CN116449559A - Folding type medium wave infrared vibration scanning optical system - Google Patents
Folding type medium wave infrared vibration scanning optical system Download PDFInfo
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- CN116449559A CN116449559A CN202310487457.9A CN202310487457A CN116449559A CN 116449559 A CN116449559 A CN 116449559A CN 202310487457 A CN202310487457 A CN 202310487457A CN 116449559 A CN116449559 A CN 116449559A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 80
- 238000003384 imaging method Methods 0.000 claims abstract description 29
- 230000005499 meniscus Effects 0.000 claims description 24
- 229910052732 germanium Inorganic materials 0.000 claims description 13
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 13
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 10
- 229910052710 silicon Inorganic materials 0.000 claims description 10
- 239000010703 silicon Substances 0.000 claims description 10
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 3
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 abstract description 4
- 238000011105 stabilization Methods 0.000 abstract description 4
- 210000001747 pupil Anatomy 0.000 description 12
- 239000000463 material Substances 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 7
- 230000004075 alteration Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 206010010071 Coma Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000000887 face Anatomy 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/105—Scanning systems with one or more pivoting mirrors or galvano-mirrors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4817—Constructional features, e.g. arrangements of optical elements relating to scanning
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
Abstract
The invention discloses a foldback type medium wave infrared vibration scanning optical system, which comprises a telescope set, a scanning vibration mirror, a first imaging set and an image plane, wherein the telescope set, the scanning vibration mirror, the first imaging set and the image plane are sequentially arranged from an object space to an image space, the scanning vibration mirror and an optical axis are arranged in an included angle, the scanning vibration mirror is in a fixed state and a movable retrace state, the working wave band of the foldback type medium wave infrared vibration scanning optical system is 3-5 mu m, the focal length is 600mm, and the F number range is set to be 2-5.5. The imaging light beam from the object space is changed into parallel light beam through the telescope group, and enters the first lens group after being turned through the scanning galvanometer, and finally is imaged on the image plane. A main mirror is selected to bear most of the optical power of the system, the scanning galvanometer is designed to realize optical image stabilization through a refraction-reflection structure, and the optical system is in a medium wave gaze tracking mode when the scanning galvanometer is in a fixed state and can be applied to a medium wave area array circumferential scanning mode when the scanning galvanometer is in a retrace state.
Description
Technical Field
The invention relates to the technical field of optical systems, in particular to a foldback type medium wave infrared vibration scanning optical system.
Background
In an airborne photoelectric tracking system, because the working environment of an airborne platform is complex, the imaging quality of a camera is influenced by interference factors such as temperature, parasitic light, vibration, impact and the like besides being limited by optical design.
The medium wave infrared array scanning optical system used in the airborne photoelectric tracking system is difficult to realize large caliber of the transmission type infrared system due to the limitation of infrared materials; the off-axis reflection type system can adopt off-axis three-reflection or four-reflection to realize the design of a large-caliber long-focus optical system, but has the problems of high structural precision, high adjustment difficulty, high processing cost and the like, so that the use condition is limited. The existing area array scanning optical system adopts a transmission type structure and has no characteristics of large caliber and long focal length, so that in practical application, the accuracy of target identification, especially the remote target detection, has a certain limitation.
Disclosure of Invention
The invention mainly aims to provide a foldback type medium wave infrared vibration scanning optical system which has the advantages of large caliber and long focal length, adopts a foldback type structure to realize optical image stabilization, swings at a specific speed, and compensates the change of a azimuth view field in the integral time of an area array detector.
In order to achieve the above purpose, the invention provides a foldback type medium wave infrared external vibration scanning optical system, which comprises a telescope set, a scanning vibration mirror, a first imaging set and an image plane, wherein the telescope set, the scanning vibration mirror, the first imaging set and the image plane are sequentially arranged from an object space to an image space, the scanning vibration mirror and an optical axis form an included angle, the scanning vibration mirror has a fixed state and a movable retrace state, and the telescope set comprises a main mirror and a plurality of lenses;
the working wave band of the foldback type medium wave infrared vibration scanning optical system is 3-5 mu m, the focal length is 600mm, and the F number range is set to be 2-5.5.
Optionally, the included angle between the scanning galvanometer and the optical axis is 45 degrees.
Optionally, the first collimating lens, the second collimating lens, the reflecting mirror, the third collimating lens and the fourth collimating lens behind the main lens are arranged in turn from the object space to the image space, the reflecting mirror is arranged at an included angle with the optical axis and is opposite to the scanning vibrating mirror, and the side surface of the main lens, facing the first collimating lens, is used for receiving light rays.
Optionally, the angle between the reflecting mirror and the optical axis is 45 °.
Optionally, the primary mirror is a meniscus mirror with positive focal power, a concave surface of the primary mirror faces towards the object, the first collimating lens is a meniscus germanium lens with positive focal power, a convex surface of the primary mirror faces towards the object, the second collimating lens is a biconvex germanium lens with negative focal power, the third collimating lens is a meniscus silicon lens with negative focal power, a concave surface of the third collimating lens faces towards the object, and the fourth collimating lens is a meniscus germanium lens with positive focal power, a convex surface of the fourth collimating lens faces towards the object.
Optionally, the main lens adopts a spherical lens, and the first collimating lens, the second collimating lens, the third collimating lens and the fourth collimating lens adopt aspherical lenses.
Optionally, the first imaging group includes a first lens, a second lens, a third lens and a fourth lens sequentially arranged from the object side to the image side;
the first lens is a positive focal power meniscus silicon lens, the convex surface of the first lens faces towards the image space, the second lens is a positive focal power meniscus germanium lens, the concave surface of the second lens faces towards the image space, the third lens is a positive focal power meniscus silicon lens, the convex surface of the third lens faces towards the object space, and the fourth lens is a negative focal power meniscus calcium fluoride lens, and the convex surface of the fourth lens faces towards the image space.
Optionally, the first lens, the second lens and the third lens are aspheric lenses, and the fourth lens is a spherical mirror.
Optionally, the third lens and the fourth lens are disposed next to each other.
Optionally, the direction of light entering the telescope set is the same as the direction of light entering the image plane.
In the technical scheme of the invention, imaging light beams from an object space are changed into parallel light beams sequentially through the telescope group, turned through the scanning galvanometer, enter the first lens group and finally are imaged on an image plane. Considering the conventional mode of matching the main mirror and the secondary mirror, the secondary mirror has larger shielding of the main mirror and has technical difficulty for the design of large caliber, therefore, the invention only selects one main mirror to bear most of the optical power of the system, the design of the scanning vibrating mirror is to realize optical image stabilization through a refraction-reflection structure, the scanning vibrating mirror is positioned in a parallel light path and has two working states, when in a fixed state, the optical system mainly turns the light path, and when in a medium wave gaze tracking mode and a retrace state, the scanning vibrating mirror retraces at a specific speed, and the imaging plane is imaged without defocus, thereby being applicable to a medium wave area array circumferential scanning searching mode.
Drawings
In order to more clearly illustrate the embodiments of the present invention 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 invention, 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 foldback type medium wave infrared vibration scanning optical system provided by the invention;
FIG. 2 is a graph of MTF corresponding to the optical system of FIG. 1 at +20℃;
FIG. 3 is a graph of MTF corresponding to the foldback type medium wave infrared vibration scanning optical system of FIG. 1 at-55 ℃;
fig. 4 is a graph of MTF corresponding to the foldback type medium wave infrared vibration scanning optical system of fig. 1 at +70 ℃.
Reference numerals illustrate:
the achievement of the objects, functional features and advantages of the present invention 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 invention 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 invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the case where a directional instruction is involved in the embodiment of the present invention, 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 invention, 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 invention.
A typical catadioptric system is a casseg Lin Jitong, with the primary mirror being parabolic and the secondary mirror being hyperbolic, which can only correct on-axis spherical aberration. One of the disadvantages is that the sinusoidal condition is not met, the field of view of good image quality is too small, generally not exceeding 2'. The R-C optical imaging system improves the field of view of the cassegrain system, since coma is eliminated, the available field of view is larger than other forms of cassegrain system, and the point columns are symmetrically elliptical. To ensure imaging quality, the maximum field of view obtainable with R-C systems is typically around 20'. To further increase the field of view of the cassegrain system, additional optical elements are introduced to correct aberrations.
The prior art proposes a 'pantagraph telescopic system', but the system needs a large-caliber 4-time aspheric compensation lens, so that the structure is huge, the processing cost is high (Pan Junhua, a novel pantagraph telescopic system, optical precision engineering, 2003, 11 (5): 438-441). Or designing an area array detector continuous scanning imaging optical system, wherein the focal length of the system is 73mm, F/2 and the area array detector is matched with a medium wave refrigerating 320 multiplied by 256 detector (in the ocean, wang Shiyong and the like).
Therefore, the currently reported area array scanning optical systems all adopt a transmission type structure and have the characteristics of large caliber and long focal length, so that in practical application, the accuracy of target identification, especially the detection of a long-distance target, is limited to a certain extent.
In view of this, the present invention provides a folded medium wave infrared vibration scanning optical system, and fig. 1 to 4 are embodiments of the folded medium wave infrared vibration scanning optical system provided by the present invention.
Referring to fig. 1, a foldback type medium wave infrared surface vibration scanning optical system 100 includes a telescope set 1, a scanning galvanometer 2, a first imaging set 3 and an image plane 4 sequentially arranged from an object space to an image space, the scanning galvanometer 2 and an optical axis form an included angle, the scanning galvanometer 2 has a fixed state and a movable retrace state, and the telescope set 1 includes a primary mirror 11 and a plurality of lenses; the working wave band of the foldback type medium wave infrared vibration scanning optical system 100 is 3-5 mu m, the focal length is 600mm, and the F number range is set to be 2-5.5.
In the technical scheme of the invention, imaging light beams from an object space are changed into parallel light beams sequentially through the telescope group 1, turned through the scanning galvanometer 2, enter the first imaging group 3, and finally are imaged on the image plane 4. Considering that the conventional way of matching the main mirror 11 and the secondary mirror, the secondary mirror has larger shielding of the main mirror 11 and has technical difficulty for large-caliber design, therefore, the invention only selects one main mirror 11 to bear most of the optical power of the system, the design of the scanning vibrating mirror 2 is to realize optical image stabilization through a refraction-reflection structure, the scanning vibrating mirror 2 is positioned in a parallel light path, and has two working states, when in a fixed state, the optical system mainly performs turning of the light path, and when in a medium wave gaze tracking mode and in a retrace state, the scanning vibrating mirror 2 performs retrace at a specific speed, and the imaging surface 4 is imaged without defocus, thereby being applicable to a medium wave area array circumferential scanning mode.
The invention is not limited to the angle between the scanning galvanometer 2 and the optical axis, preferably, the angle between the scanning galvanometer 2 and the optical axis is 45 degrees when the scanning galvanometer 2 is in a fixed state, so that the optical path can be turned by 90 degrees, and it is understood that in other embodiments, the angle between the scanning galvanometer 2 and the optical axis can be 30 degrees, 60 degrees, etc., which is not limited by the invention.
Further, the lenses are sequentially disposed from the object side to the image side on the first collimating lens 12, the second collimating lens 13, the reflecting mirror 14, the third collimating lens 15 and the fourth collimating lens 16 behind the main lens 11, the reflecting mirror 14 is disposed at an included angle with the optical axis and is disposed opposite to the scanning galvanometer 2, and the main lens 11 faces to the side surface of the first collimating lens 12 for receiving light. The light is horizontally injected into the main mirror 11, the main mirror 11 has the function of reflecting light, the light is turned to the first collimating lens 12, the light is turned through the plurality of collimating lenses, and the phase difference of the main mirror 11 is corrected. Therefore, the design of large caliber is facilitated. The reflecting mirror 14 is used for turning light, the functional surface for refraction and the functional surface of the scanning vibrating mirror 2 are oppositely arranged, and the two are arranged on the same straight line, so that the volume is reduced, the space size is reduced, and the structure is in a structure type that the reflecting mirror 14 is combined with a lens for one-time imaging, so that the precision is ensured.
Specifically, the light from infinity is reflected by the main mirror 11, then enters the reflecting mirror 14 through the first collimating lens 12 and the second collimating lens 13 at a certain angle, the reflecting mirror 14 deflects the light path at a certain angle, and then sequentially passes through the third collimating lens 15 and the fourth collimating lens 16 to become parallel light, and then enters the scanning galvanometer 2, and it can be understood that the exit pupil position of the lens group should correspond to the position of the scanning galvanometer 2.
The primary lens 11 is selected as the primary power, and the collimating lens group is selected as the secondary power, because the focal length of the optical system is long. Preferably, the main mirror 11 is spherical, low expansion microcrystalline glass is selected as a material, and the collimating mirror groups are made of two optical materials, namely germanium and silicon.
The invention 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 invention.
Further, the main mirror 11 is a positive power meniscus mirror 14 with its concave surface facing the object, the first collimating lens 12 is a positive power meniscus germanium lens with its convex surface facing the object, the second collimating lens 13 is a negative power biconvex germanium lens, the third collimating lens 15 is a negative power meniscus silicon lens with its concave surface facing the object, and the fourth collimating lens 16 is a positive power meniscus germanium lens with its convex surface facing the object.
Further, the main lens 11 is a spherical lens, and the first collimating lens 12, the second collimating lens 13, the third collimating lens 15, and the fourth collimating lens 16 are aspherical lenses.
The first imaging group 3 includes a first lens 31, a second lens 32, a third lens 33, and a fourth lens 34 disposed in this order from the object side to the image side; the first lens 31 is a positive power meniscus silicon lens with its convex surface facing the image side, the second lens 3 is a positive power meniscus germanium lens with its concave surface facing the image side, the third lens 33 is a positive power meniscus silicon lens with its convex surface facing the object side, and the fourth lens 34 is a negative power meniscus calcium fluoride lens with its convex surface facing the image side. 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.
Specifically, the first lens 31, the second lens 32, and the third lens 33 are aspherical lenses, and the fourth lens 34 is a spherical mirror.
In this embodiment, the third lens 33 and the fourth lens 34 are disposed next to each other, so as to ensure light transmission and cooperation.
In this embodiment, the direction of the light beam entering the telescope set 1 is the same as the direction of the light beam entering the image plane 4. For example, the light rays are incident from left to right, reflected to right by the main mirror 11, and finally are still incident on the image surface 4 from left to right after passing through the plurality of lenses and the scanning galvanometer 2.
In order to quickly and effectively design a better optical structure, the invention 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 common aperture telescope group 1 meeting the requirement of flyback compensation without vignetting or light blocking is determined according to the rotation speed of the platform, and the formula is as follows:
ΔωFOV＝ωt
wherein ω is the rotation speed of the platform, and t is the integration time of the optical system area array detector.
The total field of view of the common aperture telescope group 1 is obtained:
ωFOV＝ωmax+ΔωFOV
where ωmax is the field of view required maximum in the optical system.
Step 2: the exit pupil diameter in the telescope set 1, i.e. the size of the corresponding scanning galvanometer 2, is determined according to the entrance pupil diameter of the telescope set 1 and the structural size limitation.
Step 3: according to the multiplying power M=f0 '/fe ' of the common aperture telescope group 1, the focal length F01 ' -F02 ' of the objective lens group and the focal length fe ' of the eyepiece lens group are determined by combining the F number of the system;
step 4: the exit pupil position of the telescope group 1 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 1 and the first imaging group 3 to obtain a medium wave area array scanning optical system;
step 6: the thermal difference elimination design is carried out on the medium 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 medium wave infrared detector at high and low temperatures, so that the temperature range of minus 55 ℃ to plus 70 ℃ is satisfied.
It should be noted that, the optical system adopts a medium wave 640×512 and an F2 refrigeration type infrared detector, so that in order to inhibit stray light outside a field of view from entering the infrared detector, it is necessary to ensure that an aperture diaphragm coincides with a cold diaphragm of the infrared detector.
Compared with the prior art, the technical scheme of the invention has the following advantages:
only the main lens 11 is selected to bear most of the focal power of the system, collimation transmission is arranged between the main focus and the main lens 11 for correction, the aberration is eliminated by utilizing various parameters of the elements, the system structure is optimized, the system processing, detection and adjustment are simplified, and meanwhile, a good imaging result is obtained.
The main mirror 11 in the telescope system is taken as a spherical surface from the angles of technical indexes, optical technology, performance requirements, price and the like, the processing and the adjustment are easy, the cost is greatly reduced compared with that of an aspheric surface, and meanwhile, the reflective surface can realize the characteristics of high reflectivity, no color difference, good heat resistance and light weight of the wave band through film coating.
Since the plurality of collimating lenses are in the converging light path, their size is much smaller than the system aperture. Furthermore, the primary mirror 11 has no chromatic aberration, and therefore the plurality of collimator lenses includes at least two optical materials for achromatic design.
Considering the athermal design of the system, the optimal support material between the two mirrors 14 is indium steel with small thermal expansion coefficient, and the optimal lens barrel material, spacer ring material and support lens barrel material in the transmission assembly are all aluminum, so that a good athermal effect can be achieved.
The thermal difference elimination design is carried out on the medium 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 medium wave infrared detector at high and low temperatures, so that the temperature range of minus 55 ℃ to plus 70 ℃ is satisfied.
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 1 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 rear group system adopts a one-time imaging structure, the exit pupil of the rear group system is overlapped with the cold diaphragm of the detector, the efficiency of the cold diaphragm reaches 100 percent, and the whole medium wave area array scanning system is in a three-time imaging structure.
The exit pupil position of the telescope group 1 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 rear group system;
to reduce the size of the galvanometer, the exit pupil position of the telescope set 1 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 invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (10)
1. The folding medium wave infrared external vibration scanning optical system is characterized by comprising a telescope set, a scanning vibration mirror, a first imaging set and an image plane, wherein the telescope set, the scanning vibration mirror, the first imaging set and the image plane are sequentially arranged from an object space to an image space, the scanning vibration mirror and an optical axis form an included angle, the scanning vibration mirror has a fixed state and a movable retrace state, and the telescope set comprises a main mirror and a plurality of lenses;
the working wave band of the foldback type medium wave infrared vibration scanning optical system is 3-5 mu m, the focal length is 600mm, and the F number range is set to be 2-5.5.
2. The foldback medium wave infrared vibration scanning optical system of claim 1, wherein the scanning galvanometer is at an angle of 45 ° to the optical axis.
3. The foldback medium-wave infrared vibrant scanning optical system according to claim 1, wherein the plurality of lenses are sequentially disposed from an object side to an image side in a first collimating lens, a second collimating lens, a reflecting mirror, a third collimating lens and a fourth collimating lens behind the main lens, the reflecting mirror is disposed at an angle with respect to the optical axis and is disposed opposite to the scanning vibrant mirror, and the main lens faces a side surface of the first collimating lens for receiving light.
4. A foldback medium wave infrared vibration scanning optical system as claimed in claim 3, wherein the angle between the reflecting mirror and the optical axis is 45 °.
5. The foldback medium-wave infrared vibration scanning optical system according to claim 3, wherein the main mirror is a positive power meniscus mirror with its concave surface facing the object, the first collimating lens is a positive power meniscus germanium lens with its convex surface facing the object, the second collimating lens is a negative power biconvex germanium lens, the third collimating lens is a negative power meniscus silicon lens with its concave surface facing the object, and the fourth collimating lens is a positive power meniscus germanium lens with its convex surface facing the object.
6. The foldback medium wave infrared vibration scanning optical system of claim 5, wherein the main mirror is a spherical lens, and the first collimating lens, the second collimating lens, the third collimating lens, and the fourth collimating lens are aspherical lenses.
7. The foldback medium-wave infrared vibro-scanning optical system according to claim 1, wherein the first imaging group includes a first lens, a second lens, a third lens, and a fourth lens disposed in this order from the object side to the image side;
the first lens is a positive focal power meniscus silicon lens, the convex surface of the first lens faces towards the image space, the second lens is a positive focal power meniscus germanium lens, the concave surface of the second lens faces towards the image space, the third lens is a positive focal power meniscus silicon lens, the convex surface of the third lens faces towards the object space, and the fourth lens is a negative focal power meniscus calcium fluoride lens, and the convex surface of the fourth lens faces towards the image space.
8. A foldback medium-wave infrared vibration scanning optical system according to claim 7, wherein the first lens, the second lens, and the third lens are aspherical lenses, and the fourth lens is a spherical mirror.
9. A folded medium wave infrared vibration scanning optical system as set forth in claim 7, wherein said third lens and said fourth lens are disposed in close proximity.
10. The foldback medium wave infrared vibro-scanning optical system of claim 1, wherein the direction of light rays entering the telescope set is the same as the direction of light rays entering the image plane.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310487457.9A CN116449559A (en) | 2023-04-24 | 2023-04-24 | Folding type medium wave infrared vibration scanning optical system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310487457.9A CN116449559A (en) | 2023-04-24 | 2023-04-24 | Folding type medium wave infrared vibration scanning optical system |
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| CN116449559A true CN116449559A (en) | 2023-07-18 |
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| CN202310487457.9A Pending CN116449559A (en) | 2023-04-24 | 2023-04-24 | Folding type medium wave infrared vibration scanning optical system |
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- 2023-04-24 CN CN202310487457.9A patent/CN116449559A/en active Pending
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