CN115685507B - Transmission type dual-band infrared lens - Google Patents
Transmission type dual-band infrared lens Download PDFInfo
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- CN115685507B CN115685507B CN202211470466.9A CN202211470466A CN115685507B CN 115685507 B CN115685507 B CN 115685507B CN 202211470466 A CN202211470466 A CN 202211470466A CN 115685507 B CN115685507 B CN 115685507B
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Abstract
The invention relates to a transmission type dual-band infrared lens, which is matched with a cold type medium wave/long wave bicolor infrared detector by an optical system, wherein the optical system comprises the following components in sequence from an object side to an image side: a meniscus positive lens A, a meniscus negative lens B, a meniscus negative lens C, a meniscus positive lens D, a meniscus negative lens E, a meniscus negative lens F and a biconvex positive lens G, wherein the material of the meniscus positive lens A is silicon single crystal; the material of the meniscus negative lens B is germanium monocrystal; the material of the meniscus negative lens C is germanium monocrystal; the material of the meniscus positive lens D is silicon single crystal; the material of the meniscus negative lens E is germanium monocrystal; the material of the meniscus negative lens F is barium fluoride; the material of the biconvex positive lens G is silicon single crystal. The invention can simultaneously image the medium wave/long wave infrared radiation, simultaneously capture the target information of two wave bands, 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, easy processing and adjustment.
Description
Technical field:
the invention relates to a transmission type dual-band infrared lens.
The background technology is as follows:
most of the current military thermal imager systems still use single wavelength as the main, long or medium wave. Due to the influence of the self radiation characteristic of a scene and atmospheric transmission, the infrared imaging systems with different wave bands have different detection and identification capacities in different environments, such as strong detection capacity of long waves under the condition of strong heat source radiation or background stray radiation, and have more obvious advantages in the humid and low-heat environments. Therefore, in a complex environmental climate, information acquired by an infrared system with a single wave band is weakened.
The traditional dual-band infrared imaging system mainly consists of the following forms: first, two or more infrared imaging systems with different single wave bands are combined; and secondly, the two detectors respectively responding to different wave bands share a part or an integral optical system. The two double-light system composition modes cause the whole system to have large volume, high cost, large adjustment difficulty and certain limitation on the application range.
With the development of infrared detector technology, the detector can respond to infrared radiation of a plurality of wave bands at the same time and output images of corresponding wave bands. The infrared detectors capable of simultaneously responding to the middle wave/long wave bands share the same optical system, and the infrared detector has the advantages of compact structure, small volume, convenience in installation and debugging and wider application range.
The invention comprises the following steps:
the invention aims at improving the problems existing in the prior art, namely the technical problem to be solved by the invention is to provide the transmission type double-band infrared lens which is reasonable in design and can simultaneously image the middle-wave and long-wave infrared radiation.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a transmissive dual-band infrared lens, an optical system of the lens comprising, in order from an object side to an image side,: a positive meniscus lens A with a convex surface facing the 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 silicon single crystal; the material of the meniscus negative lens B is germanium monocrystal; the material of the meniscus negative lens C is germanium monocrystal; the material of the meniscus positive lens D is silicon single crystal; the material of the meniscus negative lens E is germanium monocrystal; the material of the meniscus negative lens F is barium fluoride; the biconvex positive lens G is made of silicon single crystal.
Furthermore, the optical system is matched with a cold medium wave/long wave bicolor infrared detector.
Further, the air space between the positive meniscus lens A and the negative meniscus lens B is 5.0mm, the air space between the negative meniscus lens B and the negative meniscus lens C is 41.55mm, the air space between the negative meniscus lens C and the positive meniscus lens D is 23.09mm, the air space between the positive meniscus lens D and the negative meniscus lens E is 37.09mm, the air space between the negative meniscus lens E and the negative meniscus lens F is 1.51mm, and the air space between the negative meniscus lens F and the biconvex positive lens G is 0.6mm.
Further, the optical system satisfies: -1< f1/f <2; -1< f2/f <2; -1< f3/f <2; -1< f4/f <2; -1< f5/f <2;2< 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 positive meniscus lens A, the negative meniscus lens B, the negative meniscus lens C, the positive meniscus lens D, the negative meniscus lens E, the negative meniscus lens F, and the biconvex positive lens G, respectively.
Further, the image side of the meniscus negative lens B, the image side of the meniscus negative lens C, the object side of the meniscus positive lens D, the image side of the meniscus negative lens E, the image side of the meniscus negative lens F, and the object side of the biconvex positive lens G are even aspheric surfaces.
Further, a parallel plate is included, which is located between the biconvex positive lens G and the IMA.
Further, the working wave bands of the optical system are 3.7um to 4.8um and 7.5um to 9.5um.
Compared with the prior art, the invention has the following effects: the invention has reasonable design, can simultaneously image the middle wave/long wave infrared radiation, simultaneously capture the target information of two wave bands, 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 view of an optical structure of an embodiment of the present invention;
FIG. 2 is a graph showing the value of the medium wave MTF function in a normal temperature environment according to an embodiment of the present invention
FIG. 3 is a graph showing the MTF function values of a long wave under a normal temperature environment according to an embodiment of the present invention;
fig. 4 is a graph of spherical aberration for an embodiment of the present invention.
The specific embodiment is as follows:
the invention will be described in further detail with reference to the drawings and the detailed description.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
As shown in fig. 1, the optical system of the transmission type dual-band infrared lens disclosed by the invention is matched with a cold type medium-wave/long-wave dual-color infrared detector, and the optical system of the lens comprises the following components in sequence from an object side to an image side along the optical axis direction: a positive meniscus lens A with a convex surface facing the 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 silicon single crystal; the material of the meniscus negative lens B is germanium monocrystal; the material of the meniscus negative lens C is germanium monocrystal; the material of the meniscus positive lens D is silicon single crystal; the material of the meniscus negative lens E is germanium monocrystal; 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 space between the positive meniscus lens a and the negative meniscus lens B is 5.0mm, the air space between the negative meniscus lens B and the negative meniscus lens C is 41.55mm, the air space between the negative meniscus lens C and the positive meniscus lens D is 23.09mm, the air space between the positive meniscus lens D and the negative meniscus lens E is 37.09mm, the air space between the negative meniscus lens E and the negative meniscus lens F is 1.51mm, and the air space between the negative meniscus lens F and the biconvex positive lens G is 0.6mm.
In this embodiment, the optical system satisfies: -1< f1/f <2; -1< f2/f <2; -1< f3/f <2; -1< f4/f <2; -1< f5/f <2;2< 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 positive meniscus lens A, the negative meniscus lens B, the negative meniscus lens C, the positive meniscus lens D, the negative meniscus lens E, the negative meniscus 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 surfaces are expressed as follows:
wherein Z represents the position in the direction of the optical axis, r represents the height in the direction perpendicular to the optical axis, c represents the radius of curvature, k represents the conic coefficient,and represents aspherical coefficients. In the case of the aspherical surface data, E-n represents "-">", e.g., 9.1996E-005 represents +.>。
In this embodiment, a parallel plate is also included, which is located between the biconvex positive lens G and the IMA.
In this embodiment, specific performance parameters of the optical system are:
(1) Working spectral range: medium wave 3.7 um-4.8 um, long wave 7.5 um-9.5 um;
(2) F number: 3.0;
(3) Adapting the detector: 320×256@30um, 640×512@15um;
(4) Angle of view: not less than 3.6 degrees.
For a refrigeration type infrared system, in order to meet 100% cold diaphragm efficiency, the matching of the outlet pupil of an optical system and the cold diaphragm of a detector is ensured. In order to achieve 100% cold diaphragm efficiency, a primary imaging system can cause a radial caliber of a lens at the front end of the system to be larger, and the miniaturization of the system cannot be achieved. The embodiment adopts a structural type of secondary imaging, so that the radial caliber of each lens of the system can be reduced, the weight of the lens is reduced, and the volume of the lens is reduced. Because the working wave bands of the system are 3.7um to 4.8um and 7.5um to 9.5um, the coverage wave band range is large, so that the system has larger chromatic aberration. The structural model of the optical system consists of seven lenses, adopts three material combinations to carry out chromatic aberration correction, and uses even aspherical balance system aberration, so that the whole volume of the optical system is small enough. The sensitivity of each optical piece is reduced through the adjustment of curvature and thickness, so that the lens is easier to process and adjust.
In the embodiment, the dual-band infrared system remarkably 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 ships, infrared imaging guide heads of precise guided weapons and the like.
The data of the following table will illustrate the optical parameters of embodiments of the present invention:
table one: optical element parameter meter
And (II) table: aspheric related data
。
The invention has the advantages that:
a) The optical system is matched with the cold medium wave/long wave double-color infrared detector, can image the medium wave/long wave infrared radiation simultaneously, capture target information of two wave bands simultaneously, improve the detection and identification performance of the target in a complex background environment, obtain more comprehensive and accurate target information, and reduce the false alarm rate;
b) The infrared detectors capable of simultaneously responding to the middle wave/long wave bands share the same 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 structure form, so that 100% cold diaphragm efficiency is realized, and meanwhile, the whole radial dimension of the optical system is effectively compressed, and the miniaturization of the optical system is realized;
d) The working wave bands of the optical system are 3.7um to 4.8um and 7.5um to 9.5um, and the coverage wave band range is large, so that the system has larger chromatic aberration. The system adopts three material combinations to correct chromatic aberration, uses even aspherical balance system aberration, has simple structure and good manufacturability, and is convenient for processing and adjustment.
If the invention discloses or relates to components or structures fixedly connected with each other, then unless otherwise stated, the fixed connection is understood as: detachably fixed connection (e.g. using bolts or screws) can also be understood as: the non-detachable fixed connection (e.g. riveting, welding), of course, the mutual fixed connection may also be replaced by an integral structure (e.g. integrally formed using a casting process) (except for obviously being unable to use an integral forming process).
In addition, terms used in any of the above-described aspects of the present disclosure to express positional relationship or shape have meanings including a state or shape similar to, similar to or approaching thereto 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 embodiments are only for illustrating the technical solution of the present invention and not for limiting the same; while the invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present invention or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the invention, it is intended to cover the scope of the invention as claimed.
Claims (6)
1. The utility model provides a transmission type dual-band infrared lens which characterized in that: the optical system of the lens is sequentially arranged from the object side to the image side along the optical axis direction: a positive meniscus lens A with a convex surface facing the 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 silicon single crystal; the material of the meniscus negative lens B is germanium monocrystal; the material of the meniscus negative lens C is germanium monocrystal; the material of the meniscus positive lens D is silicon single crystal; the material of the meniscus negative lens E is germanium monocrystal; the material of the meniscus negative lens F is barium fluoride; the biconvex positive lens G is made of silicon single crystal;
the optical system satisfies: -1< f1/f <2; -1< f2/f <2; -1< f3/f <2; -1< f4/f <2; -1< f5/f <2;2< 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 positive meniscus lens A, the negative meniscus lens B, the negative meniscus lens C, the positive meniscus lens D, the negative meniscus lens E, the negative meniscus lens F, and the biconvex positive lens G, respectively.
2. The transmissive dual-band infrared lens of claim 1, wherein: the optical system is matched with a cold type medium wave/long wave double-color infrared detector.
3. The transmissive dual-band infrared lens of claim 1, wherein: the air space between the positive meniscus lens A and the negative meniscus lens B is 5.0mm, the air space between the negative meniscus lens B and the negative meniscus lens C is 41.55mm, the air space between the negative meniscus lens C and the positive meniscus lens D is 23.09mm, the air space between the positive meniscus lens D and the negative meniscus lens E is 37.09mm, the air space between the negative meniscus lens E and the negative meniscus lens F is 1.51mm, and the air space between the negative meniscus lens F and the biconvex positive lens G is 0.6mm.
4. The transmissive dual-band infrared lens of claim 1, wherein: the image side of the meniscus negative lens B, the image side of the meniscus negative lens C, the object side of the meniscus positive lens D, the image side of the meniscus negative lens E, the image side of the meniscus negative lens F and the object side of the biconvex positive lens G are even aspheric surfaces.
5. The transmissive dual-band infrared lens of claim 1, wherein: and further comprises a parallel plate positioned between the biconvex positive lens G and the IMA.
6. The transmissive dual-band infrared lens of 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.
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| CN202211470466.9A CN115685507B (en) | 2022-11-23 | 2022-11-23 | Transmission type dual-band infrared lens |
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| CN202211470466.9A CN115685507B (en) | 2022-11-23 | 2022-11-23 | Transmission type dual-band infrared lens |
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| CN115685507B true CN115685507B (en) | 2024-03-15 |
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Citations (6)
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| 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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