CN106371200A - Broad wave band, large view field and large aperture coude three reflection afocal optical system - Google Patents
Broad wave band, large view field and large aperture coude three reflection afocal optical system Download PDFInfo
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- CN106371200A CN106371200A CN201610986110.9A CN201610986110A CN106371200A CN 106371200 A CN106371200 A CN 106371200A CN 201610986110 A CN201610986110 A CN 201610986110A CN 106371200 A CN106371200 A CN 106371200A
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- mirror
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- reflection
- reflection mirror
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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
- G02B17/02—Catoptric systems, e.g. image erecting and reversing system
- G02B17/06—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror
- G02B17/0626—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror using three curved mirrors
Abstract
The invention discloses a broad wave band, large view field and large aperture coude three reflection afocal optical system used for detecting long-distance objects within a large scope, and object detection distance and detection probability can be improved. In a structure of the optical system, a main reflecting mirror with a paraboloid and a secondary reflecting mirror with double curved surfaces form a telescope objective system, an object space focal point of a three reflection mirror with double curved surfaces and an image space focal point of a telescope objective coincide, an entrance pupil is positioned on the main reflecting mirror, and a plane scanning mirror is positioned on an exit pupil of the system In the optical structure provided in the invention, design of the large view field and large aperture coude three reflection afocal optical system free from secondary block is realized via small decentration and inclination. Compared with a coaxial system, the coude three reflection afocal optical system is advantageous in that while a similar mechanical structure is kept, secondary blocking caused by three mirrors in a large view filed can be prevented, and the view field can be enlarged; compared with a conventional off-axis system, the coude three reflection afocal optical system is advantaged by compact structure, small size, capability of meeting requirements for system miniaturization and light weight, small introduced decentration and inclination, large amplification factor, and MTF close to a diffraction limit.
Description
Technical field
The present invention relates to a kind of broadband big visual field heavy caliber folding anti-non-focus optical system of axle three, before being applicable to the third generation
Preposition no burnt telescopic system depending on infrared system.
Background technology
Afocal system is also referred to as telescopic system, as a kind of important optical system, is mainly used in laser beam expanding, infrared
In FLIR, telephoto lens and zoom lens.Wherein, forward looking infrared system is by preposition look in the distance afocal system and follow-up imaging
System is constituted.Preposition afocal system of looking in the distance, as the common aperture portion of multi channel imaging system, entrance pupils is compressed, sweeps
Retouch mechanism be located at emergent pupil at, reflected go out collimated beam enter follow-up imaging system.With Raytheon Co. of the U.S. and night vision and
The third generation FLIR imaging system of electronic sensor committee R ＆ D Cooperation, infrared system of new generation is towards visual field scalable
Scope constantly expands；The continuous broadening of detecting band；Detector resolution improves constantly；The direction of system structure miniaturization is developed.
Meanwhile, for the design requirement of optical system, also completely different with earlier generations infrared system it is desirable to optical system
System has the wave band of the visual field widened, big relative aperture and broadening.Wherein, the band widened to the selection of optical material and
The selection of design structure pattern all has an impact.Common optical system structure is broadly divided into refraction type, reflective and refraction-reflection type
Three kinds.For refraction type and refraction-reflection type system, optical system, to realize the features such as broadband, heavy caliber, is often required to introduce spy
Eliminating the impact of second order spectrum, therefore its application is subject to certain restrictions for different optical material or more complicated structure.Compare
Under, reflective optical system is entirely without aberration, little to the attenuation ratio transmission material of light and space availability ratio is high, can be well
Realize the application demand of broadband, heavy caliber, miniaturization.
At present, mostly adopt large-aperture off-axis three-mirror optical system both at home and abroad, but it has certain deficiency, such as off axis reflector
Although system is it can be avoided that secondary block, there is good picture matter.But for heavy caliber system, it is larger from axle amount, multiplying power is difficult
Big in doing, and processing cost and resetting difficulty greatly increase.
Content of the invention
The present invention in view of the shortcomings of the prior art, provide a kind of no secondary block, wide visual field, high magnification, tie
Structure is compact, and low cost is it is adaptable to preposition no burnt telescopic system in third generation forward looking infrared system.
For achieving the above object, the technical solution adopted in the present invention is to provide a kind of broadband big visual field heavy caliber
The folding anti-non-focus optical system of axle three, it includes principal reflection mirror, secondary mirror, three reflecting mirrors and flat scanning mirror, and described master is anti-
Penetrating mirror is paraboloidal mirror, and with respect to incident light direction, the extent of the error of principal reflection mirror is 20mm～40mm, slant range is 0 °～
2 °, described secondary mirror is hyperbolic mirror, and with respect to incident light direction, the extent of the error of secondary mirror is 20mm～40mm,
Slant range is 1 °～5 °, and three described reflecting mirrors are hyperbolic mirror, with respect to incident light direction, the extent of the error of three reflecting mirrors
For -55mm～-30mm, slant range is 5 °～10 °；Described optical system is using folding axle three reef knot with middle real image
Structure, principal reflection mirror, secondary mirror and three reflecting mirrors are located at different optical axises respectively, and their focal power is just；Principal reflection mirror
Constitute telephotolens with secondary mirror, three reflecting mirrors are collimating mirror；The entrance pupil of described optical system is located on principal reflection mirror, is derived from
After the infra-red radiation of target reflects through principal reflection mirror and secondary mirror, in being formed between described principal reflection mirror and secondary mirror
Between picture, then after three reflecting mirrors collimations, the parallel light path emergent pupil of outgoing is located at flat scanning Jing Chu；The aperture diaphragm of optical system
On principal reflection mirror.
In technical solution of the present invention, when the focal length of described telephotolens system is f1, the focal length of collimating mirror is f2, three
The laser beam compression of anti-non-focus optical system compares m=f1/f2.The 1/m of aperture of mirror is reflected, m is based on the optics bore of flat scanning mirror
Laser beam compression ratio.
Primary mirror, secondary mirror and three mirrors that the big visual field of broadband of the present invention heavy caliber rolls over the anti-non-focus optical system of axle three divide
Optical axis that Wei Yu be not different is it is adaptable to broader view field imaging.The object lens of optical system and three mirrors are positive light coke, are equivalent to
One Kepler telescope, and enlargement ratio is 5.5 times.
Compared with prior art, present invention has an advantage that
1. optical system to be realized big visual field using aspheric surface and requires, compact conformation, and meet system wide visual field and miniaturization will
Ask.
2. optical system, by each reflecting surface mirror is carried out with small bias and inclination, realizes the no secondary broadband blocked
The big visual field heavy caliber folding anti-non-focus optical system of axle three, is easy to reception and the imaging of follow-up image-forming block.
3. compared with coaxial system, optical system still retains similar structure, but avoids secondary blocking；Visual field can be done relatively
Greatly.
4., compared with traditional off-axis system, the optical system volume that the present invention provides is less；The bias introducing and tilt quantity
Very little, but reduction magnification is larger.
Brief description
Fig. 1 is that the structure of the broadband provided in an embodiment of the present invention big visual field heavy caliber folding anti-non-focus optical system of axle three is shown
It is intended to；
Fig. 2 is the modulation transmission letter that broadband provided in an embodiment of the present invention big visual field heavy caliber rolls over the anti-non-focus optical system of axle three
Number curve figure；
Fig. 3 is the point range figure that broadband provided in an embodiment of the present invention big visual field heavy caliber rolls over the anti-non-focus optical system of axle three；
In Fig. 1: 1, principal reflection mirror and entrance pupil position；2nd, secondary mirror；3rd, intermediate image plane；4th, three reflecting mirror；5th, flat scanning mirror
And exit pupil position；6th, perfect lenses；7th, preferable image planes.
Specific embodiment
With reference to the accompanying drawings and examples technical solution of the present invention is further specifically described.
Embodiment 1
A kind of broadband big visual field heavy caliber folding anti-non-focus optical system of axle three that the present embodiment provides, it is anti-that it includes parabola master
Penetrate mirror, hyperboloid secondary mirror, hyperboloid three reflecting mirror and flat scanning mirror.Three anti-afocal systems are using the folding axle having intermediary image
Tma version, the infra-red radiation angle pencil of ray from target is compressed into light pencil, amplifies the angle of visual field simultaneously, no secondary blocks
Extraction reality emergent pupil, be easy to reception and the imaging of follow-up image-forming block.
Referring to accompanying drawing 1, the broadband big visual field heavy caliber folding axle three anti-non-focus optical system knot that it provides for the present embodiment
Structure schematic diagram, the entrance pupil of optical system is located on principal reflection mirror 1, and the emergent pupil being conjugated with it is located at flat scanning Jing5Chu；From remote
The infrared energy of place's target, after the objective lens parabola principal reflection mirror 1 of telescope and hyperboloid secondary mirror 2, is formed
The intermediary image 3 of target, its position is in the focus of hyperboloid three reflecting mirror 4, then carries out standard by three reflecting mirrors 4 to light path
Directly, the parallel light path emergent pupil of outgoing is located at flat scanning Jing5Chu；The aperture diaphragm of non-focus optical system is located on principal reflection mirror 1.
Principal reflection mirror 1, secondary mirror 2 and three reflecting mirrors 4 are located at different optical axises respectively, and focal power is just；Principal reflection
Mirror 1 and secondary mirror 2 constitute telephotolens, and the focal length of telephotolens system is f1, and three reflecting mirrors 4 are collimating mirror, collimating mirror
Focal length is f2, then the laser beam compression of no burnt telescope optical system compares m=f1/f2.Reflect based on the optics bore of flat scanning mirror 5
The 1/m of mirror 1 bore, m are laser beam compression ratio.
For the ease of being analyzed to optical system and evaluating, add perfect lenses group 6 in the parallel light path of outgoing, make
On its ideal image resonable imagination face 7.
The anti-non-focus optical system of folding axle three that the present embodiment provides, mtf is close to diffraction limit.Systematic technical indicator is as follows:
Telescope clear aperture: φ 320mm；
Visual field: 2 ° × 3.2 °；
Operation wavelength: 3 μm～12 μm；
Telescope enlargement ratio: 5.5 times.
The maximum feature of the optical system of the present invention is exactly to remain the structure similar with coaxial system at it, by micro-
Little bias and inclination, realize the no secondary extraction blocked reality emergent pupil；To realize big visual field using aspheric surface to require, structure is tight
Gather, small volume；And with respect to for off-axis system, be easy to debug, cost reduces.
What the present embodiment provided rolls over the anti-non-focus optical system of axle three, its primary structure for the big visual field of broadband is bigbore
As shown in table 1, the offset of each reflecting mirror is as shown in table 2 with tilt quantity for parameter
The anti-afocal system structural parameters of table 1 folding axle three
| Reflecting mirror | Radius/mm | Spacing/mm | conic | Focal length/mm | High order term coefficient |
| Primary mirror | -598.6 | -211.6 | -1 | -- | 3.1e-16, -1.8e-20,4.5e-25 |
| Secondary mirror | -235.1 | 544.7 | -2.8 | -- | - 3.6e-13,1.2e-16, -1.6e-20 |
| Three mirrors | -395.5 | -295.3 | -1.2 | -- | - 1.6e-13,2.6e-17, -2.0e-21 |
| Scanning mirror | -- | 200 | -- | -- | -- |
| Perfect lenses | -- | 200 | -- | 200 | -- |
Table 2 each reflecting surface bias and tilt quantity
| Reflecting mirror | Eccentric (mm) | Tilt (°) |
| Primary mirror | 29.273 | 0.436 |
| Secondary mirror | 23.196 | 2.364 |
| Three mirrors | -41.602 | 6.805 |
Referring to accompanying drawing 2, it is modulation transfer function (MTF) (mtf) curve of system, weight factor at 3 μm of wavelength, 7.5 μm, 12 μm
When being 1, sampling number is 64 × 64, modulation transfer function (MTF) (mtf) curve at optical system ideal image planes, as shown in Figure 2.Its
Middle black line represents diffraction limit mtf curve, and other curves represent the situation of different visual fields it is seen that picture matter is close to diffraction limit.
Referring to accompanying drawing 3, it is the point range figure in ray tracing ideal image plane, and in figure black circles represent Airy disk.Can
See that image patch major part energy concentrates in Airy disk, show the image quality that this system has had.
Claims (3)
1. a kind of broadband big visual field heavy caliber folding the anti-non-focus optical system of axle three it is characterised in that it include principal reflection mirror (1),
Secondary mirror (2), three reflecting mirrors (4) and flat scanning mirror (5), described principal reflection mirror (1) is paraboloidal mirror, with respect to incidence
Light direction, the extent of the error of principal reflection mirror is 20mm～40mm, and slant range is 0 °～2 °, and described secondary mirror (2) is double
Curved mirror, with respect to incident light direction, the extent of the error of secondary mirror is 20mm～40mm, and slant range is 1 °～5 °, described
Three reflecting mirrors (4) be hyperbolic mirror, with respect to incident light direction, the extent of the error of three reflecting mirrors is -55mm～-30mm, inclines
Tiltedly scope is 5 °～10 °；Described optical system is using folding axle three antistructure with middle real image, principal reflection mirror (1), secondary anti-
Penetrate mirror (2) and three reflecting mirrors (4) are located at different optical axises respectively, their focal power is just；Principal reflection mirror (1) and secondary reflection
Mirror (2) constitutes telephotolens, and three reflecting mirrors (4) are collimating mirror；The entrance pupil of described optical system is located on principal reflection mirror (1), comes
After reflecting through principal reflection mirror (1) and secondary mirror (2) from the infra-red radiation of target, in described principal reflection mirror (1) and secondary reflection
Form intermediary image (3) between mirror (2), then after three reflecting mirrors (4) collimation, the parallel light path emergent pupil of outgoing is located at flat scanning mirror
(5) place；The aperture diaphragm of optical system is located on principal reflection mirror (1).
2. the big visual field of broadband according to claim 1 heavy caliber folding the anti-non-focus optical system of axle three it is characterised in that: when
The focal length of described telephotolens system is f1, and the focal length of collimating mirror is f2, and the laser beam compression of three anti-non-focus optical systems compares m=
f1/f2.
3. the big visual field of the broadband according to claim 1 heavy caliber folding anti-non-focus optical system of axle three it is characterised in that: flat
The 1/m of reflecting mirror (1) bore based on the optics bore of Surface scan mirror (5), m are laser beam compression ratio.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610986110.9A CN106371200B (en) | 2016-11-09 | 2016-11-09 | The big visual field heavy caliber of broadband rolls over three anti-non-focus optical system of axis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610986110.9A CN106371200B (en) | 2016-11-09 | 2016-11-09 | The big visual field heavy caliber of broadband rolls over three anti-non-focus optical system of axis |
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| Publication Number | Publication Date |
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| CN106371200A true CN106371200A (en) | 2017-02-01 |
| CN106371200B CN106371200B (en) | 2018-08-24 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107132028A (en) * | 2017-05-05 | 2017-09-05 | 中国科学院西安光学精密机械研究所 | The big off-axis three reflecting optical systems MTF test devices in visual field and method of testing |
| CN108227166A (en) * | 2017-11-29 | 2018-06-29 | 苏州亿帝电子科技有限公司 | A kind of off-axis two anti-systems of microchip laser rangefinder |
| CN111367067A (en) * | 2018-12-25 | 2020-07-03 | 中国科学院长春光学精密机械与物理研究所 | Total reflection type afocal optical system |
| CN113126270A (en) * | 2020-01-15 | 2021-07-16 | 清华大学 | Free-form surface off-axis three-mirror imaging system |
| CN113238368A (en) * | 2021-05-18 | 2021-08-10 | 合肥综合性国家科学中心能源研究院(安徽省能源实验室) | Folding-axis three-reflection telescope objective lens without secondary blocking surface view field |
| US20210263292A1 (en) * | 2018-06-27 | 2021-08-26 | Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno | A focal in-field pointing telescope system |
| CN113568151A (en) * | 2021-07-27 | 2021-10-29 | 西安航空学院 | Large-caliber splicing primary mirror optical system for realizing high resolution |
| CN113625458A (en) * | 2021-09-13 | 2021-11-09 | 北京理工大学 | Double confocal reflection type zoom beam expander |
| CN114660792A (en) * | 2022-02-14 | 2022-06-24 | 成都浩孚科技有限公司 | Reflection type afocal optical system |
| US11635611B2 (en) | 2020-01-15 | 2023-04-25 | Tsinghua University | Freeform surface optical telescope imaging system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111367067A (en) * | 2018-12-25 | 2020-07-03 | 中国科学院长春光学精密机械与物理研究所 | Total reflection type afocal optical system |
| CN111367067B (en) * | 2018-12-25 | 2020-12-11 | 中国科学院长春光学精密机械与物理研究所 | Total reflection type afocal optical system |
| US11635611B2 (en) | 2020-01-15 | 2023-04-25 | Tsinghua University | Freeform surface optical telescope imaging system |
| CN113126270B (en) * | 2020-01-15 | 2022-04-22 | 清华大学 | Free-form surface off-axis three-mirror imaging system |
| US11650402B2 (en) | 2020-01-15 | 2023-05-16 | Tsinghua University | Freeform surface off-axial three-mirror imaging system |
| CN113126270A (en) * | 2020-01-15 | 2021-07-16 | 清华大学 | Free-form surface off-axis three-mirror imaging system |
| CN113238368B (en) * | 2021-05-18 | 2023-08-25 | 合肥综合性国家科学中心能源研究院(安徽省能源实验室) | Non-secondary blocking surface view field folded-axis three-mirror telescope objective lens |
| CN113238368A (en) * | 2021-05-18 | 2021-08-10 | 合肥综合性国家科学中心能源研究院(安徽省能源实验室) | Folding-axis three-reflection telescope objective lens without secondary blocking surface view field |
| CN113568151A (en) * | 2021-07-27 | 2021-10-29 | 西安航空学院 | Large-caliber splicing primary mirror optical system for realizing high resolution |
| CN113625458A (en) * | 2021-09-13 | 2021-11-09 | 北京理工大学 | Double confocal reflection type zoom beam expander |
| CN114660792A (en) * | 2022-02-14 | 2022-06-24 | 成都浩孚科技有限公司 | Reflection type afocal optical system |
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