CN105319669A - Two-wave-band infrared optical system - Google Patents
Two-wave-band infrared optical system Download PDFInfo
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- CN105319669A CN105319669A CN201510873923.2A CN201510873923A CN105319669A CN 105319669 A CN105319669 A CN 105319669A CN 201510873923 A CN201510873923 A CN 201510873923A CN 105319669 A CN105319669 A CN 105319669A
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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 two-wave-band infrared optical system which comprises a first lens, a second lens, a third lens, diaphragm, a fourth lens, a fifth lens and a sixth lens which are coaxially arranged in sequence along the light incidence direction, wherein the first lens and the fifth lens are crescent negative lenses; the second lens, the third lens and the fourth lens are crescent positive lenses; the sixth lens is a biconvex lens; the rear surface of the third lens and the front surface of the fourth lens are nonspherical surfaces, and the surfaces of the other lenses are spherical surfaces; the first lens and the second lens are made from germanium; the third lens, the fourth lens and the sixth lens are made from chalcogenide glass; the fifth lens is made from zinc selenide. The system realizes two-wave-band imaging with the chalcogenide glass; meanwhile, the problem of correction of axial chromatic aberration and spherical aberration in medium and long bandwidth wave-band infrared optical system is solved, the identification efficiency of a target is improved, and the false alarm rate is reduced; the system is compact in structure and high in transmittance; an x ray machine is convenient to assemble and adjust; the two-wave-band infrared optical system is suitable for being popularized and applied.
Description
Technical field
The invention belongs to technical field of optical, be specifically related to a kind of two-waveband infrared optical system.
Background technology
Infrared imaging based target is different from background radiation degree, by the radiation of passive receiving target and background, through the means such as opto-electronic conversion, Electric signal processing, converts the temperature distribution image of target object to video image.Air, to the absorption of infrared radiation, mainly contains three important atmospheric windows, is distributed in LONG WAVE INFRARED three wavelength band of the near infrared of 0.75-2.5 μm, the medium-wave infrared of 3-5 μm and 8-14 μm.The wave band of traditional infrared imaging system general work is narrower, the quantity of information obtained is limited, and fully useful information can be obtained in conjunction with the imaging characteristics of each wave band, the infrared optical system that works in multiple wave band, effectively object can be identified from a large amount of images, very important status can be played in target identification detection.Uncooled infrared camera owing to not needing refrigeration and cheap, in the application of the civil area such as electric power, fire-fighting, industry, medical treatment, security protection widely.Infrared optical system plays very important effect in non-brake method thermal imaging system, and all kinds of camera lens is widely applied, but lacks non-refrigerated two-band optical lens, therefore, just outstanding aobvious important to the research of non-refrigerated two-band infrared optical system.
Dual-waveband imaging system can realize usually in two ways: one is the detector responding different-waveband with two respectively, altogether the mode of object lens path-splitting; Two is the detector light path system formations altogether that can respond two wave bands with.In prior art, CN104238099A discloses a kind of large zoom ratio infrared double-waveband Shared aperture co-variation focus optical system, comprise along optical axis direction set gradually public front fix group, can the public zoom group of movement vertically, public compensation group, public rear fixing group and the first Amici prism for reflect long infrared light, transmission medium-wave infrared light; Fix group after the reflected light path of the first Amici prism being provided with LONG WAVE INFRARED light, reflected light is by the imaging of long wave non-brake method receiving device; Fix group after the transmitted light path of the first Amici prism being provided with medium-wave infrared focal length compensating group and medium-wave infrared light, transmitted light is by the imaging of medium-wave infrared non-brake method receiving device.This two waveband optical system is in continuous vari-focus process, and the corresponding focal length difference of two waveband is less than its depth of focus, and two waveband target information can be received by same system, does not need light path to switch; But it can only adopt part light path system altogether, adds the volume of system, weight and size.As adopted a detector light path system altogether that can respond two wave bands, then prior art cannot overcome the Correction Problems of the aberration aberration of optical system.
Summary of the invention
The object of this invention is to provide a kind of two-waveband infrared optical system, meet the imaging of system and the requirement of aberration correction aberration at middle long wave two wave bands simultaneously, realize the design of light path broadband infrared optical system altogether.
In order to realize above object, the technical solution adopted in the present invention is:
A kind of two-waveband infrared optical system, comprises along light incident direction (from the object side to the image side) successively coaxial the first lens, the second lens, the 3rd lens, diaphragm, the 4th lens, the 5th lens and the 6th lens arranged; Described 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 described 3rd lens and the front surface of the 4th lens are aspheric surface, and all the other lens surfaces are sphere; The material of described first lens, the second lens is germanium, and the material of the 3rd lens, the 4th lens, the 6th lens is chalcogenide glass, and the material of the 5th lens is zinc selenide.
In two-waveband infrared optical system material therefor of the present invention, germanium has the little characteristic of high index of refraction, surperficial minimum curvature and aberration, is suitable for the near-infrared band in 2 ~ 16 μm of regions.Zinc selenide has very high permeability in the mu m waveband of 600nm ~ 16, and absorptivity is low.Chalcogenide glass is a kind of amorphous state optical material being matrix with chalcogens such as sulphur, selenium or telluriums, has the excellent thoroughly infrared and heat difference performance that disappears.
Two-waveband infrared optical system of the present invention, middle long wave optical system adopts aperture transmission formula design altogether, the infra-red material (germanium, zinc selenide, chalcogenide glass) of three kinds of different aberration systems is adopted to realize the chromatic aberration correction of two waveband, by in the design of LONG WAVE INFRARED optical system in chalcogenide glass introducing, adopt aspheric surface, meet the imaging of system and the requirement of aberration correction aberration at two wave bands simultaneously, realize the design of broadband infrared optical system.
Described first lens and the second lens separation 12.4mm, second lens and the 3rd lens separation 9.2mm, 3rd lens and 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 and 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 front surface of the first lens is convex recessed to image space to object space, rear surface, the front surface of the second lens is recessed convex in image space to object space, rear surface, the front surface of the 3rd lens is convex recessed to image space to object space, rear surface, the front surface of the 4th lens is recessed convex in image space to object space, rear surface, the front surface of the 5th lens is convex recessed to image space to object space, rear surface, and the front surface of the 6th lens is convex convex in image space to object space, rear surface.
Wherein, described diaphragm is circular hole diaphragm.
Described two-waveband infrared optical system, also comprises the detector being arranged on the 6th lens rear along light incident direction.
Described detector is non-brake method double-color detector.Described non-brake method double-color detector refers to medium-wave infrared and LONG WAVE INFRARED two waveband uncooled detector; This detector is the confocal surface detector of long wave in non-brake method, and optical system is imaged on detector focal plane medium wave and long wave simultaneously.
Interval, the focal plane 10.8mm of described 6th lens and detector
Described 6th is also provided with parallel flat between lens and detector.
The material of described parallel flat is germanium.
Two-waveband infrared optical system of the present invention, external scene radiation through the first lens, the second lens, the 3rd lens, diaphragm (circular hole), the 4th lens, the 5th lens, the 6th lens focus on the focal plane of detector.
The service band of above-mentioned infrared optical system is: medium wave wavelength 3.7 μm ~ 4.8 μm, long wavelength 8 μm ~ 12 μm.
Two-waveband infrared optical system of the present invention, comprise first, second, third lens, diaphragm, the 4th lens, the 5th lens and the 6th lens that coaxially arrange successively along light incident direction, wherein the material of the 3rd, the 4th, the 6th lens is chalcogenide glass; This infrared optical system tool has the following advantages:
1) use chalcogenide glass material to realize dual-waveband imaging, chalcogenide glass has less refractive index and temperature coefficient, the aberration of effective correcting optical system;
2) infra-red material (germanium, zinc selenide, chalcogenide glass) of three kinds of different aberration systems is adopted to realize the chromatic aberration correction of two waveband, make two the infrared band imagings of this system centering/long wave, overcome the limitation of single wave band infrared system obtaining information, solve the Correction Problems of axial chromatic aberration and spherical aberration in middle long wave broadband infrared optical system simultaneously, improve the recognition efficiency of target, reduce false alarm rate;
3) structure simplifies: system adopts six-element lens, and introduce two aspheric surfaces, all the other are sphere, greatly reduce technological requirement, compact conformation, and transmitance is high;
4) aspheric design makes the selectable variable of optimal design increase, and aberration design is easy to obtain excellent picture element;
5) ray machine is debug conveniently: the parts in this system light path are fixed part, debugs simple, reduces the resetting difficulty of system to a great extent, be applicable to applying.
Accompanying drawing explanation
Fig. 1 is the index path of the two-waveband infrared optical system of embodiment 1.
Embodiment
Below in conjunction with embodiment, the present invention is further illustrated.
In embodiment, chalcogenide glass IG4 used is the IG P series glass product that German VitronGmbh company produces.
Embodiment 1
The non-refrigerated two-band infrared optical system of the present embodiment, as shown in Figure 1, the first lens 1, second lens 2, the 3rd lens 3, diaphragm 4, the 4th lens 5, the 5th lens 6, the 6th lens 7, parallel flat 9 and the detector 8 that coaxially arrange successively along light incident direction is comprised; Described first lens 1 and the 5th lens 6 are bent moon negative lens, and 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; The rear surface of described 3rd lens 3 and the front surface of the 4th lens 5 are aspheric surface, and all the other lens surfaces are sphere.
The material of described first lens 1, second lens 2 is germanium, and the material of the 3rd lens 3, the 4th lens 5, the 6th lens 7 is chalcogenide glass IG4, and the material of the 5th lens 6 is zinc selenide.Described detector is non-brake method double-color detector.Described non-brake method double-color detector refers to medium-wave infrared and LONG WAVE INFRARED two waveband uncooled detector; This detector is the confocal surface detector of long wave in non-brake method, and optical system is imaged on detector focal plane medium wave and long wave simultaneously.
Described first lens and the second lens separation 12.4mm, second lens and the 3rd lens separation 9.2mm, 3rd lens and diaphragm interval 3.6mm, diaphragm and the 4th lens separation 1.5mm, 4th lens and the 5th lens separation 0.3mm, the 5th lens and the 6th lens separation 4.6mm, interval, the focal plane 10.8mm of the 6th lens and detector.
The design parameter of this infrared optical system is as shown in table 1.
The design parameter table of the non-refrigerated two-band infrared optical system of table 1 embodiment 1
Note: in upper table, A, B, C, D are asphericity coefficient.
Aspheric 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 is general Quadratic Surface Equation, and aspheric general type is adding high-order term based on quafric curve; K=0 represents that the Quadratic Surface Equation of Section 1 is sphere; In form, aspheric radius is the radius-of-curvature at summit place.
External scene radiation focuses on the focal plane of detector 8 through the first lens 1, second lens 2, the 3rd lens 3, diaphragm 4 (circular hole), the 4th lens 5, the 5th lens 6, the 6th lens 7.
The service band of the non-refrigerated two-band infrared optical system of the present embodiment is: medium wave wavelength 3.7 μm ~ 4.8 μm, long wavelength 8 μm ~ 12 μm.
In other embodiments of the invention, also can save the parallel flat shielded, the imaging effect of this infrared optical system is with embodiment 1.
Claims (9)
1. a two-waveband infrared optical system, is characterized in that: comprise the first lens, the second lens, the 3rd lens, diaphragm, the 4th lens, the 5th lens and the 6th lens that coaxially arrange successively along light incident direction; Described 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 described 3rd lens and the front surface of the 4th lens are aspheric surface, and all the other lens surfaces are sphere; The material of described first lens, the second lens is germanium, and the material of the 3rd lens, the 4th lens, the 6th lens is chalcogenide glass, and the material of the 5th lens is zinc selenide.
2. two-waveband infrared optical system according to claim 1, it is characterized in that: described first lens and the second lens separation 12.4mm, second lens and the 3rd lens separation 9.2mm, 3rd lens and 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 and the 6th lens separation 4.6mm.
3. two-waveband infrared optical system according to claim 1, it is characterized in that: along light incident direction, the front surface of the first lens is convex recessed to image space to object space, rear surface, the front surface of the second lens is recessed convex in image space to object space, rear surface, the front surface of the 3rd lens is convex recessed to image space to object space, rear surface, the front surface of the 4th lens is recessed convex in image space to object space, rear surface, the front surface of the 5th lens is convex recessed to image space to object space, rear surface, and the front surface of the 6th lens is convex convex in image space to object space, rear surface.
4. two-waveband infrared optical system according to claim 1, is characterized in that: also comprise the detector being arranged on the 6th lens rear along light incident direction.
5. two-waveband infrared optical system according to claim 4, is characterized in that: described detector is non-brake method double-color detector.
6. two-waveband infrared optical system according to claim 5, is characterized in that: interval, the focal plane 10.8mm of described 6th lens and detector.
7. two-waveband infrared optical system according to claim 4, is characterized in that: the described 6th is also provided with parallel flat between lens and detector.
8. two-waveband infrared optical system according to claim 7, is characterized in that: the material of described parallel flat is germanium.
9. the two-waveband infrared optical system according to any one of claim 1-8, is characterized in that: the service band of this infrared optical system is: medium wave wavelength 3.7 μm ~ 4.8 μm, long wavelength 8 μm ~ 12 μm.
Priority Applications (1)
| 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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| 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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| CN105319669A true CN105319669A (en) | 2016-02-10 |
| CN105319669B CN105319669B (en) | 2017-12-26 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107305274A (en) * | 2016-04-22 | 2017-10-31 | 大立光电股份有限公司 | Imaging optical system microscope group, image-taking device and electronic installation |
| CN108152937A (en) * | 2017-11-13 | 2018-06-12 | 长春理工大学 | In infrared/long wave Zooming-projection camera lens |
| CN110398832A (en) * | 2019-07-11 | 2019-11-01 | 长春理工大学 | Near-infrared and LONG WAVE INFRARED two waveband microcobjective |
| CN112629669A (en) * | 2020-12-24 | 2021-04-09 | 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 |
| CN112684595A (en) * | 2020-11-12 | 2021-04-20 | 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 |
| CN114089511A (en) * | 2021-11-26 | 2022-02-25 | 湖北久之洋红外***股份有限公司 | Very wide band transmission type telescopic optical system |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107305274A (en) * | 2016-04-22 | 2017-10-31 | 大立光电股份有限公司 | Imaging optical system microscope group, image-taking device and electronic installation |
| 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 |
| CN108152937A (en) * | 2017-11-13 | 2018-06-12 | 长春理工大学 | In infrared/long wave Zooming-projection camera lens |
| 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 |
| CN112684595A (en) * | 2020-11-12 | 2021-04-20 | 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 |
| CN112629669A (en) * | 2020-12-24 | 2021-04-09 | 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 |
| 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 |
| CN114089511A (en) * | 2021-11-26 | 2022-02-25 | 湖北久之洋红外***股份有限公司 | Very wide band transmission type telescopic optical system |
| CN114089511B (en) * | 2021-11-26 | 2024-01-16 | 湖北久之洋红外***股份有限公司 | Very wide band transmission type telescopic optical system |
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