CN108333729A - Large-caliber infrared optical system - Google Patents
Large-caliber infrared optical system Download PDFInfo
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- CN108333729A CN108333729A CN201810116796.5A CN201810116796A CN108333729A CN 108333729 A CN108333729 A CN 108333729A CN 201810116796 A CN201810116796 A CN 201810116796A CN 108333729 A CN108333729 A CN 108333729A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 59
- 238000003384 imaging method Methods 0.000 claims abstract description 10
- 238000005057 refrigeration Methods 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 229910052732 germanium Inorganic materials 0.000 claims description 3
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 3
- 230000005855 radiation Effects 0.000 abstract description 3
- 238000001228 spectrum Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000003331 infrared imaging Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 210000001747 pupil Anatomy 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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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
- G02B13/14—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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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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Abstract
The invention discloses a large-aperture infrared optical system which is used for imaging target radiation of a medium-wave spectrum waveband at infinite distance on a medium-wave infrared detector. The large-aperture infrared optical system consists of two reflectors and thirteen lenses with curved surfaces, and sequentially comprises a primary mirror (1), a secondary mirror (2), a first lens (3), a second lens (4), a third lens (5), a fourth lens (6), a fifth lens (7), a sixth lens (8), a seventh lens (9), an eighth lens (10), a ninth lens (11), a tenth lens (12), an eleventh lens (13), a twelfth lens (14), a thirteenth lens (15), a window (16) of a medium-wave infrared detector, a filter (17) of the medium-wave infrared detector and a target surface (18) of the medium-wave detector from the incident direction of light beams. The large-aperture infrared optical system has the advantages of small obscuration, small lens aperture, good imaging quality and the like.
Description
Technical Field
The invention belongs to the field of optical application, and particularly relates to a large-caliber infrared optical system.
Background
The infrared detection system detects and identifies the target by detecting the infrared radiation characteristic of the target, has the advantages of passive detection, strong concealment, strong anti-interference performance, capability of realizing all-weather detection and search and the like, can penetrate through the limit of weather under poor weather conditions of poor visibility such as smoke, fog, snow, haze, sand storm and the like, and has the advantages of multi-target panoramic observation, tracking, target identification capability, good target stealth resistance and the like. Infrared imaging technology has thus become a hotspot in current design tracking systems.
The design of a compact refractive medium-wave infrared searching/tracking optical system by Chenjingjin et al, which is reported in journal 2008 of Kunming physical research institute, has an entrance pupil diameter of 100mm and a focal length of 200mm, and adopts a cubic imaging optical structure. CN103631003 in 2013 reports that fujianfigungchang limited company designs a long-wave infrared refrigeration type long-focus, large-caliber and large-field-of-view lens, which adopts a refraction type optical structure form, has an entrance pupil diameter of 239.5mm and a focal length of 407mm, and adopts a secondary imaging optical structure.
The invention discloses an infrared imaging system with large caliber, which is a small-caliber optical system, is mostly short in working distance and cannot meet the requirement of remote observation, so that the infrared imaging system with large caliber, long focal length and long working distance overcomes the defects, and has the research purpose of the invention.
Disclosure of Invention
The invention provides a large-aperture infrared optical system which is used for imaging target radiation of a medium-wave spectrum waveband at infinite distance on a medium-wave infrared detector. The large-aperture infrared optical system consists of two reflectors and thirteen lenses with curved surfaces.
The technical scheme adopted by the invention is as follows: a large-aperture infrared optical system comprises a primary mirror, a secondary mirror, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens, a fourteenth lens, a fifteenth lens and an image plane which are sequentially arranged from a light beam incidence direction; the large-aperture infrared optical system is a tertiary imaging system, a primary image plane is arranged between a secondary mirror and a first lens, a secondary image plane is arranged between a seventh lens and an eighth lens, and the tertiary image plane is the target surface of the medium wave detector; wherein,
the main mirror surface is a paraboloid, and the ratio of the focal length of the main mirror surface to the total focal length of the system is between-0.7 and-0.5;
the secondary mirror surface type is a hyperboloid, and the ratio of the focal length of the secondary mirror surface type to the total focal length of the system is between-0.23 and-0.16;
the first lens at least comprises an aspheric surface, and the ratio of the focal length of the first lens to the total focal length of the system is 0.026-0.032;
the second lens at least comprises an aspheric surface, and the ratio of the focal length of the second lens to the total focal length of the system is between-0.009 and-0.006;
the ratio of the focal length of the third lens to the total focal length of the system is 0.005-0.022;
the fourth lens at least comprises an aspheric surface, and the ratio of the focal length of the fourth lens to the total focal length of the system is-0.072 to-0.045;
the ratio of the focal length of the fifth lens to the total focal length of the system is 0.012-0.028;
the sixth lens at least comprises an aspheric surface, and the ratio of the focal length of the sixth lens to the total focal length of the system is-0.024 to-0.011;
the seventh lens at least comprises an aspheric surface, and the ratio of the focal length of the seventh lens to the total focal length of the system is 0.05-0.09;
the ratio of the focal length of the eighth lens to the total focal length of the system is 0.08-0.13;
the ninth lens at least comprises an aspheric surface, and the ratio of the focal length of the ninth lens to the total focal length of the system is 0.02-0.07;
the tenth lens at least comprises an aspheric surface, and the ratio of the focal length of the tenth lens to the total focal length of the system is 0.02-0.05;
the eleventh lens at least comprises an aspheric surface, and the ratio of the focal length of the eleventh lens to the total focal length of the system is between-0.04 and-0.01;
the ratio of the focal length of the twelfth lens to the total focal length of the system is 0.012-0.029;
the thirteenth lens at least comprises an aspheric surface, and the ratio of the focal length of the thirteenth lens to the total focal length of the system is 0.54-0.72;
the window of the medium wave infrared detector is a protection window of the refrigeration type medium wave infrared detector, and the protection window is a parallel flat plate made of germanium;
the optical filter of the medium wave infrared detector is an optical filter of the refrigeration type medium wave infrared detector, and the optical filter is a parallel flat plate made of silicon.
Wherein, the obscuration ratio of the large-caliber infrared optical system is 0.24.
Wherein, the working waveband of the large-caliber infrared optical system is 3.7-4.8 μm of medium wave infrared.
The invention has the following advantages:
1. most of the focal power of the large-aperture infrared optical system is borne by the primary mirror and the secondary mirror, compared with the lens, the reflector is easier to realize large aperture, and the size and the weight of the lens are effectively reduced by adopting a three-time imaging structure form.
2. The large-caliber infrared optical system has larger caliber and longer acting distance.
3. All optical elements except silicon in the large-caliber infrared optical system can be turned by a diamond lathe, and the processing precision is high.
Drawings
Fig. 1 is a schematic light path diagram of a large-aperture infrared optical system according to the present invention. FIG. 1 illustrates by reference numerals: the infrared detector comprises a primary mirror 1, a secondary mirror 2, a first lens 3, a second lens 4, a third lens 5, a fourth lens 6, a fourth lens 4, a fifth lens 7, a sixth lens 8, a seventh lens 9, an eighth lens 10, a ninth lens 11, a tenth lens 12, an eleventh lens 13, a twelfth lens 14, a thirteenth lens 15, a thirteenth lens 16, a window of a medium wave infrared detector 17, a filter of a medium wave infrared detector 17 and a target surface of a medium wave detector 18.
Fig. 2 is a partial two-dimensional optical path diagram of a large-aperture infrared optical system of the present invention.
Fig. 3 is a schematic MTF curve of the large-aperture infrared optical system of the present invention.
FIG. 4 is a graph of field curvature and distortion for a large aperture infrared optical system of the present invention.
Detailed Description
To better illustrate the objects and advantages of the present invention, the present invention is further described below with reference to FIG. 2 and the specific embodiments.
Fig. 1 is a schematic diagram of an optical path of a large-aperture infrared optical system according to the present invention, where light rays are converged by a primary mirror 1 and a secondary mirror 2 to form a primary image, the light rays then pass through a first lens 3, a second lens 4, a third lens 5, a fourth lens 6, a fifth lens 7, a sixth lens 8, and a seventh lens 9 to form a secondary image, and the light rays then pass through an eighth lens 10, a ninth lens 11, a tenth lens 12, an eleventh lens 13, a twelfth lens 14, a thirteenth lens 15, a window 16 of a medium wave infrared detector, and a filter 17 of the medium wave infrared detector and then reach a target surface 18 of the medium wave infrared detector.
The fourteenth lens 16, the fifteenth lens 17 and the image plane 18 form a medium wave infrared detector, the large-aperture infrared optical system is a tertiary imaging system, a primary image plane is between the secondary mirror 2 and the first lens 3, a secondary image plane is between the seventh lens 9 and the eighth lens 10, and the tertiary image plane is a target surface of the infrared detector;
the surface type of the primary mirror 1 is a paraboloid, and the ratio of the focal length of the primary mirror to the total focal length of the system is between-0.7 and-0.5;
the surface type of the secondary mirror 2 is a hyperboloid, and the ratio of the focal length of the secondary mirror to the total focal length of the system is-0.23 to-0.16;
the first lens 3 at least comprises an aspheric surface, and the ratio of the focal length of the first lens to the total focal length of the system is 0.026-0.032;
the second lens 4 at least comprises an aspheric surface, and the ratio of the focal length of the second lens to the total focal length of the system is between-0.009 and-0.006;
the ratio of the focal length of the third lens 5 to the total focal length of the system is 0.005-0.022;
the fourth lens 6 at least comprises an aspheric surface, and the ratio of the focal length of the fourth lens to the total focal length of the system is-0.072 to-0.045;
the ratio of the focal length of the fifth lens 7 to the total focal length of the system is 0.012-0.028;
the sixth lens 8 at least comprises an aspheric surface, and the ratio of the focal length of the sixth lens to the total focal length of the system is-0.024-0.011;
the seventh lens 9 at least comprises an aspheric surface, and the ratio of the focal length of the seventh lens to the total focal length of the system is 0.05-0.09;
the ratio of the focal length of the eighth lens 10 to the total focal length of the system is 0.08-0.13;
the ninth lens 11 at least comprises an aspheric surface, and the ratio of the focal length of the ninth lens to the total focal length of the system is 0.02-0.07;
the tenth lens 12 at least comprises an aspheric surface, and the ratio of the focal length of the tenth lens to the total focal length of the system is 0.02-0.05;
the eleventh lens 13 at least comprises an aspheric surface, and the ratio of the focal length of the eleventh lens to the total focal length of the system is between-0.04 and-0.01;
the ratio of the focal length of the twelfth lens 14 to the total focal length of the system is 0.012-0.029;
the thirteenth lens 15 at least comprises an aspheric surface, and the ratio of the focal length of the thirteenth lens to the total focal length of the system is between 0.54 and 0.72;
the window 16 of the medium wave infrared detector is a protection window of the refrigeration type medium wave infrared detector, and the protection window is a parallel flat plate made of germanium;
the optical filter 17 of the medium wave infrared detector is an optical filter of the refrigeration type medium wave infrared detector, and the optical filter is a parallel flat plate made of silicon.
The obscuration ratio of the large-aperture infrared optical system was 0.24.
The working waveband of the large-caliber infrared optical system is 3.7-4.8 mu m of medium wave infrared.
Fig. 2 is a partial optical path schematic diagram of a large-aperture infrared optical system according to the present invention, which is a partial optical path diagram of a refractive portion.
The specific optimization measure of this embodiment is to apply optical design software to construct an optimization function, and add aberration and structural constraint parameters, so as to gradually optimize the function into the existing result.
The embodiment is realized by the following technical measures: the working wave band of the system is 3.7-4.8 μm of medium wave infrared, the aperture of the primary mirror is 600mm, the focal length of the system is 1200mm, and the field of view is 0.6 deg.
An MTF curve is an important evaluation index of the large-aperture infrared optical system, fig. 3 is a schematic diagram of the MTF curve of the large-aperture infrared optical system, and the abscissa and the ordinate are a spatial frequency on an image plane and a modulation transfer function value of the optical system respectively, so that the MTF of the large-aperture infrared optical system is basically better than 0.6 at a spatial frequency of 20lp/mm and is close to a diffraction limit, which indicates that the large-aperture infrared optical system has better imaging quality in a full field of view.
The distortion is the off-axis aberration, which is the difference between the height of the intersection point of the main light of the off-axis point on the image plane and the ideal image height, the distortion does not affect the definition of the image, the resolution of the system is not reduced, and the distortion only causes the size of the image and the image to have some changes. Fig. 4 is a graph of field curvature and distortion of the large-aperture infrared optical system of the present invention, wherein the right graph is a distortion curve of each field of view of the optical system, and the abscissa and the ordinate are respectively a distortion value and a field of view, which shows that the distortion in the full field of view is less than 1.5%, and has a smaller distortion.
Claims (3)
1. A large-caliber infrared optical system is characterized in that: the device comprises a primary mirror (1), a secondary mirror (2), a first lens (3), a second lens (4), a third lens (5), a fourth lens (6), a fifth lens (7), a sixth lens (8), a seventh lens (9), an eighth lens (10), a ninth lens (11), a tenth lens (12), an eleventh lens (13), a twelfth lens (14), a thirteenth lens (15), a window (16) of a medium wave infrared detector, a light filter (17) of the medium wave infrared detector and a target surface (18) of the medium wave detector which are sequentially arranged from the incident direction of light beams; a window (16) of the medium wave infrared detector, an optical filter (17) of the medium wave infrared detector and a target surface (18) of the medium wave detector form the medium wave infrared detector, the large-aperture infrared optical system is a tertiary imaging system, a primary image plane is arranged between a secondary lens (2) and a first lens (3), a secondary image plane is arranged between a seventh lens (9) and an eighth lens (10), and the tertiary image plane is the target surface (18) of the medium wave detector; wherein,
the surface of the primary mirror (1) is a paraboloid, and the ratio of the focal length of the primary mirror to the total focal length of the system is between-0.7 and-0.5;
the surface of the secondary mirror (2) is a hyperboloid, and the ratio of the focal length of the secondary mirror to the total focal length of the system is-0.23 to-0.16;
the first lens (3) at least comprises an aspheric surface, and the ratio of the focal length of the first lens to the total focal length of the system is 0.026-0.032;
the second lens (4) at least comprises an aspheric surface, and the ratio of the focal length of the second lens to the total focal length of the system is between-0.009 and-0.006;
the ratio of the focal length of the third lens (5) to the total focal length of the system is 0.005-0.022;
the fourth lens (6) at least comprises an aspheric surface, and the ratio of the focal length of the fourth lens to the total focal length of the system is-0.072 to-0.045;
the ratio of the focal length of the fifth lens (7) to the total focal length of the system is 0.012-0.028;
the sixth lens (8) at least comprises an aspheric surface, and the ratio of the focal length of the sixth lens to the total focal length of the system is-0.024-0.011;
the seventh lens (9) at least comprises an aspheric surface, and the ratio of the focal length of the seventh lens to the total focal length of the system is 0.05-0.09;
the ratio of the focal length of the eighth lens (10) to the total focal length of the system is 0.08-0.13;
the ninth lens (11) at least comprises an aspheric surface, and the ratio of the focal length of the ninth lens to the total focal length of the system is 0.02-0.07;
the tenth lens (12) at least comprises an aspheric surface, and the ratio of the focal length of the tenth lens to the total focal length of the system is 0.02-0.05;
the eleventh lens (13) at least comprises an aspheric surface, and the ratio of the focal length of the eleventh lens to the total focal length of the system is-0.04 to-0.01;
the ratio of the focal length of the twelfth lens (14) to the total focal length of the system is 0.012-0.029;
the thirteenth lens (15) at least comprises an aspheric surface, and the ratio of the focal length of the thirteenth lens to the total focal length of the system is 0.54-0.72;
a window (16) of the medium wave infrared detector is a protection window of the refrigeration type medium wave infrared detector, and the protection window is a parallel flat plate made of germanium;
the optical filter (17) of the medium wave infrared detector is an optical filter of the refrigeration type medium wave infrared detector, and the optical filter is a parallel flat plate made of silicon.
2. A large aperture infrared optical system according to claim 1, wherein: the obscuration ratio of the large-aperture infrared optical system was 0.24.
3. A large aperture infrared optical system according to claim 1, wherein: the working waveband of the large-caliber infrared optical system is 3.7-4.8 mu m of medium wave infrared.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810116796.5A CN108333729A (en) | 2018-02-06 | 2018-02-06 | Large-caliber infrared optical system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810116796.5A CN108333729A (en) | 2018-02-06 | 2018-02-06 | Large-caliber infrared optical system |
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| CN108333729A true CN108333729A (en) | 2018-07-27 |
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| CN201810116796.5A Pending CN108333729A (en) | 2018-02-06 | 2018-02-06 | Large-caliber infrared optical system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109343206A (en) * | 2018-09-28 | 2019-02-15 | 中国科学院长春光学精密机械与物理研究所 | A kind of infrared optical system and optical device |
| CN111290103A (en) * | 2020-02-20 | 2020-06-16 | 北京华北莱茵光电技术有限公司 | Large-area-array medium-wave infrared double-view-field optical system |
| CN111367042A (en) * | 2018-12-25 | 2020-07-03 | 中国科学院长春光学精密机械与物理研究所 | Large-caliber long-focus infrared bicolor optical lens and imaging device |
-
2018
- 2018-02-06 CN CN201810116796.5A patent/CN108333729A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109343206A (en) * | 2018-09-28 | 2019-02-15 | 中国科学院长春光学精密机械与物理研究所 | A kind of infrared optical system and optical device |
| CN109343206B (en) * | 2018-09-28 | 2020-09-01 | 中国科学院长春光学精密机械与物理研究所 | Infrared optical system and optical equipment |
| CN111367042A (en) * | 2018-12-25 | 2020-07-03 | 中国科学院长春光学精密机械与物理研究所 | Large-caliber long-focus infrared bicolor optical lens and imaging device |
| CN111367042B (en) * | 2018-12-25 | 2021-09-17 | 中国科学院长春光学精密机械与物理研究所 | Large-caliber long-focus infrared bicolor optical lens and imaging device |
| CN111290103A (en) * | 2020-02-20 | 2020-06-16 | 北京华北莱茵光电技术有限公司 | Large-area-array medium-wave infrared double-view-field optical system |
| CN111290103B (en) * | 2020-02-20 | 2021-11-23 | 北京华北莱茵光电技术有限公司 | Large-area-array medium-wave infrared double-view-field optical system |
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Application publication date: 20180727 |