioptric afocal optical system of claim 1, wherein: the secondary mirror (2) is a high-order aspheric surface.
3. The multispectral coaxial catadioptric afocal optical system of claim 1, wherein: the primary mirror (1) and the secondary mirror (2) are made of microcrystalline glass.
4. The multispectral coaxial catadioptric afocal optical system of claim 1, wherein: the first lens (3-1) adopts zinc selenide.
5. The multispectral coaxial catadioptric afocal optical system of claim 1, wherein: the second lens (3-2), the fourth lens (3-4) and the sixth lens (3-6) adopt barium fluoride.
6. The multispectral coaxial catadioptric afocal optical system of claim 1, wherein: the third lens (3-3) and the seventh lens (3-7) adopt lithium fluoride.
7. The multispectral coaxial catadioptric afocal optical system of claim 1, wherein: and zinc sulfide is adopted as the fifth lens (3-5).
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| CN201811305351.8A CN109298517B (en) | 2018-11-05 | 2018-11-05 | Multispectral coaxial catadioptric afocal optical system |
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| CN110673316A (en) * | 2019-09-25 | 2020-01-10 | 中国电子科技集团公司第十一研究所 | Compact catadioptric optical system |
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| CN111258042A (en) * | 2019-12-30 | 2020-06-09 | 中国电子科技集团公司第十一研究所 | Catadioptric dual-waveband afocal optical system |
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| CN114236796B (en) * | 2021-12-17 | 2023-05-16 | 中国科学院长春光学精密机械与物理研究所 | Visible light-medium wave infrared afocal optical system |
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