CN106990517A - A kind of object lens of large relative aperture long-focus uncooled ir is without thermalization optical system - Google Patents
A kind of object lens of large relative aperture long-focus uncooled ir is without thermalization optical system Download PDFInfo
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- 230000003287 optical effect Effects 0.000 title claims abstract description 39
- 238000003384 imaging method Methods 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims description 10
- PFNQVRZLDWYSCW-UHFFFAOYSA-N (fluoren-9-ylideneamino) n-naphthalen-1-ylcarbamate Chemical compound C12=CC=CC=C2C2=CC=CC=C2C1=NOC(=O)NC1=CC=CC2=CC=CC=C12 PFNQVRZLDWYSCW-UHFFFAOYSA-N 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 239000004411 aluminium Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 229910052732 germanium Inorganic materials 0.000 claims description 2
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 238000009738 saturating Methods 0.000 claims 1
- 230000008859 change Effects 0.000 abstract description 8
- 230000004313 glare Effects 0.000 abstract description 5
- 238000005096 rolling process Methods 0.000 abstract description 5
- 238000004939 coking Methods 0.000 abstract description 3
- 239000006185 dispersion Substances 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000007516 diamond turning Methods 0.000 description 2
- 238000003331 infrared imaging Methods 0.000 description 2
- 230000007480 spreading Effects 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 1
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- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/08—Optical arrangements
- G01J5/0808—Convex mirrors
-
- 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
-
- 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
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
-
- 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
- G02B13/008—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras designed for infrared light
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
-
- 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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
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- Spectroscopy & Molecular Physics (AREA)
- Lenses (AREA)
Abstract
A kind of object lens of large relative aperture long-focus uncooled ir is without thermalization optical system, the front of focal plane is arranged on the light direction of propagation, by the principal reflection mirror being coaxially set up in parallel, secondary mirror, the first positive crescent lens, the second positive crescent lens, rolls over/spreads out hybrid lens, movable lens and the second negative crescent lens and constitute.The present invention increases light path by the multiple reflections of light using cassette system, and then realizes the long coking of optical system.ItsF #：1；Focal length：500mm；Central obscuration：≤0.3；Optics overall length and focal distance ratio：≤0.64.By secondary imaging, it can effectively suppress influence of the veiling glare to system imaging quality.The characteristics of there is negative dispersion, negative expansion coefficient using diffraction element, pass through the reasonable distribution for hybrid element focal power of rolling over/spread out, reduce defocusing amount of the infrared optical system caused by temperature change, actively it is combined simultaneously with mechanical without thermalization, realizes image planes defocusing compensation of the system in 40 DEG C to+60 DEG C temperature ranges.
Description
Technical field
The invention belongs to non refrigerating infrared imaging technical field, and in particular to a kind of object lens of large relative aperture long-focus non-brake method is red
It is outer without thermalization optical system.
Background technology
With the progress of technology, the pixel dimension of uncooled ir system constantly reduces, sensitivity is improved constantly, and
Its price is but gradually reduced.In addition, because it does not need refrigeration machine, system reliability is high, miniaturization can be realized, so increasingly
Be widely used in safety monitoring, the field such as vehicle-mounted.
However, the temperature resolution of uncooled ir system is relatively low, detectivity is poor, to improve the temperature resolution of system
Rate and target acquisition ability, it is desirable to which infrared optical system has object lens of large relative aperture and long-focus.
The focal length of existing uncooled ir camera lens is shorter, and the resolution capability to target is relatively low and volume big, weight weight.This hair
It is bright to be to provide a kind of object lens of large relative aperture focal length infrared without thermalization optical system, object lens of large relative aperture, long-focus are realized, while energy
Enough infrared optical systems being imaged in wide temperature range.
It is catadioptric that a kind of large-aperture long-focus is disclosed in the Chinese patent application file of Application No. 201510396800.4
Formula uncooled infrared imaging system, the system does not carry out no thermalized design.In actual applications, it can cause infrared when temperature change
Curvature, thickness, the refractive index of optical element change, the system defocus caused so that the image quality of infrared optical system
Decline the influence for large aperture system imaging quality to be particularly acute, or even be unable to blur-free imaging.In addition, the system is using once
The mode of imaging design can not effectively suppress influence of the veiling glare to optical system imaging.
The content of the invention
In order to solve deficiency of the prior art, the present invention provides a kind of focal length infrared optical system of object lens of large relative aperture,
In the case where system bulk does not increase, light path is increased by the multiple reflections of light using cassette system, and then realize light
The long coking of system, using secondary imaging, veiling glare can be effectively suppressed to system while system front end bore is reduced
The influence of image quality.
To achieve these goals, the concrete scheme that uses of the present invention for：
A kind of object lens of large relative aperture long-focus uncooled ir is arranged at focal plane without thermalization optical system on the light direction of propagation
Front, be made up of the cassette system and secondary imaging system that are coaxially disposed, it is anti-that the cassette system includes the master that is set up in parallel
Mirror and secondary mirror are penetrated, light is converged on Polaroid point after sequentially passing through the reflection of principal reflection mirror and secondary mirror, institute
State secondary imaging system Polaroid point is imaged on focal plane, the Polaroid point is located at principal reflection mirror and secondary mirror
Between；On the light direction of propagation, the secondary imaging system by front and rear the first positive crescent lens being coaxially disposed, second just
Crescent lens, roll over/spread out hybrid lens, movable lens and negative crescent lens composition.
Preferably, the first positive crescent lens and the second positive crescent lens bend towards object space, movable lens and negative crescent moon
Shape lens bend towards image space.
Preferably, described to roll over/spread out lens body of the hybrid lens including bearing crescent, lens body bends towards object space, lens
The exit facet of body is set to aspherical superposition diffraction surfaces.
Preferably, the equation of the aspherical superposition diffraction surfaces is：
Wherein c5For curvature, r5For the radial coordinate in vertical optical axis direction, k5For conic constant, A5For the aspherical system of quadravalence
Number, B5For six rank asphericity coefficients, C5For eight rank asphericity coefficients；HOR is diffraction time, C1、C2、C3For diffraction surfaces coefficient, λ0
For designed central wavelength.
Preferably, the material of the principal reflection mirror and secondary mirror is aluminium.
Preferably, the material of the described first positive crescent lens, the second positive crescent lens and movable lens is monocrystalline germanium.
Preferably, the described material for rolling over/spreading out hybrid lens and negative crescent lens is zinc selenide.
Preferably, the movable lens are axially moveable the position for adjusting image planes.
Preferably, the focal length for taking optical system is f；The focal length f of the principal reflection mirror1Meet 0.76 ＜ f1/ f ＜ 0.78；Institute
State the focal length f of secondary mirror2Meet -4.17 ＜ f2/ f ＜ -1.87；The focal length f of the first positive crescent lens3Meet 0.13
＜ f3/ f ＜ 0.15；The focal length f of the second positive crescent lens4Meet 0.10 ＜ f4/ f ＜ 0.13；The first positive crescent
The combined focal length f of lens and the second positive crescent lens34Meet 0.08 ＜ f34/ f ＜ 0.1；It is described to roll over/spread out hybrid lens
Focal length f5Meet -0.74 ＜ f5/ f ＜ -0.46；The focal length f of the movable lens6Meet 0.09 ＜ f6/ f ＜ 0.13；It is described negative
The focal length f of crescent lens7Meet -0.65 ＜ f7/ f ＜ -0.38；It is described to roll over/spread out hybrid lens, movable lens and negative crescent
The combined focal length f of lens567Meet 0.09 ＜ f567/ f ＜ 0.12.
The beneficial effects of the invention are as follows：
1st, the present invention uses cassette system, by the cooperation of principal reflection mirror and secondary mirror, in the case where system bulk is constant
Increase light path using the multiple refraction of light, so as to increase the focal length of optical system, realize long coking；
2nd, by secondary imaging, influence of the veiling glare to system imaging effect can be suppressed, picture quality is effectively improved；
3rd, by Rational choice principal reflection mirror, the focal power of secondary mirror and interval, realize that system centre blocks≤0.3, effectively
The efficiency of light energy utilization is improved, the influence to optical system picture element due to central obscuration is reduced；
4th, by setting movable lens, it is possible to use move movable lens to finely tune the position of optical system image planes, in not jljl
Optical system image planes are adjusted to detector focal plane position away under the conditions of, so as to compensate due to the change of target being observed distance
Caused optical system defocus.It can also be combined simultaneously with optics without thermalization, the image planes movement that compensation temperature change is caused subtracts
Few pure optics reduces the complexity of camera lens without the lens numbers needed for thermalization；
5th, using PASSIVE OPTICAL without thermalization with it is mechanical be actively combined without thermalization by the way of realize system in -40 DEG C to+60 DEG C temperature
Image planes defocusing compensation in the range of degree caused by temperature change；
6th, the characteristics of having negative dispersion, negative expansion coefficient using diffraction element, passes through the reasonable of hybrid element focal power of rolling over/spread out
Distribution and matching, reduce defocusing amount of the infrared optical system caused by temperature change, reduce temperature compensation mechanism
Compensation rate, is effectively simplified optical system structure, so as to alleviate weight, reduction system volume.
Brief description of the drawings
Fig. 1 is the index path of the present invention；
Fig. 2 is transmission function figure of the present invention in the case of -40 DEG C；
Fig. 3 is transmission function figure of the present invention in the case of 20 DEG C；
Fig. 4 is transmission function figure of the present invention in the case of 60 DEG C；
Fig. 5 is the curvature of field distortion figure of the present invention；
Fig. 6 is the relation schematic diagram of diffraction element phase cycling of the present invention and radial distance.
Reference：1st, principal reflection mirror, 2, secondary mirror, the 3, first positive crescent lens, the 4, second positive crescent lens,
5th, roll over/spread out hybrid lens, 6, movable lens, 7, negative crescent lens, 8, focal plane.
Embodiment
Embodiments of the present invention are illustrated below according to accompanying drawing.
As shown in figure 1, a kind of object lens of large relative aperture long-focus uncooled ir is without thermalization optical system, in the light direction of propagation
On be arranged at the front of focal plane 8, be made up of the cassette system and secondary imaging system that are coaxially disposed, wherein cassette system is used for
Convergence compression is carried out to light, completes Polaroid, secondary imaging system is used to suppress the shadow that veiling glare is integrally imaged system
Ring, improve image quality.
Cassette system includes principal reflection mirror 1 and the secondary mirror 2 being set up in parallel, and light sequentially passes through principal reflection mirror 1 and secondary
Converged to after the reflection of speculum 2 on Polaroid face, an image position is between principal reflection mirror 1 and secondary mirror 2.
Secondary imaging system will be once as being imaged on focal plane 8, and on the light direction of propagation, secondary imaging system is by preceding
The first positive crescent lens 3 for being coaxially disposed afterwards, the second positive crescent lens 4, roll over/spread out hybrid lens 5, movable lens 6 and negative
Crescent lens 7 are constituted.
The total focal length of optical system is f, then the focal length of each lens meets following condition：
The focal length f of principal reflection mirror 11Meet 0.76 ＜ f1/ f ＜ 0.78；The focal length f of secondary mirror 22Meet -4.17 ＜ f2/ f ＜-
1.87；The focal length f of first positive crescent lens 33Meet 0.13 ＜ f3/ f ＜ 0.15；The focal length f of second positive crescent lens 44It is full
0.10 ＜ f of foot4/ f ＜ 0.13；The combined focal length f of the first positive crescent lens 4 of positive crescent lens 3 and second34Meet 0.08 ＜
f34/ f ＜ 0.1；Roll over/spread out the focal length f of hybrid lens 55Meet -0.74 ＜ f5/ f ＜ -0.46；The focal length f of movable lens 66Meet
0.09 ＜ f6/ f ＜ 0.13；The focal length f of negative crescent lens 77Meet -0.65 ＜ f7/ f ＜ -0.38；Roll over/spread out hybrid lens 5, live
The combined focal length f of dynamic lens 6 and negative crescent lens 7567Meet 0.09 ＜ f567/ f ＜ 0.12.
Preferably, the plane of incidence of the second positive crescent lens 4 is aspherical, and using Asphere faces type, its equation is：
Wherein c4For curvature, r4For the radial coordinate in vertical optical axis direction, k4For conic constant, A4For the aspherical system of quadravalence
Number, B4For six rank asphericity coefficients, C4For eight rank asphericity coefficients, D4For ten rank asphericity coefficients.
Further, parameters are as shown in table 1 in the second positive plane of incidence equation of crescent lens 4.
Table 1
Rolling over/spread out hybrid lens 5 includes the lens body of negative crescent, and lens body bends towards object space, and the exit facet of lens body is set
It is aspherical to be set to aspherical superposition diffraction surfaces, the i.e. exit facet of lens body, and diamond turning is utilized on aspheric substrate
Continuous relief structure formation diffraction surfaces are processed, its equation is：
Wherein c5For curvature, r5For the radial coordinate in vertical optical axis direction, k5For conic constant, A5For the aspherical system of quadravalence
Number, B5For six rank asphericity coefficients, C5For eight rank asphericity coefficients；HOR is diffraction time, C1、C2、C3For diffraction surfaces coefficient, l0
For designed central wavelength.Preferably, parameters are as shown in table 2.
Table 2
The coefficient of expansion of diffraction surfaces is met：
The coefficient of expansion of lens body is met：
WhereinFor the coefficient of expansion of lens material, n and n0The respectively folding of lens material and surrounding medium
Penetrate rate,For the thermal refractive index coefficient of material.
Preferably, the shape of each lens, dimensional parameters and material are as shown in table 3, table mean curvature radius, thickness and interval
Unit be mm, parabola and aspherical radius of curvature refer to the radius of curvature of apex.
Table 3
The technical indicator that the present invention is realized is as follows.
It is adapted to detector pixel dimension：17μm；
Service band：8 μm~12 μm；
F#：1；
Focal length：500mm；
Central obscuration：≤0.3；
Optics overall length and focal distance ratio：≤0.64.
By emulation experiment, as shown in Figures 2 to 4, the pixel dimension of selection is 17 μm, and pixel count is 640 × 512 non-system
When cold detector correspondence spatial frequency is 30lp/mm, transmission function of the present invention under the conditions of -40 DEG C, 20 DEG C ,+60 DEG C is minimum
For 0.5；As shown in figure 5, present invention distortion is respectively less than 1% in big small field of view.As shown in fig. 6, rolling over/spreading out the annulus of hybrid lens 5
Number is that the size between 3, edge ring band is 574 μm, can be obtained by diamond turning.
It the above is only presently preferred embodiments of the present invention and oneself, any formal limitation not made to the present invention, although this
Invention is disclosed above with preferred embodiment, but is not limited to the present invention, any those skilled in the art,
Do not depart from the range of technical solution of the present invention, when the technology contents using the disclosure above make few modifications or are modified to equivalent
The equivalent embodiment of change, as long as being that, without departing from technical solution of the present invention content, the technical spirit according to the present invention is real to more than
Any simple modification, equivalent variations and modification that example made are applied, in the range of still falling within technical solution of the present invention.
Claims (9)
1. a kind of object lens of large relative aperture long-focus uncooled ir is without thermalization optical system, it is arranged on the light direction of propagation burnt flat
Face（8）Front, be made up of the cassette system and secondary imaging system that are coaxially disposed, the cassette system includes being set up in parallel
Principal reflection mirror（1）And secondary mirror（2）, light sequentially passes through principal reflection mirror（1）And secondary mirror（2）Reflection after converge to
On Polaroid point, Polaroid point is imaged on focal plane by the secondary imaging system（8）On, it is characterised in that：Described one
Secondary imaging point is located at principal reflection mirror（1）With secondary mirror（2）Between；On the light direction of propagation, the secondary imaging system by
Front and rear the first positive crescent lens being coaxially disposed（3）, the second positive crescent lens（4）, roll over/spread out hybrid lens（5）, activity thoroughly
Mirror（6）With negative crescent lens（7）Composition.
2. a kind of object lens of large relative aperture long-focus uncooled ir as claimed in claim 1 is without thermalization optical system, its feature exists
In：First positive crescent lens（3）With the second positive crescent lens（4）Bend towards object space, movable lens（6）It is saturating with negative crescent
Mirror（7）Bend towards image space.
3. a kind of object lens of large relative aperture long-focus uncooled ir as claimed in claim 1 is without thermalization optical system, its feature exists
In：It is described to roll over/spread out hybrid lens（5）Lens body including bearing crescent, lens body bends towards object space, the outgoing of lens body
Face uses aspherical superposition diffraction surfaces.
4. a kind of object lens of large relative aperture long-focus uncooled ir as claimed in claim 3 is without thermalization optical system, its feature exists
In：It is described it is aspherical superposition diffraction surfaces equation be：
；
Whereinc 5 For curvature,r 5 For the radial coordinate in vertical optical axis direction,k 5 For conic constant,A 5 For the aspherical system of quadravalence
Number,B 5 For six rank asphericity coefficients,C 5 For eight rank asphericity coefficients；HORFor diffraction time,C 1 、C 2 、C 3For diffraction surfaces coefficient,l 0
For designed central wavelength.
5. a kind of object lens of large relative aperture long-focus uncooled ir as claimed in claim 1 is without thermalization optical system, its feature exists
In：The principal reflection mirror（1）And secondary mirror（2）Material be aluminium.
6. a kind of object lens of large relative aperture long-focus uncooled ir as claimed in claim 1 is without thermalization optical system, its feature exists
In：The first positive crescent lens（3）, the second positive crescent lens（4）And movable lens（6）Material be monocrystalline germanium.
7. a kind of object lens of large relative aperture long-focus uncooled ir as claimed in claim 1 is without thermalization optical system, its feature exists
In：It is described to roll over/spread out hybrid lens（5）With negative crescent lens（7）Material be zinc selenide.
8. a kind of object lens of large relative aperture long-focus uncooled ir as claimed in claim 1 is without thermalization optical system, its feature exists
In：The movable lens（6）It is axially moveable the position for adjusting image planes.
9. a kind of object lens of large relative aperture long-focus uncooled ir as claimed in claim 1 is without thermalization optical system, its feature exists
In：The focal length for taking optical system isf；
The principal reflection mirror（1）Focal lengthf 1Meet 0.76 ＜f 1/ f＜ 0.78；
The secondary mirror（2）Focal lengthf 2Meet -4.17 ＜f 2/ f＜ -1.87；
The first positive crescent lens（3）Focal lengthf 3Meet 0.13 ＜f 3/ f＜ 0.15；
The second positive crescent lens（4）Focal lengthf 4Meet 0.10 ＜f 4/ f＜ 0.13；
The first positive crescent lens（3）With the described second positive crescent lens（4）Combined focal lengthf 34Meet 0.08 ＜f 34/f＜ 0.1；
It is described to roll over/spread out hybrid lens（5）Focal lengthf 5Meet -0.74 ＜f 5/ f＜ -0.46；
The movable lens（6）Focal lengthf 6Meet 0.09 ＜f 6/ f＜ 0.13；
The negative crescent lens（7）Focal lengthf 7Meet -0.65 ＜f 7/ f＜ -0.38；
It is described to roll over/spread out hybrid lens（5）, movable lens（6）With negative crescent lens（7）Combined focal lengthf 567Meet 0.09 ＜f 567/ f＜ 0.12.
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| CN201710361195.6A CN106990517B (en) | 2017-05-22 | 2017-05-22 | Large-relative-aperture long-focus uncooled infrared athermalized optical system |
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| CN201710361195.6A CN106990517B (en) | 2017-05-22 | 2017-05-22 | Large-relative-aperture long-focus uncooled infrared athermalized optical system |
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| CN106990517B CN106990517B (en) | 2022-12-02 |
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