CN105319669B - A kind of two-waveband infrared optical system - Google Patents
A kind of two-waveband infrared optical system Download PDFInfo
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- CN105319669B CN105319669B CN201510873923.2A CN201510873923A CN105319669B CN 105319669 B CN105319669 B CN 105319669B CN 201510873923 A CN201510873923 A CN 201510873923A CN 105319669 B CN105319669 B CN 105319669B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/08—Anamorphotic objectives
- G02B13/12—Anamorphotic objectives with variable magnification
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The invention discloses a kind of two-waveband infrared optical system, including the first lens, the second lens, the 3rd lens, diaphragm, the 4th lens, the 5th lens and the 6th lens sequentially coaxially set along light incident direction；First lens and the 5th lens are bent moon negative lens, and the second lens, the 3rd lens and the 4th lens are bent moon positive lens, and the 6th lens are biconvex positive lens；The rear surface of 3rd lens and the preceding surface of the 4th lens are aspherical, and remaining lens surface is sphere；First lens, the material of the second lens are germanium, and the 3rd lens, the 4th lens, the material of the 6th lens are chalcogenide glass, and the material of the 5th lens is zinc selenide.The system realizes dual-waveband imaging using chalcogenide glass, while solves the Correction Problemss of axial chromatic aberration and spherical aberration in middle long wave broadband infrared optical system, improves the recognition efficiency of target, reduces false alarm rate；The system architecture is compact, and transmitance is high；Ray machine adjustment is convenient, is adapted to popularization and application.
Description
Technical field
The invention belongs to technical field of optical, and in particular to a kind of two-waveband infrared optical system.
Background technology
Difference of the infrared imaging based on target Yu background radiation degree, by passively receiving the radiation of target and background, through light
The means such as electric conversion, Electric signal processing, video image is converted into by the temperature distribution image of target object.Air is to infra-red radiation
Absorption, mainly have three important atmospheric windows, be distributed in 0.75-2.5 μm of near-infrared, 3-5 μm of medium-wave infrared and 8-
In 14 μm three wavelength bands of LONG WAVE INFRARED.The wave band of traditional infrared imaging system general work is narrower, the information of acquisition
Measure it is limited, and combine each wave band imaging characteristicses, work in multiple wave bands infrared optical system can obtain fully it is useful
Information, effectively object can be identified from substantial amounts of image, target identification detection in can play act foot
The status of weight.Uncooled infrared camera due to be not required to refrigeration and it is cheap, in electric power, fire-fighting, industry, medical treatment, peace
It is anti-to wait civil area application very extensive.Infrared optical system plays very important effect in non-brake method thermal imaging system, all kinds of
Camera lens has been widely applied, and but lacks non-refrigerated two-band optical lens, therefore, to non-refrigerated two-band infrared optics system
The research of system is just especially aobvious important.
Dual-waveband imaging system can generally be realized in two ways：First, respond the detection of different-waveband respectively with two
The mode of device, altogether object lens path-splitting；Second, with a detector that can respond two wave bands, light path system is formed altogether.Prior art
In, CN104238099A discloses a kind of big zoom ratio infrared double-waveband Shared aperture co-variation focus optical system, including along optical axis side
To set gradually it is public before fixed group, the public zoom group that can be axially moveable, public compensation group, it is public after fixed group with
And the first Amici prism for reflecting LONG WAVE INFRARED light, transmiting medium-wave infrared light；Set on the reflected light path of first Amici prism
Group is fixed after being equipped with LONG WAVE INFRARED light, reflected light is imaged by long wave non-brake method receiving device；The transmitted light path of first Amici prism
On be provided with medium-wave infrared focal length compensation group and medium-wave infrared light after fix group, transmitted light is by medium-wave infrared non-brake method receiving device
Imaging.During continuous vari-focus, two waveband corresponds to focal length difference and is less than its depth of focus, two waveband target the two waveband optical system
Information can be received by same system, it is not necessary to which light path switches；But it can only use part to be total to light path system, add system
Volume, weight and size.Such as using detector that can respond two wave bands light path system altogether, then prior art can not gram
Take the Correction Problemss of the aberration aberration of optical system.
The content of the invention
It is an object of the invention to provide a kind of two-waveband infrared optical system, meets system simultaneously in middle two wave bands of long wave
Imaging and aberration correction aberration requirement, realize the design of light path broadband infrared optical system altogether.
In order to realize the above object the technical solution adopted in the present invention is：
A kind of two-waveband infrared optical system, including sequentially coaxially set (from the object side to the image side) along light incident direction
One lens, the second lens, the 3rd lens, diaphragm, the 4th lens, the 5th lens and the 6th lens；First lens and the 5th
Lens are bent moon negative lens, and the second lens, the 3rd lens and the 4th lens are bent moon positive lens, and the 6th lens are that biconvex is just saturating
Mirror；The rear surface of 3rd lens and the preceding surface of the 4th lens are aspherical, and remaining lens surface is sphere；Described
One lens, the material of the second lens are germanium, and the 3rd lens, the 4th lens, the material of the 6th lens are chalcogenide glass, the 5th lens
Material be zinc selenide.
In the two-waveband infrared optical system material therefor of the present invention, germanium has high index of refraction, surface minimum curvature and color
The small characteristic of difference, it is suitable for the near infrared band in 2~16 μm of regions.Zinc selenide has very high in the mu m waveband of 600nm~16
Transmitance, and absorptivity is low.Chalcogenide glass is a kind of amorphous state optical material using chalcogens such as sulphur, selenium or telluriums as matrix,
With excellent saturating infrared and athermal performance.
The two-waveband infrared optical system of the present invention, middle long wave optical system is using aperture transmission formula design altogether, using three
The infra-red materials (germanium, zinc selenide, chalcogenide glass) of kind different aberration systems realizes the chromatic aberration correction of two waveband, by chalcogenide glass
It is introduced into the design of LONG WAVE INFRARED optical system, use is aspherical, meets the imaging and correction of system simultaneously in two wave bands
The requirement of aberration aberration, realize the design of broadband infrared optical system.
First lens and the second lens separation 12.4mm, the second lens and the 3rd lens separation 9.2mm, the 3rd lens
With diaphragm interval 3.6mm, diaphragm and the 4th lens separation 1.5mm, the 4th lens and the 5th lens separation 0.3mm, the 5th lens
With the 6th lens separation 4.6mm.
Described two-waveband infrared optical system, along light incident direction (from the object side to the image side), the preceding surface of the first lens
Be convex to object space, rear surface concaves towards image space, the preceding surfaces of the second lens concaves towards object space, rear surface is convex to image space, before the 3rd lens
Surface is convex to object space, rear surface concaves towards image space, and the preceding surfaces of the 4th lens concaves towards object space, rear surface is convex to image space, the 5th lens
Preceding surface be convex to object space, rear surface concaves towards image space, the preceding surfaces of the 6th lens is convex to object space, rear surface is convex to image space.
Wherein, the diaphragm is circular hole diaphragm.
Described two-waveband infrared optical system, in addition to it is arranged on along light incident direction the detection at the 6th lens rear
Device.
The detector is non-brake method double-color detector.Described non-brake method double-color detector refers to medium-wave infrared and long wave
Infrared double-waveband uncooled detector；The detector is the confocal surface detector of long wave in non-brake method, and optical system is simultaneously to medium wave
It is imaged on long wave on detector focal plane.
The focal plane interval 10.8mm of 6th lens and detector.
Parallel flat is additionally provided between 6th lens and detector.
The material of the parallel flat is germanium.
The present invention two-waveband infrared optical system, external scene radiation through the first lens, the second lens, the 3rd lens,
Diaphragm (circular hole), the 4th lens, the 5th lens, on the 6th lens focus to the focal plane of detector.
The service band of above-mentioned infrared optical system is：3.7 μm~4.8 μm of medium wave wavelength, the μ of long wavelength 8 μm~12
m。
The two-waveband infrared optical system of the present invention, including first, second, the sequentially coaxially set along light incident direction
Three lens, diaphragm, the 4th lens, the 5th lens and the 6th lens, wherein the material of the three, the four, the 6th lens is sulphur system glass
Glass；The infrared optical system has the following advantages that：
1) dual-waveband imaging is realized using chalcogenide glass material, chalcogenide glass has less refractive index and temperature coefficient,
The effectively aberration of correction optical system；
2) color of two waveband is realized using the infra-red material (germanium, zinc selenide, chalcogenide glass) of three kinds of different aberration systems
Difference correction, make two infrared band imagings of the system alignment/long wave, overcome the limitation that single wave band infrared system obtains information
Property, while solve the Correction Problemss of axial chromatic aberration and spherical aberration in middle long wave broadband infrared optical system, improve target
Recognition efficiency, reduce false alarm rate；
3) structure simplifies：System uses six-element lens, and introducing two is aspherical, and remaining is sphere, greatly reduces work
Skill requirement, compact-sized, transmitance is high；
4) aspheric design increases the selectable variable of optimization design, and aberration design is easily obtained excellent as matter；
5) ray machine adjustment is convenient：Part in the system light path is fixed component, and adjustment is simple, is largely reduced
The resetting difficulty of system, it is adapted to popularization and application.
Brief description of the drawings
Fig. 1 is the index path of the two-waveband infrared optical system of embodiment 1.
Embodiment
With reference to embodiment, the present invention is further illustrated.
In embodiment, chalcogenide glass IG4 used is the IG P series glass production of German Vitron Gmbh companies production
Product.
Embodiment 1
The non-refrigerated two-band infrared optical system of the present embodiment, as shown in figure 1, including along light incident direction sequentially coaxially
It is the first lens 1 for setting, the second lens 2, the 3rd lens 3, diaphragm 4, the 4th lens 5, the 5th lens 6, the 6th lens 7, parallel
Flat board 9 and detector 8；The lens 6 of first lens 1 and the 5th are bent moon negative lens, the second lens 2, the 3rd lens 3 and the 4th
Lens 5 are bent moon positive lens, and the 6th lens 7 are biconvex positive lens；Before the rear surface of 3rd lens 3 and the 4th lens 5
Surface is aspherical, and remaining lens surface is sphere.
First lens 1, the material of the second lens 2 are germanium, the 3rd lens 3, the 4th lens 5, the material of the 6th lens 7
For chalcogenide glass IG4, the material of the 5th lens 6 is zinc selenide.The detector is non-brake method double-color detector.Described non-system
Cold double-color detector refers to medium-wave infrared and LONG WAVE INFRARED two waveband uncooled detector；The detector is that long wave is total in non-brake method
Focal plane detector, optical system are imaged on detector focal plane to medium wave and long wave simultaneously.
First lens and the second lens separation 12.4mm, the second lens and the 3rd lens separation 9.2mm, the 3rd lens
With diaphragm interval 3.6mm, diaphragm and the 4th lens separation 1.5mm, the 4th lens and the 5th lens separation 0.3mm, the 5th lens
With the 6th lens separation 4.6mm, the focal plane interval 10.8mm of the 6th lens and detector.
The design parameter of the infrared optical system is as shown in table 1.
The design parameter table of the non-refrigerated two-band infrared optical system of the embodiment 1 of table 1
Note：A, B, C, D are asphericity coefficient in upper table.
Aspherical general type is：
Wherein, c=1/R is vertex curvature, and K is conic constant, and A, B, C, D are high order aspheric surface coefficient；Section 1
For in general Quadratic Surface Equation, aspherical general type is to add high-order term based on conic section；K=0 represents the
The Quadratic Surface Equation of one is sphere；Aspherical radius is the radius of curvature of apex in form.
External scene radiation is through the first lens 1, the second lens 2, the 3rd lens 3, diaphragm 4 (circular hole), the 4th lens 5, the
Five lens 6, the 6th lens 7 are focused on the focal plane of detector 8.
The service band of the non-refrigerated two-band infrared optical system of the present embodiment is：3.7 μm~4.8 μm of medium wave wavelength,
8 μm~12 μm of long wavelength.
In other embodiments of the invention, the parallel flat to shield can be also saved, the infrared optical system
Imaging effect is the same as embodiment 1.
Claims (9)
- A kind of 1. two-waveband infrared optical system, it is characterised in that：First including sequentially coaxially being set along light incident direction is saturating Mirror, the second lens, the 3rd lens, diaphragm, the 4th lens, the 5th lens and the 6th lens；First lens and the 5th lens For bent moon negative lens, the second lens, the 3rd lens and the 4th lens are bent moon positive lens, and the 6th lens are biconvex positive lens；Institute It is aspherical to state the rear surface of the 3rd lens and the preceding surface of the 4th lens, and remaining lens surface is sphere；Described first is saturating Mirror, the material of the second lens are germanium, and the 3rd lens, the 4th lens, the material of the 6th lens are chalcogenide glass, the material of the 5th lens Expect for zinc selenide.
- 2. two-waveband infrared optical system according to claim 1, it is characterised in that：First lens and the second lens It is spaced 12.4mm, the second lens and the 3rd lens separation 9.2mm, the 3rd lens and diaphragm interval 3.6mm, diaphragm and the 4th lens It is spaced 1.5mm, the 4th lens and the 5th lens separation 0.3mm, the 5th lens and the 6th lens separation 4.6mm.
- 3. two-waveband infrared optical system according to claim 1, it is characterised in that：Along light incident direction, the first lens Preceding surface be convex to object space, rear surface concaves towards image space, the preceding surfaces of the second lens concaves towards object space, rear surface is convex to image space, the 3rd The preceding surface of lens is convex to object space, rear surface concaves towards image space, and the preceding surfaces of the 4th lens concaves towards object space, rear surface is convex to image space, The preceding surface of 5th lens is convex to object space, rear surface concaves towards image space, and the preceding surfaces of the 6th lens is convex to object space, rear surface is convex to picture Side.
- 4. two-waveband infrared optical system according to claim 1, it is characterised in that：Also include setting along light incident direction Detector at the 6th lens rear.
- 5. two-waveband infrared optical system according to claim 4, it is characterised in that：The detector is that non-brake method is double-colored Detector.
- 6. two-waveband infrared optical system according to claim 5, it is characterised in that：6th lens and detector Focal plane interval 10.8mm.
- 7. two-waveband infrared optical system according to claim 4, it is characterised in that：6th lens and detector it Between be additionally provided with parallel flat.
- 8. two-waveband infrared optical system according to claim 7, it is characterised in that：The material of the parallel flat is Germanium.
- 9. according to the two-waveband infrared optical system any one of claim 1-8, it is characterised in that：The infrared optics system The service band of system is：3.7 μm~4.8 μm of medium wave wavelength, 8 μm~12 μm of long wavelength.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510873923.2A CN105319669B (en) | 2015-12-02 | 2015-12-02 | A kind of two-waveband infrared optical system |
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| CN201510873923.2A CN105319669B (en) | 2015-12-02 | 2015-12-02 | A kind of two-waveband infrared optical system |
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| CN105319669A CN105319669A (en) | 2016-02-10 |
| CN105319669B true CN105319669B (en) | 2017-12-26 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107305274B (en) * | 2016-04-22 | 2019-04-12 | 大立光电股份有限公司 | Imaging optical system microscope group, image-taking device and electronic device |
| CN108152937B (en) * | 2017-11-13 | 2020-04-14 | 长春理工大学 | Infrared medium/long wave zooming projection lens |
| CN110398832A (en) * | 2019-07-11 | 2019-11-01 | 长春理工大学 | Near-infrared and LONG WAVE INFRARED two waveband microcobjective |
| CN112684595B (en) * | 2020-11-12 | 2022-03-29 | 南京波长光电科技股份有限公司 | Ultra-large aperture wide-angle medium wave refrigeration infrared optical system |
| CN112629669B (en) * | 2020-12-24 | 2021-12-31 | 西安中科立德红外科技有限公司 | Optical athermal infrared lens with two wave bands, common caliber and large target surface and optical system |
| CN114089511B (en) * | 2021-11-26 | 2024-01-16 | 湖北久之洋红外系统股份有限公司 | Very wide band transmission type telescopic optical system |
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| US6423969B1 (en) * | 1994-09-22 | 2002-07-23 | Lockheed Martin Corporation | Dual infrared band objective lens |
| US7369303B2 (en) * | 2006-02-03 | 2008-05-06 | Janos Technology Inc. | Dual band lens system incorporating molded chalcogenide |
| CN202794679U (en) * | 2012-04-24 | 2013-03-13 | 中国电子科技集团公司第十一研究所 | Infrared double waveband confocal optical system and confocal plane infrared double waveband detector |
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