CN106526817B - A kind of optical path configuration for eliminating the cold picture of infrared continuous zooming optical system - Google Patents
A kind of optical path configuration for eliminating the cold picture of infrared continuous zooming optical system Download PDFInfo
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- CN106526817B CN106526817B CN201611018152.XA CN201611018152A CN106526817B CN 106526817 B CN106526817 B CN 106526817B CN 201611018152 A CN201611018152 A CN 201611018152A CN 106526817 B CN106526817 B CN 106526817B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
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Abstract
The present invention proposes a kind of optical path configuration for eliminating the cold picture of infrared continuous zooming optical system, preceding group of hollow object lens, Zoom lens group, compensate lens group, fixed lens group, convergent lens group, detector forms focal length section continuous zooming optical system, Zoom lens group, compensate lens group, fixed lens group, convergent lens group, detector forms short focus section continuous zooming optical system, Zoom lens group, when compensation lens group is in the position A1B1, constitute focal length segment length coke end optical path, when in the position A2B2, constitute focal length section short focus end optical path, when in the position A3B3, constitute short focus segment length coke end optical path, when in the position A4B4, constitute short focus section short focus end optical path.The present invention is using focal length section and short focus section zonal cooling zoom mode, optical system focal length section is separated with short focus section optical path using preceding group of hollow object lens configuration, realize infrared big zoom ratio continuous zooming optical system, effectively inhibit the section cold emission of optical system short focus, it keeps clear in entire zooming procedure image, obtains excellent image quality.
Description
Technical field
The present invention relates to light path design technical field, specially a kind of light for eliminating the cold picture of infrared continuous zooming optical system
Road configuration.
Background technique
Infrared continuous vari-focus thermal imaging system be a kind of focal length can consecutive variations and image planes position keeps stablizing and in zoom mistake
Image quality keeps good imaging system in journey.Fixed-focus thermal infrared imager is intended to obtain different size of picture in image planes, it is necessary to change
The distance between target object and camera lens or the camera lens for replacing different focal length.And infrared continuous vari-focus thermal imaging system can continuously change
Therefore system focal length can obtain the target picture for continuously changing size, for optical detection and reconnaissance, tracking etc. in image planes
It is all highly beneficial.It is very widely used in the dual-use field such as aerial reconnaissance, electric power, fire-fighting, industry, security protection.
Since high-performance thermal infrared imager generallys use refrigeration mode detector, reflection cool effect is consolidating for refrigeration mode detector
There is phenomenon, therefore to fully consider influence of the reflection cool effect to optical system imaging, otherwise cold emission meeting in system design
Imaging effect generation is seriously affected, system is caused to be unable to normal use.
The implementation of domestic and international infrared continuous vari-focus imaging optical system, generally by preceding fixed lens group, Zoom lens
Group, compensation lens group, rear fixed lens group composition, and using axial zoom mode.All visual fields of optical path configuration share same
A object lens are as reception window.For this configuration in design, the cold emission intensity for sharing object lens is not to the contribution of different visual fields
With, the cold emission intensity for being difficult to combine all visual fields in design reaches the content of system, it will usually cause wide visual field cold
Reflection effect is serious, is difficult to eliminate, and seriously affects the image quality and observing effect of wide visual field.And for photoelectric detecting system,
It usually requires infrared imaging system again according to use demand and has small field of view detection, identification and wide visual field extensive search ability,
This requires must improve or weaken by every means the intensity of cold emission.
Currently, the method for electricity correction is usually taken both at home and abroad to improve or weaken the intensity of cold emission, make up or weaken it
Adverse effect to image, but this method will cause the reduction of Dynamic Range, lose system sensitivity.
Summary of the invention
The object of the present invention is to provide a kind of optical path configurations for eliminating the cold picture of infrared continuous zooming optical system, eliminate cold picture
Influence to optical system can make each optical field of view while have high image quality and effect.
The technical scheme is that：
A kind of optical path configuration for eliminating the cold picture of infrared continuous zooming optical system, it is characterised in that：It is hollow by preceding group
Object lens (1), Zoom lens group (2), compensation lens group (3), fixed lens group (4), convergent lens group (5), detector (6) group
At；Using focal length section and short focus section zonal cooling zoom mode, wherein when focal length section continuous vari-focus before organize hollow object lens (1), become
Times lens group (2), compensation lens group (3), fixed lens group (4), convergent lens group (5), detector (6) are in the optical path；When
When short focus section continuous vari-focus, Zoom lens group (2), compensation lens group (3), fixed lens group (4), convergent lens group (5), detection
Device (6) is in optical path；Zoom lens group (2), compensation lens group (3) can be axially moveable, focal length section focal-distance tuning range
It is 12.867mm~34mm for 300mm~480mm, short focus section focal-distance tuning range.
Further preferred embodiment, a kind of optical path configuration for eliminating the cold picture of infrared continuous zooming optical system are special
Sign is：The optical system uses secondary imaging mode, and wherein focal length section continuous zooming optical system F number is 3, short focus Duan Lian
Continuous varifocal optical system F number is 4；Applicable wavelengths are 3 μm~5 μm of medium wave, 8 μm~12 μm of long wave.
Further preferred embodiment, a kind of optical path configuration for eliminating the cold picture of infrared continuous zooming optical system are special
Sign is：Detector (6) is pixel number 320 × 256,30 μm of pixel size of refrigerated infrared focal plane probe.
Further preferred embodiment, a kind of optical path configuration for eliminating the cold picture of infrared continuous zooming optical system are special
Sign is：
The incident radius surface 231.1mm of preceding group of hollow object lens (1) is emitted radius surface 403.5mm, center thickness 15mm；Material
Material uses monocrystalline silicon；
Incident radius surface-the 139.65mm of Zoom lens group (2), exit facet are aspherical, radius 352.0mm, and center is thick
Spend 4mm；Material uses monocrystalline germanium；Focal length is divided between the plane of incidence of Zoom lens group (2) and preceding group of hollow object lens (1) exit facet
Segment length's coke end 140mm, focal length section short focus end 132.4mm, short focus segment length's coke end 108.6mm, short focus section short focus end 20mm；
The plane of incidence for compensating lens group (3) is aspherical, radius 314.6mm, is emitted radius surface -151.5mm, center thickness
7.2mm；Material uses monocrystalline silicon；Focal length section is divided between the plane of incidence and Zoom lens group (2) exit facet of compensation lens group (3)
Focal length end 4mm, focal length section short focus end 21.6mm, short focus segment length's coke end 73.6mm, short focus section short focus end 179mm；
Fixed lens group (4) along the fixed lens of optical routing first, the second fixed lens, third fixed lens group at；Material
Using monocrystalline germanium；Incident radius surface-the 198.43mm of first fixed lens, is emitted radius surface 1300mm, center thickness 4mm；The
Focal length segment length's coke end 52mm, focal length section short focus end are divided between the plane of incidence and compensation lens group (3) exit facet of one fixed lens
42mm, short focus segment length's coke end 28.8mm, short focus section short focus end 12mm；The plane of incidence of second fixed lens is aspherical, radius-
32.73mm is emitted radius surface -32.07mm, center thickness 7mm；Second fixed lens entrance face and the first fixed lens exit facet
Between be divided into 114mm；The plane of incidence of the fixed lens of third is aspherical, radius -42.58mm, is emitted radius surface -42.75mm, in
Heart thickness 4mm；3.3mm is divided between the fixed lens entrance face of third and the second fixed lens exit facet；
Convergent lens group (5) is formed along the first convergent lens of optical routing, the second convergent lens；The incidence of first convergent lens
Radius surface -18.55mm is emitted radius surface -344.88mm, center thickness 7mm；Material uses zinc sulphide；First convergent lens enters
It penetrates between face and the fixed lens exit facet of third and is divided into 51.3mm；The plane of incidence of second convergent lens is aspherical, radius
48.11mm is emitted radius surface -54.05mm, center thickness 4.2mm；Material uses monocrystalline silicon；The second convergent lens plane of incidence with
2mm is divided between first convergent lens exit facet；
7mm is divided between second convergent lens exit facet and detector (6) focal plane.
Beneficial effect
Advantages of the present invention is：
1 without cold picture：
Continuous zooming optical system focal length section is separated with short focus section optical path using the form of preceding group of hollow object lens, from optical path
Influence of the reflection cool effect to short focus section optical system imaging quality is eliminated on configuration.
2 image quality are excellent：
Due to eliminating influence of the cold picture to imaging optical system, the dynamic range of imaging system, picture quality are expanded
It is excellent, and since preceding group of object lens use the form of hollow object lens, so that limitation is reduced when optical system optimizes, it is easier to obtain excellent
Good image quality.
3 transmitances are high：
Since preceding group of object lens use the form of hollow object lens, so that the lens numbers of continuous zooming optical system short focus section subtract
Few, transmitance is improved.
Additional aspect and advantage of the invention will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures
Obviously and it is readily appreciated that, wherein：
Fig. 1 is existing infrared continuous zooming optical system narrow visual field light path schematic diagram,
Fig. 2 is existing infrared continuous zooming optical system wide visual field light path schematic diagram,
Fig. 3 present invention infrared continuous zooming optical system focal length segment length's coke end light path schematic diagram,
Fig. 4 present invention infrared continuous zooming optical system focal length section short focus end light path schematic diagram,
Fig. 5 present invention infrared continuous zooming optical system short focus segment length's coke end light path schematic diagram,
Fig. 6 present invention infrared continuous zooming optical system short focus section short focus end light path schematic diagram.
Specific embodiment
The embodiment of the present invention is described below in detail, the embodiment is exemplary, it is intended to it is used to explain the present invention, and
It is not considered as limiting the invention.
The object of the present invention is to provide a kind of optical path configurations for eliminating the cold picture of infrared continuous zooming optical system, eliminate cold picture
Influence to optical system can make each optical field of view while have high image quality and effect.
Optical system uses the configuration of preceding group of hollow object lens by the way of focal length section and short focus section zonal cooling zoom
Optical system focal length section and the optical path of short focus section are separated, while realizing infrared big zoom ratio continuous zooming optical system,
The cold emission of optical system short focus section is effectively inhibited, optical system keeps clear in entire zooming procedure image, obtains excellent
Good image quality.
Hollow object lens 1 are organized before focal length section continuous zooming optical system, Zoom lens group 2, compensation lens group 3, are fixed thoroughly
Microscope group 4, convergent lens group 5, detector 6 form；It is preceding when Zoom lens group 2, compensation lens group 3 are in the diagram position A1B1
The hollow object lens 1 of group, Zoom lens group 2, compensation lens group 3, fixed lens group 4, convergent lens group 5, detector 6 constitute focal length section
Continuous zooming optical system focal length end optical system light path；When Zoom lens group 2, compensation lens group 3 are axially moveable, in figure
When showing the position A2B2, preceding group of hollow object lens 1, compensation lens group 3, fixed lens group 4, convergent lens group 5, are visited Zoom lens group 2
It surveys device 6 and constitutes focal length section continuous zooming optical system short focus end optical system light path.
Short focus section continuous zooming optical system is with Zoom lens group 2, compensation lens group 3, fixed lens group 4, convergent lens
Group 5, detector 6 form；When Zoom lens group 2, compensation lens group 3 are axially moveable, when in the diagram position A3B3, zoom is saturating
Microscope group 2, compensation lens group 3, fixed lens group 4, convergent lens group 5, the composition short focus section continuous zooming optical system of detector 6 are long
Burnt end optical system light path；When Zoom lens group 2, compensation lens group 3 are axially moveable, when in the diagram position A4B4, zoom
Lens group 2, compensation lens group 3, fixed lens group 4, convergent lens group 5, detector 6 constitute short focus section continuous zooming optical system
Short focus end optical system light path.
Configuration using preceding group of hollow object lens 1 separates optical system focal length section from optical path configuration with the optical path of short focus section
Influence of the reflection cool effect to system is eliminated, which can efficiently solve influence of the cold picture to short focus section image quality,
Image remains the image quality for being clearly effectively guaranteed entire zooming procedure in entire zooming procedure.
Focal length section focal-distance tuning range is 300mm~480mm, short focus section focal-distance tuning range is 12.867mm~34mm,
37 times of zoom ratio；System is by the way of secondary imaging；Focal length section F number is 3, short focus section F number is 4.Applicable detector is picture
Prime number 320 × 256,30 μm of pixel size of refrigerated infrared focal plane probe, applicable wavelengths：3 μm~5 μm, 8 μm of long wave of medium wave
~12 μm.
Specific optical parameter see the table below shown.In order to improve the image quality of each parallax, part aspheric joined in optical path
Face participates in aberration balancing.
Optical parameter table (unit：mm)
The method that optical system of the present invention uses focal length section and short focus section zonal cooling zoom, and use preceding group of hollow object lens
Configuration separate optical system focal length section and the optical path of short focus section, realizing infrared big zoom ratio continuous zooming optical system
Meanwhile the cold emission of optical system short focus section is effectively inhibited, optical system keeps clear in entire zooming procedure image, obtains
Obtain excellent image quality.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art are not departing from the principle of the present invention and objective
In the case where can make changes, modifications, alterations, and variations to the above described embodiments within the scope of the invention.
Claims (4)
1. a kind of optical path configuration for eliminating the cold picture of infrared continuous zooming optical system, it is characterised in that：By preceding group of hollow object lens
(1), Zoom lens group (2), compensation lens group (3), fixed lens group (4), convergent lens group (5), detector (6) composition；It adopts
With focal length section and short focus section zonal cooling zoom mode, wherein when focal length section continuous vari-focus before organize hollow object lens (1), Zoom lens
Group (2), compensation lens group (3), fixed lens group (4), convergent lens group (5), detector (6) are in the optical path；When short focus section
When continuous vari-focus, Zoom lens group (2), compensation lens group (3), fixed lens group (4), convergent lens group (5), detector (6)
In optical path；Zoom lens group (2), compensation lens group (3) can be axially moveable, and focal length section focal-distance tuning range is
300mm~480mm, short focus section focal-distance tuning range are 12.867mm~34mm.
2. a kind of optical path configuration for eliminating the cold picture of infrared continuous zooming optical system according to claim 1, it is characterised in that：
The optical system uses secondary imaging mode, and wherein focal length section continuous zooming optical system F number is 3, short focus section continuous vari-focus
Optical system F number is 4；Applicable wavelengths are 3 μm~5 μm of medium wave, 8 μm~12 μm of long wave.
3. a kind of optical path configuration for eliminating the cold picture of infrared continuous zooming optical system according to claim 1, it is characterised in that：
Detector (6) is pixel number 320 × 256,30 μm of pixel size of refrigerated infrared focal plane probe.
4. a kind of optical path configuration for eliminating the cold picture of infrared continuous zooming optical system according to claim 1, it is characterised in that：
The incident radius surface 231.1mm of preceding group of hollow object lens (1) is emitted radius surface 403.5mm, center thickness 15mm；Material is adopted
Use monocrystalline silicon；
Incident radius surface-the 139.65mm of Zoom lens group (2), exit facet are aspherical, radius 352.0mm, center thickness
4mm；Material uses monocrystalline germanium；Focal length section is divided between the plane of incidence of Zoom lens group (2) and preceding group of hollow object lens (1) exit facet
Focal length end 140mm, focal length section short focus end 132.4mm, short focus segment length's coke end 108.6mm, short focus section short focus end 20mm；
The plane of incidence for compensating lens group (3) is aspherical, radius 314.6mm, is emitted radius surface -151.5mm, center thickness
7.2mm；Material uses monocrystalline silicon；Focal length section is divided between the plane of incidence and Zoom lens group (2) exit facet of compensation lens group (3)
Focal length end 4mm, focal length section short focus end 21.6mm, short focus segment length's coke end 73.6mm, short focus section short focus end 179mm；
Fixed lens group (4) along the fixed lens of optical routing first, the second fixed lens, third fixed lens group at；Material uses
Monocrystalline germanium；Incident radius surface-the 198.43mm of first fixed lens, is emitted radius surface 1300mm, center thickness 4mm；First is solid
It is divided into focal length segment length's coke end 52mm, focal length section short focus end 42mm between the plane of incidence and compensation lens group (3) exit facet of fix-focus lens,
Short focus segment length's coke end 28.8mm, short focus section short focus end 12mm；The plane of incidence of second fixed lens is aspherical, radius-
32.73mm is emitted radius surface -32.07mm, center thickness 7mm；Second fixed lens entrance face and the first fixed lens exit facet
Between be divided into 114mm；The plane of incidence of the fixed lens of third is aspherical, radius -42.58mm, is emitted radius surface -42.75mm, in
Heart thickness 4mm；3.3mm is divided between the fixed lens entrance face of third and the second fixed lens exit facet；
Convergent lens group (5) is formed along the first convergent lens of optical routing, the second convergent lens；The plane of incidence of first convergent lens half
Diameter -18.55mm is emitted radius surface -344.88mm, center thickness 7mm；Material uses zinc sulphide；The first convergent lens plane of incidence
51.3mm is divided between the fixed lens exit facet of third；The plane of incidence of second convergent lens is aspherical, radius 48.11mm,
It is emitted radius surface -54.05mm, center thickness 4.2mm；Material uses monocrystalline silicon；The second convergent lens plane of incidence and first is assembled
2mm is divided between lens exit facet；
7mm is divided between second convergent lens exit facet and detector (6) focal plane.
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| CN107860478B (en) * | 2017-11-17 | 2019-11-22 | 北京长峰科威光电技术有限公司 | A kind of restorative procedure of infrared imaging system cold emission blackspot |
| CN112230405B (en) * | 2020-11-04 | 2022-10-04 | 中国航空工业集团公司洛阳电光设备研究所 | Infrared large-view-field front-free fixed-group zoom optical system for eliminating cold image |
| CN112305732A (en) * | 2020-11-10 | 2021-02-02 | 湖北久之洋红外系统股份有限公司 | Ultra-long focal length high-resolution continuous zooming medium-wave infrared optical system |
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