CN115685507A - Transmission-type dual-waveband infrared lens - Google Patents
Transmission-type dual-waveband infrared lens Download PDFInfo
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- CN115685507A CN115685507A CN202211470466.9A CN202211470466A CN115685507A CN 115685507 A CN115685507 A CN 115685507A CN 202211470466 A CN202211470466 A CN 202211470466A CN 115685507 A CN115685507 A CN 115685507A
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- 230000005499 meniscus Effects 0.000 claims abstract description 116
- 230000003287 optical effect Effects 0.000 claims abstract description 43
- 239000013078 crystal Substances 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 19
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052732 germanium Inorganic materials 0.000 claims abstract description 12
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical group [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 12
- 239000010703 silicon Substances 0.000 claims abstract description 12
- 230000005540 biological transmission Effects 0.000 claims abstract description 6
- 238000005057 refrigeration Methods 0.000 claims abstract description 6
- OYLGJCQECKOTOL-UHFFFAOYSA-L barium fluoride Chemical compound [F-].[F-].[Ba+2] OYLGJCQECKOTOL-UHFFFAOYSA-L 0.000 claims abstract description 4
- 229910001632 barium fluoride Inorganic materials 0.000 claims abstract description 4
- 230000009977 dual effect Effects 0.000 claims description 7
- 239000002759 woven fabric Substances 0.000 claims description 3
- 230000005855 radiation Effects 0.000 abstract description 8
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 2
- 230000004075 alteration Effects 0.000 description 7
- 238000003331 infrared imaging Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000003384 imaging method Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 210000003128 head Anatomy 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000001747 pupil Anatomy 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention relates to a transmission type dual-waveband infrared lens, an optical system is matched with a refrigeration type medium wave/long wave double-color infrared detector, and the optical system comprises the following components which are arranged from an object side to an image side in sequence: the lens comprises a positive meniscus lens A, a negative meniscus lens B, a negative meniscus lens C, a positive meniscus lens D, a negative meniscus lens E, a negative meniscus lens F and a double convex positive lens G, wherein the positive meniscus lens A is made of a silicon single crystal; the material of the meniscus negative lens B is germanium single crystal; the material of the meniscus negative lens C is germanium single crystal; the meniscus positive lens D is made of silicon single crystal; the material of the meniscus negative lens E is germanium single crystal; the material of the meniscus negative lens F is barium fluoride; the material of the biconvex positive lens G is a silicon single crystal. The invention can image the medium wave/long wave infrared radiation at the same time, capture the target information of two wave bands at the same time, improve the detection and identification performance of the target under the complex background environment, obtain more comprehensive and accurate target information and reduce the false alarm rate; the optical system has simple structure, good manufacturability and easy processing and adjustment.
Description
The technical field is as follows:
the invention relates to a transmission type dual-waveband infrared lens.
Background art:
at present, most of military thermal imager systems mainly use single wavelength working as main working, and long wave or medium wave. Due to the influence of the radiation characteristic of the scenery and atmospheric transmission, the infrared imaging systems with different wave bands have different detection and identification capabilities in different environments, for example, under the condition of stronger heat source radiation or background stray radiation, long waves have stronger reconnaissance capability, and medium waves have more obvious advantages in the humid and low-heat environment. Therefore, in a complex environmental climate, information acquisition of an infrared system with a single wave band is weakened.
The traditional dual-band infrared imaging system mainly comprises the following forms: the infrared imaging system is formed by combining two or more infrared imaging systems with different single wave bands; and the other is that two detectors respectively responding to different wave bands share a part of or an integral optical system. The above two dual optical systems have large volume, high cost, high installation and adjustment difficulty and limited application range.
With the development of the infrared detector technology, the detector can simultaneously respond to infrared radiation of a plurality of wave bands and output images of corresponding wave bands. The infrared detector that adopts two wave bands of ability simultaneous response medium wave/long wave shares an optical system, and this kind of system compact structure, small in size is convenient for install and debug, and application scope is wider, and the present case is from this and comes.
The invention content is as follows:
the invention aims at solving the problems in the prior art, namely, the invention aims to provide a transmission type dual-waveband infrared lens which is reasonable in design and can simultaneously image medium-wave and long-wave infrared radiation.
In order to achieve the purpose, the invention adopts the technical scheme that: a transmission type dual-waveband infrared lens comprises an optical system, an optical lens and a lens cover, wherein the optical system comprises the following components in sequence from an object side to an image side along an optical axis direction: the lens comprises a positive meniscus lens A with a convex surface facing an object plane, a negative meniscus lens B with a convex surface facing the object plane, a negative meniscus lens C with a convex surface facing the object plane, a positive meniscus lens D with a convex surface facing the object plane, a negative meniscus lens E with a concave surface facing the object plane, a negative meniscus lens F with a concave surface facing the object plane and a double-convex positive lens G, wherein the positive meniscus lens A is made of a silicon single crystal; the material of the meniscus negative lens B is germanium single crystal; the material of the meniscus negative lens C is germanium single crystal; the meniscus positive lens D is made of silicon single crystal; the material of the meniscus negative lens E is germanium single crystal; the material of the meniscus negative lens F is barium fluoride; the biconvex positive lens G is made of silicon single crystal.
Further, the optical system is matched with a refrigeration type medium wave/long wave double-color infrared detector.
Further, the air interval between the positive meniscus lens a and the negative meniscus lens B is 5.0mm, the air interval between the negative meniscus lens B and the negative meniscus lens C is 41.55mm, the air interval between the negative meniscus lens C and the positive meniscus lens D is 23.09mm, the air interval between the positive meniscus lens D and the negative meniscus lens E is 37.09mm, the air interval between the negative meniscus lens E and the negative meniscus lens F is 1.51mm, and the air interval between the negative meniscus lens F and the double convex positive lens G is 0.6mm.
Further, the optical system satisfies: -1< -f 1/f <2; -1< -f2/f <2; -1< -f3/f <2; -1< -f4/f <2; -1< -f5/f <2; 2-woven fabric f6/f <5; -1< -f7/f <2; wherein F is the focal length of the optical system, and F1, F2, F3, F4, F5, F6 and F7 are the focal lengths of the meniscus positive lens A, the meniscus negative lens B, the meniscus negative lens C, the meniscus positive lens D, the meniscus negative lens E, the meniscus negative lens F and the biconvex positive lens G respectively.
Further, the image side surface of the negative meniscus lens B, the image side surface of the negative meniscus lens C, the object side surface of the positive meniscus lens D, the image side surface of the negative meniscus lens E, the image side surface of the negative meniscus lens F, and the object side surface of the double convex positive lens G are even aspheric surfaces.
Further, a parallel flat plate is included, which is located between the biconvex positive lens G and the IMA.
Furthermore, the working wave band of the optical system is 3.7 um-4.8 um and 7.5 um-9.5 um.
Compared with the prior art, the invention has the following effects: the invention has reasonable design, can image the medium wave/long wave infrared radiation simultaneously, capture the target information of two wave bands simultaneously, improve the detection and identification performance of the target under the complex background environment, obtain more comprehensive and accurate target information and reduce the false alarm rate; meanwhile, the optical system has simple structure, good manufacturability and easy processing and adjustment.
Description of the drawings:
FIG. 1 is a schematic diagram of an optical configuration of an embodiment of the present invention;
FIG. 2 is a functional value of the MTF of the medium wave in the normal temperature environment in the embodiment of the present invention
FIG. 3 is a functional value of a long wave MTF in a normal temperature environment according to an embodiment of the present invention;
FIG. 4 is a spherical aberration plot for an embodiment of the present invention.
The specific implementation mode is as follows:
the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
As shown in fig. 1, an optical system of the transmissive dual-band infrared lens of the present invention matches with a refrigeration type medium wave/long wave dual-color infrared detector, and the optical system of the lens includes, sequentially arranged along an optical axis direction from an object side to an image side: the lens comprises a positive meniscus lens A with a convex surface facing an object plane, a negative meniscus lens B with a convex surface facing the object plane, a negative meniscus lens C with a convex surface facing the object plane, a positive meniscus lens D with a convex surface facing the object plane, a negative meniscus lens E with a concave surface facing the object plane, a negative meniscus lens F with a concave surface facing the object plane and a double-convex positive lens G, wherein the positive meniscus lens A is made of a silicon single crystal; the material of the meniscus negative lens B is germanium single crystal; the material of the meniscus negative lens C is germanium single crystal; the meniscus positive lens D is made of silicon single crystal; the material of the meniscus negative lens E is germanium single crystal; the material of the meniscus negative lens F is barium fluoride; the biconvex positive lens G is made of silicon single crystal.
In this embodiment, the air interval between the positive meniscus lens a and the negative meniscus lens B is 5.0mm, the air interval between the negative meniscus lens B and the negative meniscus lens C is 41.55mm, the air interval between the negative meniscus lens C and the positive meniscus lens D is 23.09mm, the air interval between the positive meniscus lens D and the negative meniscus lens E is 37.09mm, the air interval between the negative meniscus lens E and the negative meniscus lens F is 1.51mm, and the air interval between the negative meniscus lens F and the double convex positive meniscus lens G is 0.6mm.
In this embodiment, the optical system satisfies: -1< -f 1/f <2; -1< -f2/f <2; -1< -f3/f <2; -1< -f4/f <2; -1< -f5/f <2; 2-woven fabric f6/f <5; -1< -f7/f <2; wherein F is the focal length of the optical system, and F1, F2, F3, F4, F5, F6 and F7 are the focal lengths of the meniscus positive lens A, the meniscus negative lens B, the meniscus negative lens C, the meniscus positive lens D, the meniscus negative lens E, the meniscus negative lens F and the biconvex positive lens G respectively.
In this embodiment, the image side surface of the negative meniscus lens B, the image side surface of the negative meniscus lens C, the object side surface of the positive meniscus lens D, the image side surface of the negative meniscus lens E, the image side surface of the negative meniscus lens F, and the object side surface of the double convex positive lens G are even aspheric surfaces, and the aspheric expression is as follows:
wherein Z represents a position in the optical axis direction, r represents a height in the vertical direction with respect to the optical axis, c represents a radius of curvature, k represents a conic coefficient,
represents an aspheric coefficient. In aspherical data, E-n represents "
", e.g., 9.1996E-005 represents
。
In this embodiment, the image display device further includes a parallel flat plate located between the biconvex positive lens G and the IMA.
In this embodiment, the specific performance parameters of the optical system are as follows:
(1) Working spectral range: medium wave 3.7-4.8 um, long wave 7.5-9.5 um;
(2) F number: 3.0;
(3) Adapting the detector: 320 × 256@30um, 640 × 512@15um;
(4) The field angle: not less than 3.6 degrees.
For a refrigeration type infrared system, in order to meet the cold stop efficiency of 100%, the matching of the exit pupil of the optical system and the cold stop of the detector needs to be ensured. In order to realize the cold diaphragm efficiency of 100%, the primary imaging system causes the radial aperture of a lens at the front end of the system to be larger, and the miniaturization of the system cannot be realized. The embodiment adopts a secondary imaging structure, so that the radial aperture of each lens of the system can be reduced, the weight of the lens is lightened, and the volume of the lens is reduced. As the working wave bands of the system are between 3.7um and 4.8um and between 7.5um and 9.5um, the coverage range of the wave bands is large, and the system has large chromatic aberration. The structure form of the optical system consists of seven lenses, the chromatic aberration correction is carried out by adopting the combination of three materials, and the aberration of the even-order aspheric surface balance system is used, so that the whole volume of the optical system is small enough. The sensitivity of each optical element is reduced through the adjustment of the curvature and the thickness, so that the lens is easier to process and adjust.
In the embodiment, the dual-waveband infrared system obviously improves the performance of the system and the universality of the use environment, and can be widely applied to the fields of airborne forward-looking infrared and reconnaissance systems, early warning systems of water-surface ships, infrared imaging guide heads of precise guided weapons and the like.
The data in the following table illustrate the optical parameters of an embodiment of the invention:
table one: optical element parameter table
Table two: data relating to aspherical surface
The invention has the advantages that:
a) The optical system is matched with the refrigeration type medium wave/long wave double-color infrared detector, so that medium wave/long wave infrared radiation can be imaged simultaneously, target information of two wave bands can be captured simultaneously, the detection and identification performance of a target can be improved under a complex background environment, more comprehensive and accurate target information can be obtained, and the false alarm rate can be reduced;
b) The infrared detectors capable of simultaneously responding to the medium wave/long wave two wave bands share one optical system, and the optical system has the advantages of compact structure, small volume, convenience in installation and debugging and wider application range;
c) The optical system adopts a secondary imaging structural form, realizes 100% of cold diaphragm efficiency, effectively compresses the overall radial size of the optical system and realizes miniaturization of the optical system;
d) The working wave bands of the optical system are 3.7 um-4.8 um and 7.5 um-9.5 um, the coverage wave band range is large, and the system has larger chromatic aberration. The system adopts the combination of three materials to correct chromatic aberration, uses an even-order aspheric surface to balance the system aberration, has simple structure and good manufacturability, and is convenient to process, install and adjust.
If the invention discloses or relates to parts or structures which are fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes unless otherwise stated.
Any part provided by the invention can be assembled by a plurality of independent components or can be manufactured by an integral forming process.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (7)
1. A transmission type dual-waveband infrared lens is characterized in that: the optical system of the lens comprises the following components which are arranged in sequence from an object side to an image side along the direction of an optical axis: the lens comprises a positive meniscus lens A with a convex surface facing an object plane, a negative meniscus lens B with a convex surface facing the object plane, a negative meniscus lens C with a convex surface facing the object plane, a positive meniscus lens D with a convex surface facing the object plane, a negative meniscus lens E with a concave surface facing the object plane, a negative meniscus lens F with a concave surface facing the object plane and a double-convex positive lens G, wherein the positive meniscus lens A is made of a silicon single crystal; the material of the meniscus negative lens B is germanium single crystal; the material of the meniscus negative lens C is germanium single crystal; the meniscus positive lens D is made of silicon single crystal; the material of the meniscus negative lens E is germanium single crystal; the material of the meniscus negative lens F is barium fluoride; the biconvex positive lens G is made of silicon single crystal.
2. A transmissive dual band infrared lens as set forth in claim 1, wherein: the optical system is matched with a refrigeration type medium wave/long wave double-color infrared detector.
3. A transmissive dual band infrared lens as set forth in claim 1, wherein: the air interval of the positive meniscus lens A and the negative meniscus lens B is 5.0mm, the air interval of the negative meniscus lens B and the negative meniscus lens C is 41.55mm, the air interval of the negative meniscus lens C and the positive meniscus lens D is 23.09mm, the air interval of the positive meniscus lens D and the negative meniscus lens E is 37.09mm, the air interval of the negative meniscus lens E and the negative meniscus lens F is 1.51mm, and the air interval of the negative meniscus lens F and the double convex positive meniscus lens G is 0.6mm.
4. A transmissive dual band infrared lens as set forth in claim 1, wherein: the optical system satisfies: -1< -f 1/f <2; -1< -f2/f <2; -1< -f3/f <2; -1< -f4/f <2; -1< -f5/f <2; 2-woven fabric f6/f <5; -1< -f7/f <2; wherein F is the focal length of the optical system, and F1, F2, F3, F4, F5, F6 and F7 are the focal lengths of the meniscus positive lens A, the meniscus negative lens B, the meniscus negative lens C, the meniscus positive lens D, the meniscus negative lens E, the meniscus negative lens F and the biconvex positive lens G respectively.
5. A transmissive dual band infrared lens as set forth in claim 1, wherein: and the image side surface of the negative meniscus lens B, the image side surface of the negative meniscus lens C, the object side surface of the positive meniscus lens D, the image side surface of the negative meniscus lens E, the image side surface of the negative meniscus lens F and the object side surface of the double-convex positive lens G are even aspheric surfaces.
6. A transmissive dual band infrared lens as set forth in claim 1, wherein: and a parallel flat plate positioned between the biconvex positive lens G and the IMA.
7. A transmissive dual band infrared lens as set forth in claim 1, wherein: the working wave bands of the optical system are 3.7 um-4.8 um and 7.5 um-9.5 um.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202211470466.9A CN115685507B (en) | 2022-11-23 | 2022-11-23 | Transmission type dual-band infrared lens |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211470466.9A CN115685507B (en) | 2022-11-23 | 2022-11-23 | Transmission type dual-band infrared lens |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5022724A (en) * | 1989-02-15 | 1991-06-11 | El-Op Electro-Optics Industries | Zoom system |
| JPH11287951A (en) * | 1998-03-16 | 1999-10-19 | Nikon Corp | Infrared camera lens system |
| RU2007135969A (en) * | 2007-09-27 | 2009-04-10 | Федеральное государственное унитарное предприятие "Научно-производственное объединение "Государственный институт прикладной оптики" | INFRARED LENS WITH FULLY VARIABLE FOCUS DISTANCE |
| CN106342261B (en) * | 2010-09-03 | 2014-02-05 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of infrared variable focal length optical system |
| CN111123486A (en) * | 2019-11-26 | 2020-05-08 | 天津津航技术物理研究所 | Medium wave infrared athermal optical lens suitable for wide temperature range |
| CN111458843A (en) * | 2020-05-28 | 2020-07-28 | 苏州东方克洛托光电技术有限公司 | Medium wave infrared microscope lens |
-
2022
- 2022-11-23 CN CN202211470466.9A patent/CN115685507B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5022724A (en) * | 1989-02-15 | 1991-06-11 | El-Op Electro-Optics Industries | Zoom system |
| JPH11287951A (en) * | 1998-03-16 | 1999-10-19 | Nikon Corp | Infrared camera lens system |
| RU2007135969A (en) * | 2007-09-27 | 2009-04-10 | Федеральное государственное унитарное предприятие "Научно-производственное объединение "Государственный институт прикладной оптики" | INFRARED LENS WITH FULLY VARIABLE FOCUS DISTANCE |
| CN106342261B (en) * | 2010-09-03 | 2014-02-05 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of infrared variable focal length optical system |
| CN111123486A (en) * | 2019-11-26 | 2020-05-08 | 天津津航技术物理研究所 | Medium wave infrared athermal optical lens suitable for wide temperature range |
| CN111458843A (en) * | 2020-05-28 | 2020-07-28 | 苏州东方克洛托光电技术有限公司 | Medium wave infrared microscope lens |
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