CN206248908U - The big visual field heavy caliber folding anti-non-focus optical system of axle three of broadband - Google Patents
The big visual field heavy caliber folding anti-non-focus optical system of axle three of broadband Download PDFInfo
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- CN206248908U CN206248908U CN201621208935.XU CN201621208935U CN206248908U CN 206248908 U CN206248908 U CN 206248908U CN 201621208935 U CN201621208935 U CN 201621208935U CN 206248908 U CN206248908 U CN 206248908U
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- axle
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Abstract
The utility model discloses a kind of big visual field heavy caliber folding anti-non-focus optical system of axle three of broadband, for detecting remote, target interior on a large scale, target acquisition distance and detection probability are improved.Parabola principal reflection mirror and hyperboloid secondary mirror composition telephotolens system, the object focus of the speculum of hyperboloid three are overlapped with the rear focus of telephotolens, and entrance pupil is located on principal reflection mirror, and flat scanning mirror is located at the emergent pupil of system.The optical texture that the utility model is provided, by small bias and inclination, to realize being rolled over without the secondary big visual field heavy caliber for blocking the design of the anti-non-focus optical system of axle three.Compared with coaxial system, keep similar mechanical structure, but avoid that three mirrors under big visual field cause it is secondary block, visual field is relative to increase；Compared with traditional off-axis system, its compact conformation, small volume meets system compact, light-weighted requirement；Introduced eccentric and tilt quantity very little, enlargement ratio is larger and MTF is close to diffraction limit.
Description
Technical field
The utility model is related to a kind of big visual field heavy caliber folding anti-non-focus optical system of axle three of broadband, is applicable to the 3rd
For the preposition without burnt telescopic system of forward looking 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 common aperture portion of the afocal system as multi channel imaging system of looking in the distance, entrance pupil is compressed, and is swept
Mechanism is retouched at the emergent pupil, it is reflected go out collimated light 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 adjustable towards visual field
Scope constantly expands；The continuous broadening of detecting band；Detector resolution is improved constantly；The direction of system architecture miniaturization is developed.
At the same time, it is also completely different with earlier generations infrared system, it is desirable to optical system for the design requirement of optical system
System has the wave band of the visual field, big relative aperture and broadening widened.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, the features such as optical system is to realize broadband, heavy caliber, it is often required to introduce special
Different optical material or more complicated structure eliminate the influence of second order spectrum, therefore its application is subject to certain restrictions.Compare
Under, reflective optical system is small to the attenuation ratio transmission material of light and space availability ratio is high entirely without aberration, can be well
Realize broadband, heavy caliber, the application demand of miniaturization.
At present, large-aperture off-axis three-mirror optical system is used mostly both at home and abroad, but there is certain deficiency, such as off axis reflector in it
Although system can avoid it is secondary block, with good picture matter.But for heavy caliber system, it measures larger, multiplying power hardly possible off axis
It is big in doing, and processing cost and resetting difficulty greatly increase.
The content of the invention
The utility model is in view of the shortcomings of the prior art, there is provided one kind is blocked without secondary, wide visual field, times magnification high
Rate, compact conformation, low cost, it is adaptable in the preposition without burnt telescopic system of third generation forward looking infrared system.
To achieve the above object, the technical scheme that the utility model is used is to provide a kind of big visual field heavy caliber of broadband
The folding anti-non-focus optical system of axle three, it includes principal reflection mirror, secondary mirror, three speculums and flat scanning mirror, and described master is anti-
Mirror is penetrated for paraboloidal mirror, secondary mirror is hyperbolic mirror, three speculums are hyperbolic mirror；Described optical system is using in having
Between real image the antistructure of folding axle three, principal reflection mirror, secondary mirror and three speculums are located at different optical axises respectively, and their light is burnt
Degree is just；Principal reflection mirror and secondary mirror constitute telephotolens, and three speculums are collimating mirror；The entrance pupil position of the optical system
In on principal reflection mirror, after the infra-red radiation from target reflects through principal reflection mirror and secondary mirror, in described principal reflection mirror and
Intermediary image is formed between secondary mirror, then after three speculums collimation, the parallel light path emergent pupil of outgoing is located at flat scanning Jing Chu；
The aperture diaphragm of optical system is located on principal reflection mirror.
In technical solutions of the utility model, principal reflection mirror is relative to incident light direction, the extent of the error of principal reflection mirror
20mm~40mm, slant range is 0 °~2 °；Relative to incident light direction, the extent of the error of secondary mirror is 20mm to secondary mirror
~40mm, slant range is 1 °~5 °；Three speculums relative to incident light direction, the extent of the error of three speculums for -55mm~-
30mm, slant range is 5 °~10 °.
When the focal length of described telephotolens system is f1, the focal length of collimating mirror is f2, the light of three anti-non-focus optical systems
Beam compression ratio M=f1/f2.The 1/M of aperture of mirror is reflected based on the optics bore of flat scanning mirror, M is laser beam compression ratio.
The big visual field heavy caliber of broadband described in the utility model rolls over primary mirror, the secondary mirror and three of the anti-non-focus optical system of axle three
Mirror is located at different optical axises respectively, it is adaptable to broader view field imaging.The object lens of optical system and three mirrors are positive light coke, phase
When in a Kepler telescope, and enlargement ratio is 5.5 times.
Compared with prior art, advantage of the present utility model is：
1. optical system realizes that big visual field requires using aspherical, and compact conformation meets system wide visual field and miniaturization
Requirement.
2. optical system is realized without the secondary broadband blocked by carrying out small bias and inclination to each reflecting surface mirror
The big visual field heavy caliber folding anti-non-focus optical system of axle three, is easy to the reception and imaging of follow-up image-forming block.
3. compared with coaxial system, optical system still retains similar structure, but avoids secondary blocking；Visual field is relative can to do
Greatly.
4. compared with traditional off-axis system, the optical system volume that the utility model is provided is smaller；Introducing eccentric and incline
Gradient very little, but reduction magnification is larger.
Brief description of the drawings
Fig. 1 rolls over the knot of the anti-non-focus optical system of axle three for the big visual field heavy caliber of broadband that the utility model embodiment is provided
Structure schematic diagram；
Fig. 2 rolls over the tune of the anti-non-focus optical system of axle three for the big visual field heavy caliber of broadband that the utility model embodiment is provided
Modulation trnasfer function curve map；
Fig. 3 rolls over the point of the anti-non-focus optical system of axle three for the big visual field heavy caliber of broadband that the utility model embodiment is provided
Row figure；
In Fig. 1：1st, principal reflection mirror and entrance pupil position；2nd, secondary mirror；3rd, intermediate image plane；4th, three speculum；5th, plane is swept
Retouch mirror and exit pupil position；6th, perfect lens；7th, preferable image planes.
Specific embodiment
Technical solutions of the utility model are made with reference to the accompanying drawings and examples be further specifically described.
Embodiment 1
The big visual field heavy caliber folding anti-non-focus optical system of axle three of a kind of broadband that the present embodiment is provided, it includes parabola
Principal reflection mirror, hyperboloid secondary mirror, the speculum of hyperboloid three and flat scanning mirror.Three anti-afocal systems are used intermediary image
Folding axle TMA structure types, light pencil is compressed into by the infra-red radiation angle pencil of ray from target, while amplify the angle of visual field, without secondary
The extraction reality emergent pupil for blocking, is easy to the reception and imaging of follow-up image-forming block.
Referring to accompanying drawing 1, it rolls over the anti-non-focus optical system knot of axle three for the big visual field heavy caliber of broadband that the present embodiment is provided
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
Locate the infrared energy of target by after the objective lens parabola principal reflection mirror 1 and hyperboloid secondary mirror 2 of telescope, being formed
The intermediary image 3 of target, its position is in the focus of the speculum 4 of hyperboloid three, then carries out standard to light path by three speculums 4
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, the speculum 4 of secondary mirror 2 and three 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 speculums 4 are collimating mirror, collimating mirror
Focal length is f2, then the laser beam compression without burnt telescope optical system compares M=f1/f2.Reflected based on the optics bore of flat scanning mirror 5
The 1/M of the bore of mirror 1, M are laser beam compression ratio.
For the ease of optical system is analyzed with evaluation, perfect lens group 6 is added in the parallel light path of outgoing, make
On the resonable imagination face 7 of its ideal image.
The anti-non-focus optical system of folding axle three that the present embodiment is provided, MTF is close to diffraction limit.Systematic technical indicator is as follows：
Telescope clear aperture：φ320mm ；
Visual field： 2° ×3.2° ；
Operation wavelength：3 μm~12 μm；
Telescope enlargement ratio：5.5 times.
The characteristics of optical system of the present utility model is maximum is exactly to remain the structure similar with coaxial system at it, is led to
Small bias and inclination is crossed, is realized without the secondary extraction reality emergent pupil for blocking；Realize that big visual field requires using aspherical, structure
It is compact, small volume；And for relative off-axis system, be easy to debug, cost reduction.
What the present embodiment was provided rolls over the anti-non-focus optical system of axle three, its primary structure for the big visual field of broadband to be bigbore
As shown in table 1, the offset of each speculum is as shown in table 2 with tilt quantity for parameter
The anti-afocal system structural parameters of 1 folding axle of table three
| Speculum | 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 lens | -- | 200 | -- | 200 | -- |
Each reflecting surface of table 2 bias and tilt quantity
| Speculum | It is eccentric（mm） | Incline（°） |
| 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 the modulation transfer function of system（MTF）Curve, the weight at 3 μm of wavelength, 7.5 μm, 12 μm
When the factor is 1, sampling number is 64 × 64, the modulation transfer function at optical system ideal image planes（MTF）Curve, such as Fig. 2 institutes
Show.Wherein black line represents diffraction limit MTF curve, and other curves represent the situation of different visual fields, it is seen that as matter close to diffraction pole
Limit.
Referring to accompanying drawing 3, it is the point range figure in ray tracing ideal image plane, and black circles represent Airy disc in figure.Can
See that image patch major part energy is concentrated in Airy disc, show the image quality that the system has had.
Claims (4)
1. a kind of big visual field heavy caliber of broadband rolls over the anti-non-focus optical system of axle three, it is characterised in that it includes principal reflection mirror（1）、
Secondary mirror（2）, three speculums（4）With flat scanning mirror（5）, described principal reflection mirror（1）It is paraboloidal mirror, secondary mirror
（2）It is hyperbolic mirror, three speculums（4）It is hyperbolic mirror；The optical system is using the reef knot of folding axle three with middle real image
Structure, principal reflection mirror（1）, secondary mirror（2）With three speculums（4）Different optical axises is located at respectively, and their focal power is just；
Principal reflection mirror（1）And secondary mirror（2）Constitute telephotolens, three speculums（4）It is collimating mirror；The entrance pupil position of the optical system
In principal reflection mirror（1）On, the infra-red radiation from target is through principal reflection mirror（1）And secondary mirror（2）After reflection, in described master
Speculum（1）And secondary mirror（2）Between form intermediary image（3）, then through three speculums（4）After collimation, the parallel light path of outgoing
Emergent pupil is located at flat scanning mirror（5）Place；The aperture diaphragm of optical system is located at principal reflection mirror（1）On.
2. a kind of big visual field heavy caliber of broadband according to claim 1 rolls over the anti-non-focus optical system of axle three, and its feature exists
In：Described principal reflection mirror（1）Relative to incident light direction, the extent of the error of principal reflection mirror is 20mm~40mm, slant range
It is 0 °~2 °.
3. a kind of big visual field heavy caliber of broadband according to claim 1 rolls over the anti-non-focus optical system of axle three, and its feature exists
In：Described secondary mirror（2）Relative to incident light direction, the extent of the error of secondary mirror is 20mm~40mm, slant range
It is 1 °~5 °.
4. a kind of big visual field heavy caliber of broadband according to claim 1 rolls over the anti-non-focus optical system of axle three, and its feature exists
In：Three described speculums（4）Relative to incident light direction, the extent of the error of three speculums is -55mm~-30mm, inclines model
Enclose is 5 °~10 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621208935.XU CN206248908U (en) | 2016-11-09 | 2016-11-09 | The big visual field heavy caliber folding anti-non-focus optical system of axle three of broadband |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621208935.XU CN206248908U (en) | 2016-11-09 | 2016-11-09 | The big visual field heavy caliber folding anti-non-focus optical system of axle three of broadband |
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| CN206248908U true CN206248908U (en) | 2017-06-13 |
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| CN201621208935.XU Active CN206248908U (en) | 2016-11-09 | 2016-11-09 | The big visual field heavy caliber folding anti-non-focus optical system of axle three of broadband |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107817598A (en) * | 2017-09-29 | 2018-03-20 | 中国科学院长春光学精密机械与物理研究所 | A kind of long-focus Shared aperture reflective optical system |
-
2016
- 2016-11-09 CN CN201621208935.XU patent/CN206248908U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107817598A (en) * | 2017-09-29 | 2018-03-20 | 中国科学院长春光学精密机械与物理研究所 | A kind of long-focus Shared aperture reflective optical system |
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