CN203224663U - Non-focusing athermalization infrared optical system - Google Patents
Non-focusing athermalization infrared optical system Download PDFInfo
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- CN203224663U CN203224663U CN201220469744.4U CN201220469744U CN203224663U CN 203224663 U CN203224663 U CN 203224663U CN 201220469744 U CN201220469744 U CN 201220469744U CN 203224663 U CN203224663 U CN 203224663U
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- aspheric surface
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Abstract
The utility model discloses a non-focusing athermalization infrared optical system. The structure adopts a three-piece separate-type structure. A first piece adopts a positive meniscus lens provided with a convex surface facing frontwards, which can be used for focusing of the light. A second piece adopts a negative meniscus lens provided with a convex surface facing frontwards, and a third piece adopts a biconvex positive lens. The combination of the three pieces can be used to eliminate the aberrations such as spherical aberration, chromatic aberration, field curvature, and distortion, and therefore the aberrations balance of the system can be achieved, and the imaging on the infrared focal plane detector can be realized. The non-focusing athermalization infrared optical system is advantageous in that no motion elements are required, the structure is simple, the design is reasonable, the whole group does not require the focusing, and the requirement of the system of clear imaging of an object in a range from 10 m to infinite under a temperature condition in a range from minus 40 DEG C to 50 DEG C can be satisfied.
Description
Technical field
The utility model belongs to the optical design technical field, and being specifically related to a kind of non-focusing does not have the thermalization infrared optical system, need not focus and can satisfy the high-resolution picture element requirement in 10m～∞ scope under-40 ℃～+ 50 ℃ environmental baselines.
Background technology
Fast development along with the infrared night vision technology, the uncooled ir optical system is widely used in civil engineering, but the thermal refractive index coefficient dn/dT of infrared lens material therefor is bigger, variation along with environment temperature, the curvature of refractive index, optical element and thickness, part interval etc. all can change, make infrared optical system produce hot out of focus, cause the system imaging degradation.Therefore there is not the mainstream development direction that the thermalization infrared optical system becomes the high precision infrared optical system.Infrared system does not have the thermalization method for designing and mainly contains three kinds: first kind is mechanical passive compensation method, adopts the complementation of structural member materials hot deformation and infra-red material thermal expansion to carry out temperature compensation; Second kind is machinery (electronics) Active Compensation method, adopts traditional electronic focusing to carry out temperature compensation; The passive compensation of machinery and machinery (electronics) Active Compensation method all cause the system authority complexity, and reliability is low, operation inconvenience; The third is the PASSIVE OPTICAL penalty method, and method commonly used is to add diffraction optical element in system, but diffraction optical element processing and assembly technology complexity, the production cost height.
The utility model content
For solving the above-mentioned defective that prior art exists, the purpose of this utility model provides a kind of non-focusing does not have the thermalization infrared optical system.Have simple in structure, optical axis stable, the system reliability height makes whole infrared system not produce out of focus, guarantee optical system under different ambient temperature conditions, need not focus still can keep far away, the imaging of close shot thing is clear.
For achieving the above object, the technical scheme that the utility model is taked: this non-focusing does not have the thermalization infrared optical system and is made of three lens, wherein: it is the lens that infra-red material constitutes that described three lens adopt sulphur, its version adopts three separate type, first is adopted convex surface positive meniscus lens forward that light is focused on, second is convex surface diverging meniscus lens forward, and the 3rd is the biconvex positive lens, is imaged on the infrared focal plane detector at last; The concave surface of wherein said positive meniscus lens is aspheric surface, and its high order aspheric surface equation is:
The concave surface of described diverging meniscus lens is aspheric surface, and the secondary aspherical equation is:
Wherein: Z is the corresponding vertical range of aspheric surface axle; C is vertex curvature; R is the radial distance from the aspheric surface axle.
It is as follows that the non-focusing of f '=25mm/F1.0 does not have thermalization infrared optical system parameter:
| Sequence number | Radius | Thickness (at interval) | | Material | Remarks | |
| 1 | 20.85 | 4.8 | | ZnSe | ||
| 2 | 59.7 | 6.3 | φ23.4 | | ||
| 3 | 34.9 | 1.5 | φ17.2 | ZnS | ||
| 4 | 11 | 6.5 | φ14.8 | Aspheric surface | ||
| 5 | 22.809 | 4 | φ18.4 | ZnSe | ||
| 6 | -324.14 | 10.36(operating distance) | φ18.1 | |||
| 7 | Image planes | φ12 | The infrared eye target surface |
Adopt the beneficial effect of technique scheme: it is three three separate type that this non-focusing does not have the thermalization infrared optical system, first is adopted convex surface positive meniscus lens forward that light is focused on, second is convex surface diverging meniscus lens forward, and the 3rd is the biconvex positive lens.Aberrations such as spherical aberration, aberration, the curvature of field, distortion are eliminated in three combinations, make system reach aberration balancing, are imaged on the infrared focal plane detector at last.Wherein the concave surface of the concave surface of positive meniscus lens and diverging meniscus lens all adopts aspheric surface, can further improve thermal characteristics and dispersion characteristics.It is infra-red material that material therefor all adopts sulphur, this system utilizes the PASSIVE OPTICAL compensation method, do not use diffraction optical element to carry out temperature compensation, utilize the difference between the infra-red material thermal characteristics, by choose reasonable infrared lens material commonly used and distribution focal power, the assurance optical system need not focused under different ambient temperature conditions still can keep far away, the imaging of close shot thing is clear.Fig. 2 to Fig. 7 be 25 millimeters no thermalization infrared lens respectively in environment temperature under-40 ℃, 20 ℃ and the 50 ℃ of situations, transport function and point range figure when 10m and infinite distance distance are satisfied Nyquist frequency 20lp/mm.This system architecture is simple, optical axis stable, and the system reliability height need not focused and can be satisfied the high-resolution picture element requirement in 10m～∞ scope under-40 ℃～+ 50 ℃ environmental baselines.
Description of drawings
Below in conjunction with accompanying drawing specific embodiments of the invention are described in further detail.
Fig. 1 is structural representation of the present invention.
Fig. 2 is-40 ℃ of infinite distance distances MTF figure down.
Fig. 3 is-40 ℃ of infinite distance distances point range figures down.
Fig. 4 schemes apart from MTF for-40 ℃ of following 10m.
Fig. 5 is that-40 ℃ of following 10m are apart from point range figure.
Fig. 6 is 20 ℃ of infinite distance distances MTF figure down.
Fig. 7 is 20 ℃ of infinite distance distances point range figures down.
MTF figure under 10m distance when Fig. 8 is 20 ℃.
Point range figure under 10m distance when Fig. 9 is 20 ℃.
Figure 10 is 50 ℃ of infinite distance distances MTF figure down.
Figure 11 is 50 ℃ of infinite distance distances point range figures down.
MTF figure under 10m distance when Figure 12 is 50 ℃.
Point range figure under 10m distance when Figure 13 is 50 ℃.
Embodiment
Focal distance f '=25 millimeter as shown in Figure 1, the F number is that 1 non-focusing does not have the thermalization infrared optical system, and version adopts three separate type, and first is adopted 1 pair of light of convex surface positive meniscus lens forward to focus on, second is that 2, the three of convex surface diverging meniscus lenses forward are biconvex positive lens 3.Aberrations such as spherical aberration, aberration, the curvature of field, distortion are eliminated in three combinations, make system reach aberration balancing, are imaged at last on the infrared focal plane detector 4.Described positive meniscus lens 1 and biconvex positive lens 3 adopt zinc selenide crystal, and wherein the concave surface of positive meniscus lens 1 adopts aspheric surface, and the high order aspheric surface equation is:
Described diverging meniscus lens 2 adopts zinc sulfide crystal, and its concave surface is aspheric surface, and the secondary aspherical equation is:
Wherein: Z is the corresponding vertical range of aspheric surface axle; C is vertex curvature; R is the radial distance from the aspheric surface axle.
Fig. 2,3,4,5,6,7,8,9,10,11,12,13 be 25 millimeters no thermalization infrared lens respectively in environment temperature under-40 ℃, 20 ℃ and the 50 ℃ of situations, transport function and point range figure when 10m and infinite distance distance are satisfied Nyquist frequency 20lp/mm.This system optical axis is stable as can be seen, and the system reliability height need not focused and can be satisfied the high-resolution picture element requirement in 10m～∞ scope under-40 ℃～+ 50 ℃ environmental baselines.
Claims (1)
1. a non-focusing does not have the thermalization infrared optical system, constituted by three lens, it is characterized in that: it is the lens that infra-red material constitutes that described three lens adopt sulphur, its version adopts three separate type, first is adopted convex surface positive meniscus lens forward that light is focused on, second is convex surface diverging meniscus lens forward, and the 3rd is the biconvex positive lens, is imaged on the infrared focal plane detector at last; The concave surface of wherein said positive meniscus lens is aspheric surface, and its high order aspheric surface equation is:
The concave surface of described diverging meniscus lens is aspheric surface, and the secondary aspherical equation is:
Wherein: Z is the corresponding vertical range of aspheric surface axle; C is vertex curvature; R is the radial distance from the aspheric surface axle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220469744.4U CN203224663U (en) | 2012-09-17 | 2012-09-17 | Non-focusing athermalization infrared optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220469744.4U CN203224663U (en) | 2012-09-17 | 2012-09-17 | Non-focusing athermalization infrared optical system |
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| Publication Number | Publication Date |
|---|---|
| CN203224663U true CN203224663U (en) | 2013-10-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201220469744.4U Expired - Lifetime CN203224663U (en) | 2012-09-17 | 2012-09-17 | Non-focusing athermalization infrared optical system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103837963A (en) * | 2014-01-24 | 2014-06-04 | 宁波舜宇红外技术有限公司 | Novel long-wave infrared athermalization camera lens with high light flux |
| CN106199919A (en) * | 2016-09-23 | 2016-12-07 | 中山联合光电科技股份有限公司 | A kind of optics athermal, high pixel, high illumination, the infra-red thermal imaging system of low cost |
| CN106444050A (en) * | 2016-11-02 | 2017-02-22 | 安图实验仪器(郑州)有限公司 | Laser-desorption ion source laser path |
| CN106526806A (en) * | 2016-12-16 | 2017-03-22 | 福建福光天瞳光学有限公司 | Large depth-of-field long wave infrared wide-angle temperature measuring lens and working method thereof |
| CN113589475A (en) * | 2021-07-02 | 2021-11-02 | 支付宝(杭州)信息技术有限公司 | Projection lens suitable for 3D face recognition |
-
2012
- 2012-09-17 CN CN201220469744.4U patent/CN203224663U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103837963A (en) * | 2014-01-24 | 2014-06-04 | 宁波舜宇红外技术有限公司 | Novel long-wave infrared athermalization camera lens with high light flux |
| CN106199919A (en) * | 2016-09-23 | 2016-12-07 | 中山联合光电科技股份有限公司 | A kind of optics athermal, high pixel, high illumination, the infra-red thermal imaging system of low cost |
| CN106199919B (en) * | 2016-09-23 | 2018-10-09 | 中山联合光电科技股份有限公司 | A kind of infra-red thermal imaging system of optics athermal, high pixel, high illumination, low cost |
| CN106444050A (en) * | 2016-11-02 | 2017-02-22 | 安图实验仪器(郑州)有限公司 | Laser-desorption ion source laser path |
| CN106444050B (en) * | 2016-11-02 | 2019-04-19 | 安图实验仪器(郑州)有限公司 | Laser desorption ion source laser optical path |
| CN106526806A (en) * | 2016-12-16 | 2017-03-22 | 福建福光天瞳光学有限公司 | Large depth-of-field long wave infrared wide-angle temperature measuring lens and working method thereof |
| CN113589475A (en) * | 2021-07-02 | 2021-11-02 | 支付宝(杭州)信息技术有限公司 | Projection lens suitable for 3D face recognition |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131002 |