CN220040863U - Long-wave infrared array scanning optical system - Google Patents
Long-wave infrared array scanning optical system Download PDFInfo
- Publication number
- CN220040863U CN220040863U CN202321028387.2U CN202321028387U CN220040863U CN 220040863 U CN220040863 U CN 220040863U CN 202321028387 U CN202321028387 U CN 202321028387U CN 220040863 U CN220040863 U CN 220040863U
- Authority
- CN
- China
- Prior art keywords
- lens
- mirror
- group
- collimating
- long
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 77
- 238000003384 imaging method Methods 0.000 claims abstract description 35
- 230000005499 meniscus Effects 0.000 claims description 28
- 229910052732 germanium Inorganic materials 0.000 claims description 22
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 22
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 7
- 229910052717 sulfur Inorganic materials 0.000 claims description 7
- 239000011593 sulfur Substances 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 abstract description 8
- 210000001747 pupil Anatomy 0.000 description 11
- 239000000463 material Substances 0.000 description 9
- 230000010354 integration Effects 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000005855 radiation Effects 0.000 description 4
- 238000005057 refrigeration Methods 0.000 description 4
- 230000033001 locomotion Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 229910052738 indium Inorganic materials 0.000 description 2
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 2
- 238000003331 infrared imaging Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 150000004770 chalcogenides Chemical class 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000002241 glass-ceramic Substances 0.000 description 1
- 210000003128 head Anatomy 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Landscapes
- Lenses (AREA)
Abstract
The utility model discloses a long-wave infrared array scanning optical system, which comprises a telescope group, a scanning galvanometer, a first imaging group and an image surface, wherein the telescope group, the scanning galvanometer, the first imaging group and the image surface are sequentially arranged in an object direction, the telescope group comprises a primary mirror, a secondary mirror, a first collimating mirror group, a first turning mirror group and a second collimating mirror group, the scanning galvanometer is in a fixed state and a retrace state moving towards a direction close to or far from the second collimating mirror group, and light rays pass through the primary mirror, the secondary mirror, the first turning mirror group and the scanning galvanometer to be turned, wherein the working wave band of the long-wave infrared array scanning optical system is 7.7-10.5 mu m, the focal length is 600mm, and the F number range is 2-5.5. The light is folded for many times in the transmission process, the design is flexible, and the large view field and the compact design are facilitated.
Description
Technical Field
The utility model relates to the technical field of optical systems, in particular to a long-wave infrared array scanning optical system.
Background
In the existing long-wave infrared scanning optical system for the red searching and tracking system, a 288×4 refrigeration type detector with a long-wave linear array is adopted, and although the omnidirectional scanning imaging can be realized, the integration time is limited by the scanning speed, and the time spent in each pixel is usually tens of microseconds, so that the output signal intensity is lower and the signal-to-noise ratio is limited. In practical applications, there are great limitations to the ability to detect objects, especially for remote objects.
The other type adopts a staring type area array focal plane detector, the integration time is much longer and is in the millisecond order, so that the detection capability is greatly improved. Typically, the field of view of a staring area array detector is limited. In particular, to increase the range, the focal length of a typical staring infrared imaging system is as long as possible to obtain a smaller instantaneous field of view. This results in a field of view that does not cover the desired airspace. If a mode of staring in a multi-area array detector by dividing the field of view is adopted, the volume and the quality of the system are greatly increased, and the cost is high. Therefore, the continuous scanning type area array detector imaging system has application value. However, scanning of a continuously scanned area array imaging system over the integration time can result in relative motion between the focal plane and the scene, causing smearing and blurring of the image.
Therefore, how to optimize the long-wave infrared scanning optical system is still a continuous need for those skilled in the art.
Disclosure of Invention
The utility model mainly aims to provide a long-wave infrared array scanning optical system which has the design characteristics of large caliber and long focal length, is repeatedly folded in the light transmission process, is flexible in design, introduces a scanning vibrating mirror into a parallel light path, and is swung in opposite directions at a specific speed by the scanning vibrating mirror in the integration time of an array detector to compensate the change of a position visual field.
In order to achieve the above purpose, the utility model provides a long-wave infrared array scanning optical system, which comprises a telescope set, a scanning vibrating mirror, a first imaging set and an image plane, wherein the telescope set, the scanning vibrating mirror, the first imaging set and the image plane are sequentially arranged in an object direction, the telescope set comprises a primary mirror, a secondary mirror, a first collimating mirror set, a first turning mirror set and a second collimating mirror set, the scanning vibrating mirror is in a fixed state and a retrace state moving towards a direction approaching to or far from the second collimating mirror set, and light rays pass through the primary mirror, the secondary mirror, the first turning mirror set and the scanning vibrating mirror to be turned;
the working wave band of the long-wave infrared array scanning optical system is 7.7-10.5 mu m, the focal length is 600mm, and the F number range is more than or equal to 2 and less than or equal to 5.5.
Optionally, the primary mirror is a negative power meniscus mirror and the secondary mirror is a negative power meniscus mirror.
Optionally, the first collimating lens group comprises a first collimating lens, a second collimating lens and a third collimating lens which are sequentially arranged in the object direction and the image direction;
the first collimating lens is a meniscus type aspheric sulfur lens with negative focal power bent towards an image space, the second collimating lens is a meniscus type aspheric germanium lens with negative focal power bent towards an object space, and the third collimating lens is a meniscus type aspheric germanium lens with positive focal power bent towards the object space.
Optionally, the first refractive lens group includes first speculum, fourth collimating lens and the second speculum that sets gradually by object direction image side, the second speculum with first speculum all is the contained angle setting with the optical axis for turn over the light path, first speculum with first collimating lens group is arranged along same straight line.
Optionally, the included angles between the first reflecting mirror and the optical axis and between the second reflecting mirror and the optical axis are 45 degrees; and/or the number of the groups of groups,
the fourth collimating lens is a meniscus lens with positive focal power bent towards the image side.
Optionally, the second collimating lens group includes a fifth collimating lens and a sixth collimating lens sequentially arranged from an object direction image space, wherein the fifth collimating lens is a meniscus-shaped aspheric germanium lens with negative focal power bent to the object space; the sixth collimating lens is a meniscus-type aspheric sulfur lens with positive focal power bent to the object image.
Optionally, the first imaging group includes a first lens, a second lens, a third mirror, a third lens and a fourth lens sequentially disposed in an object direction image space;
the first lens is a meniscus type aspheric germanium lens with positive focal power bent towards an image space, the second lens is a meniscus type aspheric germanium lens with positive focal power bent towards an object space, an included angle between the third reflector and an optical axis is 45 degrees and is used for turning an optical path, the third lens is a meniscus type aspheric germanium lens with positive focal power bent towards the image space, and the fourth lens is a biconvex type spherical germanium lens with positive focal power.
Optionally, the primary mirror is located between the first collimating mirror set and the first turning mirror set.
Optionally, the direction of the light rays entering the telescope set is opposite to the direction of the light rays entering the image plane.
Optionally, the included angle between the scanning galvanometer and the optical axis is 45 degrees.
In the technical scheme of the utility model, an imaging light beam from an object space passes through a primary mirror and a secondary mirror after being folded, enters a first folding mirror group after passing through a first collimating mirror group and is folded again, enters a first imaging group after passing through a second collimating mirror group and is folded through a scanning vibrating mirror, and finally forms an image on an image plane. The scanning galvanometer is designed to realize optical image stabilization through a refraction-reflection structure, the scanning galvanometer is introduced into a parallel light path, and the scanning galvanometer swings in opposite directions at a specific speed within the integral time of the area array detector, so that the change of a position view field is compensated. Specifically, the scanning galvanometer is positioned in a parallel light path, has two working states, mainly turns the light path when in a fixed state, is in a long-wave gaze tracking mode, has no defocus in imaging of an image plane when in a retrace state, and can be applied to a long-wave area array circumferential scanning searching mode. The structure has the design characteristics of large caliber and long focal length, and is repeatedly turned in the light transmission process, thereby being beneficial to reducing the whole volume, compressing the space size and realizing flexible whole design.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an embodiment of a long-wave infrared array scanning optical system provided by the utility model;
FIG. 2 is a graph of MTF corresponding to the long-wave infrared array scanning optical system of FIG. 1 at +20℃;
FIG. 3 is a graph of MTF corresponding to the long-wave infrared array scanning optical system of FIG. 1 at-55 ℃;
fig. 4 is a graph of MTF corresponding to the long-wave infrared array scanning optical system of fig. 1 at +70 ℃.
Reference numerals illustrate:
the achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the case where a directional instruction is involved in the embodiment of the present utility model, the directional instruction is merely used to explain the relative positional relationship, movement condition, etc. between the components in a specific posture, and if the specific posture is changed, the directional instruction is changed accordingly.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.
Because the airborne infrared searching and tracking system is mainly used for air combat, the airborne infrared searching and tracking system is mainly used for detecting and tracking the side direction or the head of an enemy plane. In the dead ahead or the side place ahead of aircraft, the short wave radiation of aircraft engine is mostly sheltered from by the organism, and the solar short wave infrared that the aircraft fuselage reflected is very weak moreover, considers simultaneously and surveys the demand round clock, and the airborne infrared search tracking system can not adopt short wave infrared band. Also, for the right front or side front of the enemy plane, most of the medium wave radiation of the tail gas flow of the engine nozzle is blocked, and the detection by using the medium wave infrared band is greatly affected. As forward detection, skin radiation is mainly long wave radiation, and the best scheme is to use long wave infrared band. Therefore, the onboard infrared searching and tracking system selects long-wave infrared as the working wave band of the system.
In the prior art, 2012, a large-view-field large-relative-aperture long-wave infrared scanning optical system is designed by the Western-type optical precision mechanical research institute of China academy of sciences, the focal length of the system is 21.5mm, F/1.67, and the system is matched with a 288 multiplied by 4 refrigeration type detector (Fan Zheyuan, yang Hongtao and the like; the large-view-field large-relative-aperture long-wave infrared scanning optical system is designed, and infrared and laser engineering is 2012 41 (10): 2740-2744).
In 2013, the long-wave infrared double-view-field scanning optical system is designed by the Luoyang electro-optical equipment institute of aviation industry group company, the focal length of the system is 165/66mm, F/1.67, and the long-wave linear array 288 multiplied by 4 refrigeration type detector (Qiao Mingxia, zeng Wei and the like) is matched with the long-wave infrared double-view-field scanning optical system, the electro-optical and control, 2013 20 (3): 77-80).
Therefore, the long-wave infrared scanning optical systems for the red searching and tracking system which are reported at present all adopt long-wave linear arrays 288 multiplied by 4 refrigeration type detectors, and although the full-range scanning imaging can be realized, the integration time is limited by the scanning speed, and the time spent in each pixel is usually tens of microseconds, so that the output signal intensity is lower and the signal-to-noise ratio is limited. Therefore, in practical applications, there is a great limitation in the ability to detect objects, especially for remote objects. The integration time of the gaze type area array focal plane detector is much longer and is in the millisecond level, so that the detection capability is greatly improved. Typically, the field of view of a staring area array detector is limited. In particular, to increase the range, the focal length of a typical staring infrared imaging system is as long as possible to obtain a smaller instantaneous field of view. This results in a field of view that does not cover the desired airspace. If a mode of staring in a multi-area array detector by dividing the field of view is adopted, the volume and the quality of the system are greatly increased, and the cost is high. Therefore, the continuous scanning type area array detector imaging system has application value. However, scanning of a continuously scanned area array imaging system over the integration time can result in relative motion between the focal plane and the scene, causing smearing and blurring of the image. This is the biggest obstacle to the application of area array detectors to scanning type systems.
In view of this, the present utility model provides a long-wave infrared array scanning optical system, and fig. 1 to 4 are embodiments of the long-wave infrared array scanning optical system provided by the present utility model.
Referring to fig. 1, a long-wave infrared array scanning optical system 100 includes a telescope set, a scanning galvanometer 2, a first imaging set 3 and an image plane sequentially disposed in an object direction, where the telescope set includes a primary mirror 11, a secondary mirror 12, a first collimating mirror set, a first turning mirror set and a second collimating mirror set sequentially disposed in the object direction, the scanning galvanometer 2 has a fixed state and a retrace state moving toward a direction approaching or separating from the second collimating mirror set, and light is turned over by the primary mirror 11, the secondary mirror 12, the first turning mirror set and the scanning galvanometer 2; wherein, the working wave band of the long wave infrared array scanning optical system 100 is 7.7-10.5 μm long wave, the focal length is 600mm, and the F number range is 2-5.5.
In the technical scheme of the utility model, an imaging light beam from an object space passes through a primary mirror 11 and a secondary mirror 12 after being folded, enters the first folding mirror group after passing through a first collimating mirror group and is folded again, enters the first imaging group 3 after passing through the second collimating mirror group and is folded through the scanning vibrating mirror 2, and finally forms an image on an image plane. The design of the scanning galvanometer 2 is to realize optical image stabilization through a refraction and reflection structure, the scanning galvanometer 2 is introduced into a parallel light path, and the scanning galvanometer 2 swings in opposite directions at a specific speed within the integral time of the area array detector, so as to compensate the change of the azimuth view field. Specifically, the scanning galvanometer 2 is located in a parallel light path, has two working states, and mainly turns the light path when in a fixed state, the optical system is in a long-wave gaze tracking mode, and the image plane imaging is free from defocus when in a retrace state, so that the scanning galvanometer can be applied to a long-wave area array circumferential scanning searching mode. The structure has the design characteristics of large caliber and long focal length, and is repeatedly turned in the light transmission process, thereby being beneficial to reducing the whole volume, compressing the space size and realizing flexible whole design.
Specifically, the primary mirror 11 is a meniscus mirror with negative optical power, and the secondary mirror 12 is a meniscus mirror with negative optical power.
Because the focal length of the optical system is longer, the primary lens 11 and the secondary lens 12 are selected to be used as the primary focal power, and the corresponding collimating lens group is selected to be used as the secondary focal power. The primary mirror 11 and the secondary mirror 12 are preferably low expansion glass ceramics. Considering the athermal design of the system, the optimal support material between the primary mirror 11 and the secondary mirror 12 is indium steel with small thermal expansion coefficient, and the optimal lens barrel material, the spacer ring material and the support lens barrel material in the transmission assembly are all aluminum, so that a good athermal effect can be achieved.
In order to ensure the collimation effect after the light is turned over, the first collimating lens group comprises a first collimating lens 13, a second collimating lens 14 and a third collimating lens 15 which are sequentially arranged in the image space of the object direction; the first collimating lens 13 is a meniscus type aspheric sulfur lens with negative focal power bent toward the image side, the second collimating lens 14 is a meniscus type aspheric germanium lens with negative focal power bent toward the object side, and the third collimating lens 15 is a meniscus type aspheric germanium lens with positive focal power bent toward the object side.
In order to further reduce the overall volume, the first refractive lens group includes a first reflecting mirror 16, a fourth collimating lens 17 and a second reflecting mirror 18 sequentially disposed in an object direction, where the second reflecting mirror 18 and the first reflecting mirror 16 are disposed at an included angle with an optical axis, and are used for deflecting an optical path, and the first reflecting mirror 16 and the first collimating lens group are arranged along the same straight line. That is, the secondary mirror 12, the first collimating mirror group and the first reflecting mirror 16 are arranged along the same straight line, the direction of refraction of the secondary mirror is changed by the first reflecting mirror 16, the arrangement of the fourth collimating lens 17 ensures the matching effect of the two reflecting mirrors, and the secondary mirror 18 is changed again, at this time, the transmission direction of the light is consistent with the initial incident direction.
It will be appreciated that the number of mirrors may be more or less depending on the actual space size design requirements, thereby achieving miniaturization of the volume by light ray refraction.
Preferably, the included angles between the first reflecting mirror 16 and the second reflecting mirror 18 and the optical axis are 45 °, so that the optical paths are sequentially turned by 90 °, and the first reflecting mirror and the second reflecting mirror are arranged along the same straight line, which is beneficial to reducing the length of the system. In other embodiments, the included angles of the two may be different, and the corresponding included angles may be 30 ° and 60 °, which is not limited in the present utility model.
Further, the fourth collimator lens 17 is a meniscus type chalcogenide lens with positive power bent toward the image side.
In order to ensure the angle of light entering the scanning galvanometer 2, the second collimating lens group comprises a fifth collimating lens 19a and a sixth collimating lens 19b which are sequentially arranged from the object direction to the image direction, wherein the fifth collimating lens 19a is a meniscus-shaped aspheric germanium lens with negative focal power bent to the object direction; the sixth collimator lens 19b is a meniscus aspherical sulfur lens having positive power bent toward the object image.
In order to ensure clear imaging, in the present embodiment, the first imaging group 3 includes a first lens 31, a second lens 32, a third mirror 33, a third lens 34, and a fourth lens 35, which are disposed in order from the object side; the first lens 31 is a meniscus type aspheric germanium lens with positive power bent toward the image side, the second lens 32 is a meniscus type aspheric germanium lens with positive power bent toward the object side, an included angle between the third mirror 33 and the optical axis is 45 ° for turning the optical path, the third lens 34 is a meniscus type aspheric germanium lens with positive power bent toward the image side, and the fourth lens 35 is a biconvex type aspheric germanium lens with positive power. It will be appreciated that in other embodiments, the number of lenses may be more or less, and may be designed according to a reasonable design pitch of the actual lens type.
The primary mirror 11 is located between the first collimating mirror set and the first turning mirror set. Besides, the incidence and the deflection of light rays are guaranteed through reasonable arrangement of different lens components, the structure is compact, and the space utilization rate is higher.
In this embodiment, the direction of the light incident on the telescope set is opposite to the direction of the light incident on the image plane. This limits the orientation of the image plane, further reducing the linear distance between the primary mirror 11 and the image plane.
The utility model is not limited to the angle between the reflecting mirror 14 and the optical axis, in this embodiment, the angle between the reflecting mirror 14 and the optical axis is 45 °, i.e. the optical path is turned by 90 °, which is beneficial to reducing the system length. In other embodiments, the angle between the reflecting mirror 14 and the optical axis may be 30 °, 60 °, etc., which is not limited by the present utility model.
Specifically, fig. 2 to 4 in the present embodiment are MTF graphs at different temperatures, which can reflect the characteristics of the optical system in the present embodiment.
In order to quickly and effectively design a better optical structure, the utility model provides a method for combining design by utilizing parameter setting and optical design software, which comprises the following specific design steps:
step 1: the minimum field of view increment of the telescope group meeting the flyback compensation without vignetting or light blocking is determined according to the rotating speed of the rotary table,
ΔωFOV＝ωt
wherein omega is the rotating speed of the turntable, and t is the integration time of the optical system area array detector;
the total field of view of the telescopic system is obtained as,
ωFOV＝ωmax+ΔωFOV
wherein ωmax is the required maximum value of the field of view in the optical system;
step 2: determining the diameter of an exit pupil in the telescope set, namely the size of the corresponding scanning galvanometer 2, according to the diameter of an entrance pupil of the telescope set and the limitation of the structural size;
step 3: determining the focal length F0 'of the objective lens group and the focal length fe' of the eyepiece lens group according to the multiplying power M=f0 '/fe' of the telescope group and the F number of the system;
step 4: the exit pupil position of the telescope group is strictly matched with the entrance pupil position of the first imaging group 3, and the scanning galvanometer 2 is placed at the entrance pupil position of the first imaging group 3;
step 5: matching and optimizing the telescope group and the first imaging group 3 to obtain a long-wave composite area array scanning optical system;
step 6: the athermal design is carried out on the medium-and-long wave composite area array scanning optical system by considering the thermal expansion coefficients of the optical lens and the lens barrel structural member and the displacement of the long wave infrared detector at high and low temperatures, so that the temperature range of-55 ℃ to +70 ℃ is satisfied.
Compared with the prior art, the technical scheme of the utility model has the following advantages:
the telescope group adopts a structure type that a reflecting mirror is combined with a lens for one-time imaging, and simultaneously, in order to reduce the volume, the light beam is folded for a plurality of times, so that the space size is compressed, and as the focal length of an optical system is longer, the primary mirror 11 and the secondary mirror 12 are selected to be taken as the primary focal power, and the collimating lens group is taken as the secondary focal power. The primary and secondary reflectors are made of low-expansion microcrystalline glass, and the collimating lens group is made of two optical materials of germanium and sulfur.
Considering the athermalization design of the system, the optimal supporting material between the primary mirror 11 and the secondary mirror 12 is indium steel with small thermal expansion coefficient, and the optimal lens barrel material, the spacer ring material and the supporting lens barrel material in the transmission assembly are all aluminum, so that a good athermalization effect can be achieved.
The athermal design is carried out on the long-wave area array scanning optical system by considering the thermal expansion coefficients of the optical lens and the lens barrel structural member and the displacement of the long-wave infrared detector at high and low temperatures, thereby meeting the temperature range of minus 55 ℃ to plus 70 ℃.
In order to effectively reduce the caliber of the primary mirror 11 and the caliber of the transmission mirror group, and meet the light weight design requirement of the system, the telescope group adopts a one-time imaging structure, and the entrance pupil position of the optical system is positioned near the primary mirror 11 of the telescope system; the first imaging group 3 adopts a one-time imaging structure, the exit pupil of the first imaging group 3 is overlapped with the cold diaphragm of the detector, the efficiency of the cold diaphragm reaches 100 percent, and the whole long-wave area array scanning system is in a three-time imaging structure.
The exit pupil position of the telescope group is strictly matched with the entrance pupil position of the first imaging group 3, and the scanning galvanometer 2 is placed at the entrance pupil position of the first imaging group 3;
to reduce the size of the galvanometer, the exit pupil position of the telescope set is located near the scanning galvanometer 2. When the scanning galvanometer 2 is in a system circumferential scanning working state, the working frequency reaches 50-100 Hz, so that the galvanometer is required to be small in size and light in weight.
The distortion value caused by the back swing of the scanning galvanometer 2 is controlled to be less than 0.5%, so that the accurate registration of images in the full view field range in the scanning process is ensured, and the imaging definition and stability are ensured.
The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model.
Claims (10)
1. The long-wave infrared array scanning optical system is characterized by comprising a telescope group, a scanning galvanometer, a first imaging group and an image surface, wherein the telescope group, the scanning galvanometer, the first imaging group and the image surface are sequentially arranged in an object direction, the telescope group comprises a primary mirror, a secondary mirror, a first collimating mirror group, a first turning mirror group and a second collimating mirror group, the primary mirror, the secondary mirror, the first collimating mirror group and the second collimating mirror group are sequentially arranged in the object direction, the scanning galvanometer has a fixed state and a retrace state which moves towards a direction close to or far from the second collimating mirror group, and light passes through the primary mirror, the secondary mirror, the first turning mirror group and the scanning galvanometer to turn;
the working wave band of the long-wave infrared array scanning optical system is 7.7-10.5 mu m, the focal length is 600mm, and the F number range is more than or equal to 2 and less than or equal to 5.5.
2. The long wave infrared array scanning optical system of claim 1, wherein the primary mirror is a negative power meniscus mirror and the secondary mirror is a negative power meniscus mirror.
3. The long-wave infrared array scanning optical system of claim 1, wherein the first collimating lens group comprises a first collimating lens, a second collimating lens and a third collimating lens which are sequentially arranged in an object direction image space;
the first collimating lens is a meniscus type aspheric sulfur lens with negative focal power bent towards an image space, the second collimating lens is a meniscus type aspheric germanium lens with negative focal power bent towards an object space, and the third collimating lens is a meniscus type aspheric germanium lens with positive focal power bent towards the object space.
4. The long-wave infrared array scanning optical system of claim 1, wherein the first refractive lens group comprises a first reflecting mirror, a fourth collimating lens and a second reflecting mirror which are sequentially arranged in an object direction image space, the second reflecting mirror and the first reflecting mirror are all arranged at an included angle with an optical axis and used for refracting an optical path, and the first reflecting mirror and the first collimating lens group are arranged along the same straight line.
5. The long-wave infrared array scanning optical system of claim 4, wherein the included angles between the first reflecting mirror and the optical axis and the second reflecting mirror are both 45 degrees; and/or the number of the groups of groups,
the fourth collimating lens is a meniscus lens with positive focal power bent towards the image side.
6. The long-wave infrared array scanning optical system of claim 1, wherein the second collimating lens group comprises a fifth collimating lens and a sixth collimating lens which are sequentially arranged from an object direction image side, wherein the fifth collimating lens is a meniscus-type aspheric germanium lens with negative focal power bent to the object side; the sixth collimating lens is a meniscus-type aspheric sulfur lens with positive focal power bent to the object image.
7. The long-wave infrared array scanning optical system of claim 1, wherein the first imaging group comprises a first lens, a second lens, a third mirror, a third lens and a fourth lens sequentially arranged from an object-side image side;
the first lens is a meniscus type aspheric germanium lens with positive focal power bent towards an image space, the second lens is a meniscus type aspheric germanium lens with positive focal power bent towards an object space, an included angle between the third reflector and an optical axis is 45 degrees and is used for turning an optical path, the third lens is a meniscus type aspheric germanium lens with positive focal power bent towards the image space, and the fourth lens is a biconvex type spherical germanium lens with positive focal power.
8. The long wave infrared array scanning optical system of claim 1, wherein the primary mirror is located between the first collimating mirror set and the first turning mirror set.
9. The long-wave infrared array scanning optical system of claim 1, wherein the direction of light rays entering the telescope set is opposite to the direction of light rays entering the image plane.
10. The long wave infrared array scanning optical system of claim 1, wherein the scanning galvanometer is at an angle of 45 ° to the optical axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321028387.2U CN220040863U (en) | 2023-04-24 | 2023-04-24 | Long-wave infrared array scanning optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321028387.2U CN220040863U (en) | 2023-04-24 | 2023-04-24 | Long-wave infrared array scanning optical system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220040863U true CN220040863U (en) | 2023-11-17 |
Family
ID=88733937
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321028387.2U Active CN220040863U (en) | 2023-04-24 | 2023-04-24 | Long-wave infrared array scanning optical system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220040863U (en) |
-
2023
- 2023-04-24 CN CN202321028387.2U patent/CN220040863U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6333811B1 (en) | All-reflective zoom optical imaging system | |
| CN110749986B (en) | Infrared continuous zoom area array scanning optical system and image shift compensation method | |
| CN110780432B (en) | Non-coaxial total reflection type active zooming relay optical system without moving element | |
| CN210690931U (en) | Long-wave infrared zooming optical system for 1K detector | |
| CN209198755U (en) | A kind of short-wave infrared continuous magnification lens | |
| CN110596872B (en) | Medium wave infrared continuous zooming system with reciprocating compensation group | |
| CN116243470A (en) | Focusing ultra-long wave infrared optical imaging system used under low temperature condition | |
| CN109387931A (en) | A kind of short-wave infrared continuous magnification lens | |
| CN210090814U (en) | Long-focus medium-wave infrared refrigeration double-view-field lens | |
| CN102364372A (en) | Multispectral refraction-reflection type optical system | |
| CN113866967B (en) | Low-cost light-weight small-sized medium-wave infrared continuous zooming optical system | |
| CN213690096U (en) | Medium wave refrigeration infrared continuous zooming optical system | |
| CN220040863U (en) | Long-wave infrared array scanning optical system | |
| CN116540401A (en) | Long-wave infrared array scanning optical system | |
| CN107121760A (en) | A kind of infrared refractive and reflective panorama camera lens of broadband refrigeration | |
| CN210864179U (en) | Non-coaxial total reflection type active zooming relay optical system without moving element | |
| CN104090350A (en) | Long-wave infrared objective lens | |
| CN219758574U (en) | Image shift compensation optical system and aerial remote sensing system | |
| CN218037516U (en) | Optical lens system | |
| CN219574483U (en) | Common aperture dual wave optical system | |
| CN220040862U (en) | Folding type medium wave infrared vibration scanning optical system | |
| CN219758581U (en) | Area array scanning infrared optical system | |
| CN218497244U (en) | Optical lens system | |
| CN115166955B (en) | Radiation-proof uncooled infrared continuous zooming optical system and optical lens | |
| CN216285938U (en) | Miniaturized large-zoom-ratio medium-wave infrared continuous zoom lens |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |