CN106405801A - Apochromatic optical system and application for 1-2.5 [mu]m short infrared waveband - Google Patents
Apochromatic optical system and application for 1-2.5 [mu]m short infrared waveband Download PDFInfo
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- CN106405801A CN106405801A CN201610825621.2A CN201610825621A CN106405801A CN 106405801 A CN106405801 A CN 106405801A CN 201610825621 A CN201610825621 A CN 201610825621A CN 106405801 A CN106405801 A CN 106405801A
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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
- G02B13/16—Optical objectives specially designed for the purposes specified below for use in conjunction with image converters or intensifiers, or for use with projectors, e.g. objectives for projection TV
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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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Abstract
The invention discloses an apochromatic optical system and application for the 1-2.5 [mu]m short infrared waveband. The optical system is formed by a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a detector window 6 and a mirror surface 7 from the object side to the image side sequentially. The front surface of the first lens 1 is an aperture diaphragm of the optical system. A beam from the object side passes through the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5 and the detector window 6 to generate an image on the mirror surface 7. The optical system has a simple and compact structure, is easy to achieve processing, mounting and adjusting, and only adopts two materials, BAF2 and SF6, which both are of spherical surface types and achieve the effect of an apochromatic design.
Description
Technical field
The present invention relates to complex achromatic optical system technical field, more particularly, to one kind are used for 1～2.5 μm of short infrared band
Complex achromatic optical system and application.
Background technology
Night fighting has become as a kind of principal mode of modern local war.Rely on substantial amounts of infrared night vision equipment, army obtains
Obtained " one-way transparent " in battlefield, thus grasping the initiative of war.The demand pull of the war development of infrared imagery technique,
The development of infrared imagery technique promotes High-technology local war to the transformation of information-based local war again, and becomes information-based war
Strive a kind of main sensors technology being relied on.
The property of long wave, medium wave and short wave infrared radiation is different, using corresponding three " atmospheric windows " in military affairs
Infrared imagery technique, is remarkably improved the detection to target and recognition capability.Short-wave infrared system is operate on 1～2.5 μm
Infrared band, and the sun and star have very strong transmitting in this wave band.It is anti-that short-wave infrared imaging mainly uses room temperature scenery
The short wave infrared radiation characteristic penetrated and launch, to realize detecting, can make up the deficiency of middle LONG WAVE INFRARED night vision, fill up shortwave red
The utilization of outer atmospheric window is blank, and this is significant for the information in infrared band Overall Acquisition target.
The achromat-design of infrared imaging optical system is directly connected to the quality of image quality.Short-wave infrared relative bandwidth
In being far longer than, LONG WAVE INFRARED and visible ray, its achromatism degree of difficulty also will be far longer than other wavelength band, therefore light
System will be imaged in short-wave infrared, is considered as the impact to image quality for the optical system aberration first.Total-reflection type light
System does not introduce aberration, but optical system structure is more complicated, and process and assemble is all very difficult.Refractive optical system is by rolling over
Penetrate lens and introduce aberration, but spherical surface type can be adopted, process and assemble is easier to it is therefore desirable to take some technological means to make
The aberration of system is corrected, thus realizing short-wave infrared imaging.
The Chinese patent application of Application No. CN201610526847.2 discloses a kind of multiple colour killing of short-wave infrared broadband
Difference image space telecentricity telephotolens.It is coaxial transmission type optical system, and service band is 1.0～2.5 μm, saturating including eight pieces of spheres
Mirror, along light incident direction, be followed successively by three pieces of positive meniscus lens, one piece of diverging meniscus lens, one piece of double-concave negative lens, one piece just curved
Month lens and two pieces of biconvex positive lens, diaphragm is located at the 4th piece and the 5th piece of lens between, and the first seven block lens all bends towards diaphragm, the
Eight pieces of lens make image space chief ray impinge perpendicularly in image planes parallel to optical axis.This optical system employs eight pieces of lens and three kinds
Material, processing cost is higher, and relative aperture maximum only 1/2.6, focal length is only 10mm, and this telephotolens is applied to 100
Imaging demand within rice, but it is difficult to meet the imaging demand of long-range detection.
Content of the invention
For the deficiencies in the prior art, the invention discloses a kind of apochromatism light for 1～2.5 μm of short infrared band
System and application.Described optical system is mated with thermoelectric cooling type short-wave infrared detector, and this system has only used bi-material,
Five global face eyeglass compositions, structure is simple, debugs easily.
Technical scheme is as follows：A kind of apochromatism optical system for 1～2.5 μm short infrared band imaging
System, described optical system from object space to image space in order by the first lens 1, the second lens 2, the 3rd lens 3, the 4th lens 4, the
Five lens 5, detector window 6 and minute surface 7 form；Described first lens 1 front surface is the aperture diaphragm of optical system, from thing
The light beam of side passes sequentially through the first lens 1, the second lens 2, the 3rd lens 3, the 4th lens 4, the 5th lens 5 and detector window
6 are imaged in image planes 7；
Five power of lens are followed successively by：Just, positive and negative, just, just, the first lens 1 bend towards image space, and the second lens 2 bend towards
Image space, the 3rd lens 3 are biconcave lens, and the 4th lens 4 bend towards object space, and the 5th lens 5 bend towards image space, the forward and backward table of five lens
Face is sphere.
Described first lens 1, the second lens 2 and the 3rd lens 3 are made by barium fluoride BAF2 material, the 4th lens 4 He
5th lens 5 are made by flint glass SF6 material, and detector window 6 is by sapphire Al2O3Material is made.
Described first lens 1, the second lens 2 and the 3rd lens 3 constitute the front lens group with negative power, and the 4th
Lens 4 and the 5th lens 5 constitute the rear lenses group with positive light coke, and front lens group and rear lenses group collectively constitute
The structural shape of telephotography.
Further, the radius of curvature of described first lens 1 front surface is 56.74～85.10mm, effective hole of front surface
Footpath is 81～99mm, and the thickness of front surface is 16.83～20.7mm；The radius of curvature on described first lens (1) surface afterwards is
601.28～901.92mm, the effective aperture on rear surface is 70.8～106.2mm, the thickness on rear surface is 37.98～
46.42mm.
Further, the radius of curvature of described second lens 2 front surface is 48.72～73.08mm, effective hole of front surface
Footpath is 54.72～66.88mm, and the thickness of front surface is 9.36～11.44mm；The curvature half on described second lens (2) surface afterwards
Footpath is 358.16～537.24mm, and the effective aperture on rear surface is 52.2～63.8mm, the thickness on rear surface is 3.87～
4.73mm.
Further, the radius of curvature of described 3rd lens 3 front surface is -165.26～-110.18mm, the having of front surface
Effect aperture is 51.66～63.14mm, and the thickness of front surface is 4.5～5.5mm；The curvature half on described 3rd lens (3) surface afterwards
Footpath is 110.18～165.26mm, and the effective aperture on rear surface is 48.33～59.07mm, the thickness on rear surface is 76.56～
93.58mm.
Further, the radius of curvature of described 4th lens 4 front surface be -26.14～-17.42mm, front surface effective
Aperture is 22.05～26.95mm, and the thickness of front surface is 4.5～5.5mm；The radius of curvature on described 4th lens (4) surface afterwards
For -26.44～-21.64mm, the effective aperture on rear surface is 23.67～28.93mm, and the thickness on rear surface is 0～2mm.
Further, the radius of curvature of described 5th lens 5 front surface is 21.63～32.45mm, effective hole of front surface
Footpath is 21.6～26.4mm, and the thickness of front surface is 4.5～5.5mm；After described 5th lens 5, the radius of curvature on surface is
29.52～44.28mm, the effective aperture on rear surface is 19.8～24.2mm, and the thickness on rear surface is 13.14～16.06mm.
The present invention also provides the described complex achromatic optical system for 1～2.5 μm short infrared band imaging to detect in night vision
Look into the application during equipment, military camouflage painting identification and LASER Light Source detect.
The present invention provides a kind of five refraction type short-wave infrared optical systems, under the theoretical guidance of aberration, for available
Optical material abbe number (Abbe number) in short-wave infrared etc. is analyzed comparing, and therefrom have selected one group can expire to greatest extent
The achromatic combination of materials of foot, i.e. BAF2 and SF6 bi-material combination, by reasonable distribution focal power, the present invention adopts dispersion
Little BAF2 material makees positive lens, and the big SF6 material of dispersion makees negative lens, and the system aberration of making is corrected it is adaptable to 10 very well
Remote imaging more than kilometer.Light system peripheral field at detector centre frequency 16.7lp/mm for the described system passes
Delivery function value reaches more than 70%, and the root mean square radii of each visual field point range figure is respectively less than 8 μm, i.e. each visual field point range figure disc of confusion
It is respectively positioned in the single pixel of 30 μm of sizes of detector, it is thus regarded that this optical system has reached short-wave infrared apochromatism (school
The design of just second order spectrum is referred to as apochromatism design) result, and as matter is close to diffraction limit, image quality is good.
Compared with prior art, the invention has the advantages that：The optical system structure that the present invention provides is simple, tight
Gather, process, debug and be easier to realize, optical system only with bi-material BAF2 and SF6, all spherical surface types, that is, reaches
The effect of apochromatism design is it is adaptable to the imaging of short infrared remote.
Brief description
Fig. 1 is an embodiment of the present invention light system structural representation；
In Fig. 1,1 represents the first lens, and 2 represent the second lens, and 3 represent the 3rd lens, and 4 represent the 4th lens, 5- the 5th
Lens, 6- detector window, 7- minute surface (focal plane).
Specific embodiment
With specific embodiment, technical scheme is described in further details below in conjunction with the accompanying drawings.
Fig. 1 is the short-wave infrared five chip optical system most preferred embodiment structural representation designed by the present invention.Described system
System design wave band is 1 μm～2.5 μm, clear aperture：ф 90mm, visual field：3 ° × 2.4 °, system focal is the infrared system of 180mm
System.
Optical system specific design parameter is as shown in table 1.
Table 1
S1-1 represents the first lens front surface, and S1-2 represents surface after the first lens, and S2-1 represents the second lens front surface,
S2-2 represents surface after the second lens, and S3-1 represents the 3rd lens front surface, and S3-2 represents surface after the 3rd lens, and S4-1 represents
4th lens front surface, S4-2 represents surface after the 4th lens, and S5-1 represents the 5th lens front surface, and S5-2 represents the 5th lens
Surface afterwards, S6-1 represents detector window front surface, and S6-2 represents surface after detector window.
Described five power of lens are followed successively by：Just, positive and negative, just, just, the first lens 1 bend towards image space, the second lens 2
Bend towards image space, the 3rd lens 3 are biconcave lens, and the 4th lens 4 bend towards object space, and the 5th lens 5 bend towards image space, before and after five lens
Surface is sphere.First lens 1, the second lens 2 and the 3rd lens 3 are the spherical lenses that barium fluoride BAF2 material is made,
4th lens 4 and the 5th lens 5 are the spherical lenses that flint glass SF6 material is made, and detector window 6 is sapphire Al2O3Material
Expect the flat board made.
The root mean square point range figure (RMS Spot Radius) of each visual field of optical system and maximum point range that embodiment 1 provides
Figure (Max Spot Radius) is as shown in table 2.
Table 2
As can be seen from Table 2, the point range figure of each visual field is respectively less than 30 μm of pixel dimension, thus obtaining close to diffraction-limited
Image quality.
Embodiment 1 be obtained optical system, full filed disc of confusion RMS value between 2.129 μm～10.762 μm, aberration
Have corrected that very well, mate the detector of 30 μm of pixel dimension completely, image quality is good.
Embodiment 2
On the basis of embodiment 1, combination of materials BAF2-BAF2-BAF2-SF6-SF6 is changed into BAF2-BAF2-
SF6-ZNS-ZNS, thus forming embodiment 2, it is contrasted with the optical system of embodiment 1, as shown in table 3.
Table 3
By the comparison of embodiment 1 and embodiment 2 it is found that the combination of materials of most preferred embodiment 1 is changed shape
The embodiment 2 becoming, achromatism effect reduces, and needs using three kinds of materials, and system complexity improves, and ZNS material therein
Material price is high, and processing cost will be greatly improved.
On the basis of 1 five lens BAF2-BAF2-BAF2-SF6-SF6 material orders of embodiment, if any change
Material category or the order of material, achromatism all reduces, even without achromatism effect.
Claims (9)
1. a kind of complex achromatic optical system for the imaging of 1～2.5 μm short infrared band is it is characterised in that described optical system
System is from object space to image space in order by the first lens (1), the second lens (2), the 3rd lens (3), the 4th lens (4), the 5th saturating
Mirror (5), detector window (6) and minute surface (7) composition；Described first lens (1) front surface is the aperture diaphragm of optical system, comes
Pass sequentially through the first lens (1), the second lens (2), the 3rd lens (3), the 4th lens (4), the 5th lens from the light beam of object space
(5) above it is imaged in image planes (7) with detector window (6)；
Five power of lens are followed successively by：Just, positive and negative, just, just, the first lens (1) bend towards image space, and the second lens (2) bend towards
Image space, the 3rd lens (3) are biconcave lens, and the 4th lens (4) bend towards object space, and the 5th lens (5) bend towards image space, five lens
Forward and backward surface is sphere.
2. the complex achromatic optical system being used for 1～2.5 μm short infrared band imaging as claimed in claim 1, its feature exists
In described first lens (1), the second lens (2) and the 3rd lens (3) are made by barium fluoride BAF2 material, the 4th lens (4)
Make by flint glass SF6 material with the 5th lens (5), detector window (6) is by sapphire Al2O3Material is made.
3. the complex achromatic optical system being used for 1～2.5 μm short infrared band imaging as claimed in claim 1, its feature exists
In, described first lens (1), the second lens (2) and the 3rd lens (3) constitute the front lens group with negative power, the
Four lens (4) and the 5th lens (5) constitute the rear lenses group with positive light coke, and front lens group and rear lenses group are altogether
With the structural shape constituting telephotography.
4. the complex achromatic optical system being used for 1～2.5 μm short infrared band imaging as claimed in claim 1, its feature exists
It is 56.74～85.10mm in the radius of curvature of, described first lens (1) front surface, the effective aperture of front surface is 81～
99mm, the thickness of front surface is 16.83～20.7mm；Described first lens (1) afterwards surface radius of curvature be 601.28～
901.92mm, the effective aperture on rear surface is 70.8～106.2mm, and the thickness on rear surface is 37.98～46.42mm.
5. the complex achromatic optical system being used for 1～2.5 μm short infrared band imaging as claimed in claim 1, its feature exists
It is 48.72～73.08mm in the radius of curvature of, described second lens (2) front surface, the effective aperture of front surface is 54.72～
66.88mm, the thickness of front surface is 9.36～11.44mm；Described second lens (2) afterwards surface radius of curvature be 358.16～
537.24mm, the effective aperture on rear surface is 52.2～63.8mm, and the thickness on rear surface is 3.87～4.73mm.
6. the complex achromatic optical system being used for 1～2.5 μm short infrared band imaging as claimed in claim 1, its feature exists
In the radius of curvature of described 3rd lens (3) front surface is -165.26～-110.18mm, and the effective aperture of front surface is
51.66～63.14mm, the thickness of front surface is 4.5～5.5mm；The radius of curvature on described 3rd lens (3) surface afterwards is
110.18～165.26mm, the effective aperture on rear surface is 48.33～59.07mm, the thickness on rear surface is 76.56～
93.58mm.
7. the complex achromatic optical system being used for 1～2.5 μm short infrared band imaging as claimed in claim 4, its feature exists
In the radius of curvature of described 4th lens (4) front surface is -26.14～-17.42mm, and the effective aperture of front surface is 22.05
～26.95mm, the thickness of front surface is 4.5～5.5mm；Described 4th lens (4) afterwards surface radius of curvature be -26.44～-
21.64mm, the effective aperture on rear surface is 23.67～28.93mm, and the thickness on rear surface is 0～2mm.
8. the complex achromatic optical system being used for 1～2.5 μm short infrared band imaging as claimed in claim 1, its feature exists
It is 21.63～32.45mm in the radius of curvature of, described 5th lens (5) front surface, the effective aperture of front surface is 21.6～
26.4mm, the thickness of front surface is 4.5～5.5mm；Described 5th lens (5) afterwards surface radius of curvature be 29.52～
44.28mm, the effective aperture on rear surface is 19.8～24.2mm, and the thickness on rear surface is 13.14～16.06mm.
9. the described complex achromatic optical system for 1～2.5 μm short infrared band imaging as arbitrary in claim 1～8 exists
The application during equipment, military camouflage painting identification and LASER Light Source detect is investigated in night vision.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610825621.2A CN106405801B (en) | 2016-09-14 | 2016-09-14 | A kind of complex achromatic optical system and application for 1~2.5 μm of short infrared band |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610825621.2A CN106405801B (en) | 2016-09-14 | 2016-09-14 | A kind of complex achromatic optical system and application for 1~2.5 μm of short infrared band |
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| CN106405801B CN106405801B (en) | 2019-01-04 |
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Citations (5)
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| CN103345047A (en) * | 2013-07-10 | 2013-10-09 | 北京空间机电研究所 | Light small-size medium-wave infrared continuous zooming imaging lens |
| CN105137567A (en) * | 2015-08-12 | 2015-12-09 | 北京天诚盛业科技有限公司 | Imaging lens, imaging module and iris recognition device |
| CN105301742A (en) * | 2015-12-05 | 2016-02-03 | 中国航空工业集团公司洛阳电光设备研究所 | High resolution visible light/near infrared common optical path optical system |
| CN205485230U (en) * | 2016-01-28 | 2016-08-17 | 福建福特科光电股份有限公司 | Exempt from dual -purpose camera lens system of day night of confocal design of day night |
| CN105911672A (en) * | 2016-07-06 | 2016-08-31 | 苏州大学 | Short-wave infrared wide-band apochromatism image space telecentric teleobjective |
-
2016
- 2016-09-14 CN CN201610825621.2A patent/CN106405801B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103345047A (en) * | 2013-07-10 | 2013-10-09 | 北京空间机电研究所 | Light small-size medium-wave infrared continuous zooming imaging lens |
| CN105137567A (en) * | 2015-08-12 | 2015-12-09 | 北京天诚盛业科技有限公司 | Imaging lens, imaging module and iris recognition device |
| CN105301742A (en) * | 2015-12-05 | 2016-02-03 | 中国航空工业集团公司洛阳电光设备研究所 | High resolution visible light/near infrared common optical path optical system |
| CN205485230U (en) * | 2016-01-28 | 2016-08-17 | 福建福特科光电股份有限公司 | Exempt from dual -purpose camera lens system of day night of confocal design of day night |
| CN105911672A (en) * | 2016-07-06 | 2016-08-31 | 苏州大学 | Short-wave infrared wide-band apochromatism image space telecentric teleobjective |
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