CN115793270A - Long-working-distance large-view-field low-temperature vacuum cold chamber collimation optical system - Google Patents
Long-working-distance large-view-field low-temperature vacuum cold chamber collimation optical system Download PDFInfo
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- CN115793270A CN115793270A CN202211511862.1A CN202211511862A CN115793270A CN 115793270 A CN115793270 A CN 115793270A CN 202211511862 A CN202211511862 A CN 202211511862A CN 115793270 A CN115793270 A CN 115793270A
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Abstract
The invention provides a long-working-distance and large-field low-temperature vacuum cold chamber collimating optical system, which belongs to the technical field of optics, wherein a light path part comprises an entrance pupil, an aperture diaphragm, a primary mirror, a secondary mirror, a tertiary mirror and an image surface; the primary mirror and the tertiary mirror are concave aspheric mirrors, and the secondary mirror is a convex aspheric mirror; the image surface comprises a background focal surface, a test focal surface, a target focal surface and an interference focal surface, and the optical axis of the system is an optical axis; the optical axis of the secondary mirror is coincident with the optical axis, the optical axes of the primary mirror and the tertiary mirror have off-axis quantity relative to the optical axis of the system, and the entrance pupil, the primary mirror, the secondary mirror, the tertiary mirror and the image plane are sequentially arranged in the light propagation direction; the primary mirror is an aspheric reflector with positive focal power, the secondary mirror is an aspheric reflector with negative focal power, and the third mirror is an aspheric reflector with positive focal power; the reflecting surfaces of the primary mirror and the secondary mirror are oppositely arranged, the reflecting surfaces of the secondary mirror and the third mirror are oppositely arranged, and the third mirror and the focal plane are oppositely arranged. The invention solves the problems of small view field and short working distance in the prior art.
Description
Technical Field
The invention belongs to the technical field of optics, and particularly relates to a low-temperature vacuum cold chamber collimation optical system with a long working distance and a large view field.
Background
The infrared system outside the atmosphere needs to be examined and evaluated on the ground to detect and identify the remote target in the space environment, and an optical system needs to be constructed in the ground vacuum and low-temperature simulated space environment.
The conventional collimator has small field of view (less than or equal to 0.5 degrees), small relative aperture, long focal length, small size, large energy loss of a refraction system and chromatic aberration, so that the requirement can be met by adopting a reflection type optical system.
Among the various configurations of the reflective system, cassegrain, double parabolic, catadioptric or off-axis parabolic configurations may be used. Due to the fact that the system is large in caliber and small in relative aperture, the cassegrain type adopted can block, energy loss is large, a double-throw type mechanism is complex, the refraction and reflection type has chromatic aberration, and therefore the off-axis paraboloid structure system can meet requirements.
For a large-field infrared system and a long-working-distance test optical system with a collimator imaging field of view more than or equal to 2 degrees, which are required, common collimator forms (Cassegrain, double-throw, catadioptric or off-axis paraboloid) cannot be realized, the requirements of long-entrance pupil distance matching or testing working distance cannot be met, and the prior art cannot be used for testing in a room-temperature and vacuum low-temperature simulated space environment and needs to be improved.
Disclosure of Invention
The invention provides a long-working-distance and large-view-field low-temperature vacuum cold chamber collimation optical system, which is used for testing a large-view-field infrared system and a complex scene and aims to solve the problems that the existing optical system is small in view field, short in working distance and incapable of being tested and used in a room-temperature and vacuum low-temperature simulated space environment.
The purpose of the invention is realized by the following technical scheme:
a long-working-distance and large-field low-temperature vacuum cold chamber collimating optical system adopts an off-axis three-reflection type system structure with a front-located entrance pupil, and a light path part of the collimating optical system comprises an entrance pupil, an aperture diaphragm, a primary mirror, a secondary mirror, a third mirror and an image surface; the primary mirror and the tertiary mirror are concave aspheric mirrors, and the secondary mirror is a convex aspheric mirror; the image plane comprises a background focal plane, a test focal plane, a target focal plane and an interference focal plane, and the optical axis of the system is an optical axis; the optical axis of the secondary mirror is coincident with the optical axis, the optical axes of the primary mirror and the tertiary mirror have off-axis quantity relative to the optical axis of the system, and the entrance pupil, the aperture diaphragm, the primary mirror, the secondary mirror, the tertiary mirror and the image plane are sequentially arranged in the light propagation direction; the primary mirror is an aspheric reflector with positive focal power, the secondary mirror is an aspheric reflector with negative focal power, and the third mirror is an aspheric reflector with positive focal power; the reflecting surfaces of the primary mirror and the secondary mirror are oppositely arranged, the reflecting surfaces of the secondary mirror and the third mirror are oppositely arranged, and the third mirror and the focal plane are oppositely arranged.
For further optimization, the distance between the primary mirror and the secondary mirror is 0.35 to 0.5 times of the system focal length, the distance between the secondary mirror and the third mirror is 0.35 to 0.5 times of the system focal length, and the distance between the third mirror and the focal plane along the z-axis direction is 1.00 to 1.30 times of the distance between the primary mirror and the secondary mirror.
As further optimization, the supporting part of the low-temperature vacuum cold cabin collimation optical system comprises a primary mirror assembly, a secondary mirror assembly, a tertiary mirror assembly, a primary tertiary mirror support, a secondary mirror support and a mounting seat; the primary mirror is arranged on the primary mirror assembly, the secondary mirror is arranged on the secondary mirror assembly, and the tertiary mirror is arranged on the tertiary mirror assembly.
As further optimization, the primary mirror assembly, the secondary mirror assembly and the tertiary mirror assembly are supported by three points on the back, and the secondary mirror and the tertiary mirror are supported by the center of the back.
As further optimization, the primary mirror, the secondary mirror and the tertiary mirror are all processed by SIC, taper sleeves are bonded at supporting parts, titanium alloy flexible sections are installed in the taper sleeves, and the back plate and the supports are also processed by SIC materials.
As further optimization, the primary mirror assembly, the secondary mirror assembly and the tertiary mirror assembly are directly prepared into a structure with a back single point and are connected with the support structure through the single-point structure; the primary mirror assembly and the three-mirror assembly share one primary three-mirror support, and the secondary mirror assembly independently uses one secondary mirror support; the main three-mirror support and the secondary mirror support are both fixed on a mounting seat, and the mounting seat is also made of SIC.
And as further optimization, gaskets made of SIC materials are arranged between the primary mirror assembly and the tertiary mirror assembly and between the primary mirror support and the secondary mirror support.
As a further optimization, the low-temperature vacuum cold chamber collimation optical system further comprises a Dewar refrigeration structure, the Dewar refrigeration structure comprises a main mirror Du Wazhao, a secondary mirror Du Wazhao and a three mirror Du Wazhao which are independent, the main mirror Du Wazhao, the secondary mirror Du Wazhao and the three mirror Du Wazhao are connected through screws to form a complete collimation optical system Du Wazhao, and the bottom of the collimation optical system Du Wazhao is in heat insulation connection with the mounting platform.
For further optimization, the collimating optical system Du Wazhao wraps the collimating optical system of the low-temperature vacuum cold chamber, light transmitting holes are formed in the front of the reflecting mirror surfaces of the primary mirror assembly, the secondary mirror assembly and the three-mirror assembly, and mounting holes are formed in pin holes of the mounting base; a distance of 20-30 mm is arranged between the collimating optical system Du Wazhao and the reflector body of the low-temperature vacuum cold chamber collimating optical system; the back parts of the primary mirror, the secondary mirror and the tertiary mirror are connected with the Dewar cover through heat conduction locks; the mounting seat is installed in contact with the platform through three-point connection, and a multilayer heat insulation structure is further arranged between the mounting seat and the platform.
As further optimization, the multilayer heat insulation structure between the mounting seat and the platform comprises more than two layers of heat insulation pads, spherical supports, spring pressing sheets and connecting bolts, the heat insulation pads are stacked in series, only connecting parts of adjacent heat insulation pads are in contact, the rest parts of the heat insulation pads are isolated in a hollow mode, the heat insulation pads are fixedly connected through the spring pressing sheets and the connecting bolts, the spherical supports are fixed on the heat insulation pads on the outermost side through the spring pressing sheets and the connecting bolts, and the spherical supports are in point contact with the base.
The beneficial technical effects obtained by the invention are as follows:
compared with the prior art, the target detection, identification and tracking performance test of the 2-degree view field infrared system full-view field coverage under the simulated space environment is realized, the advantage of long working distance is achieved, and the problem of structural interference among the ground test system devices is better solved. The problems of small view field and short working distance in the prior art are solved, and the device is suitable for being used in a vacuum low-temperature environment and has outstanding substantive characteristics and remarkable progress.
Drawings
FIG. 1 is a light path diagram of an off-axis TMA optical test system of the present invention;
FIG. 2 is a light path diagram of the background optical system of the present invention;
FIG. 3 is an optical path diagram of a target optical system of the present invention;
FIG. 4 is a schematic diagram of the composition of a support structure according to one embodiment of the present invention;
FIG. 5 is a schematic diagram of the position relationship of a Dewar and a thermal isolation structure according to one embodiment of the present invention;
FIG. 6 is an exploded view of a thermal isolation structure according to one embodiment of the present invention;
reference numerals: 1. an entrance pupil and an aperture stop; 2. a primary mirror; 3. a secondary mirror; 4. three mirrors; 5. an image plane; 6. an optical axis; 10. secondary mirror Du Wazhao; 20. a mounting seat; 21. a main three-mirror support; 22. supporting the secondary mirror; 30. a thermally insulating structure; 31. a second layer of insulation mat; 32. a first layer of insulation mat; 33. spherical support; 34. a first spring presser; 35. a first hexagon socket head cap screw; 36. a second spring presser; 37. a second hexagon socket screw; 38. a third layer of insulation mat; 211. a primary mirror assembly; 221. a secondary mirror assembly; 212. a three-mirror assembly; 501. a background focal plane and a test focal plane; 502. a target focal plane; 503. disturbing the focal plane.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the drawings and the detailed description. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the invention without making creative efforts, shall fall within the scope of the claimed invention.
As shown in figures 1-3, a long-working-distance large-visual-field low-temperature vacuum cold chamber collimation optical system adopts an off-axis three-mirror optical structure in the technical route. In terms of structural size, the off-axis three-mirror Rug-TMA system (after secondary mirror of the intermediate image plane) is small, and the intermediate image plane is arranged, so that stray light control is facilitated. Therefore, an off-axis three-mirror Rug-TMA system is selected for optimization.
In the embodiment, an off-axis three-reflection type system structure with a front entrance pupil is adopted, and the light of the remote object sequentially passes through the entrance pupil and the three reflectors and then is imaged on an image surface to obtain an image of the remote object. The collimating optical system comprises three parts of optical paths, namely a target simulation collimating optical path, an interference simulation collimating optical path and a background simulation and test optical path. The three optical paths share the off-axis TMA main optical system. The low-temperature vacuum cold cabin collimation optical system is integrally fixed on a mounting platform of the whole infrared system.
The light path part of the collimating optical system in this embodiment includes an entrance pupil and aperture diaphragm 1, a primary mirror 2, a secondary mirror 3, a tertiary mirror 4, and an image plane 5. Wherein the primary mirror 2 and the tertiary mirror 4 are concave aspherical mirrors, and the secondary mirror 3 is a convex aspherical mirror. The image plane 5 includes a background focal plane and a test focal plane 501, a target focal plane 502 and an interference focal plane 503. The optical axis of the system in this particular embodiment is optical axis 6.
In this embodiment, the optical systems are sequentially arranged according to a right-hand spatial coordinate system (x, y, z) designed for the optical path, the z-axis direction is the optical axis direction, the yz-coordinate plane is the meridian plane of the optical system, the xz-coordinate plane is the sagittal plane of the optical system, and the yz-coordinate plane and the xz-coordinate plane are perpendicular to each other and perpendicular to the z-axis (optical axis). In the three reflectors of the system, the optical axis of the secondary mirror 3 coincides with the optical axis 6 of the whole system, the optical axes of the primary mirror 2 and the tertiary mirror 4 have smaller off-axis amount relative to the optical axis 6 of the system, and an entrance pupil and aperture diaphragm 1, the primary mirror 2, the secondary mirror 3, the tertiary mirror 4 and an image surface 5 are sequentially arranged in the light propagation direction.
In this embodiment, the primary mirror 2 is an aspheric mirror with positive focal power, the secondary mirror 3 is an aspheric mirror with negative focal power, and the third mirror 4 is an aspheric mirror with positive focal power.
The reflecting surfaces of the primary mirror 2 and the secondary mirror 3 are oppositely arranged, the reflecting surfaces of the secondary mirror 3 and the third mirror 4 are oppositely arranged, and the third mirror 4 and the focal plane 5 are oppositely arranged; the distance between the primary mirror 2 and the secondary mirror 3 and the distance between the secondary mirror 3 and the third mirror 4 are very close and are between 0.35 and 0.5 times of the system focal length, and the distance between the third mirror 4 and the focal plane 5 along the z-axis direction is about 1.00 to 1.30 times of the distance between the primary mirror 2 and the secondary mirror 3.
In this embodiment, parameters of the background simulation and test optical path optical system are shown in table 1, relationships between effective sizes and positions of the respective mirrors of the corresponding background simulation and test optical path optical system are shown in table 2, parameters of the target simulation collimation optical path optical system are shown in table 3, and relationships between effective sizes and positions of the respective mirrors of the target simulation collimation optical path optical system are shown in table 4.
By adopting the optical system of the embodiment with the front entrance pupil, the field of view can reach more than 2 degrees, the problem that the field of view of the optical system is not more than 0.5 degrees and cannot be used for large-field-of-view testing in the prior art is solved, and the system has relatively small volume, good imaging quality and simple structure.
TABLE 1 background simulation and test of parameters of optical path optical systems
TABLE 2 background simulation and test of the relationship between the effective size and position of each mirror of the optical system
The optical structure of the optical system of the target simulated collimated light path is shown in fig. 3. The parameters of the target simulated collimated light path optical system are shown in table 3.
TABLE 3 parameters of the optical system for simulating the collimation light path
TABLE 4 relationship between effective size and position of each mirror surface of target simulation collimation light path optical system
As shown in fig. 4, the support portion of the collimation optical system of the low-temperature vacuum cold chamber in the present embodiment includes a primary mirror assembly 211, a secondary mirror assembly 221, a tertiary mirror assembly 212, a primary tertiary mirror support 21, a secondary mirror support 22, and a mounting base 20.
In the embodiment, the calibers of the secondary mirror 3 and the tertiary mirror 4 are phi 120mm and phi 240 respectively, and a back center supporting mode is adopted. The primary mirror 2, the secondary mirror 3 and the third mirror 4 are all formed by SIC processing, taper sleeves are bonded at supporting positions, and titanium alloy flexible joints are arranged in the taper sleeves. In order to reduce the influence of temperature deformation on the mirror surface shape, the back plate and the support are made of SIC materials, and the matching consistency of the materials is improved.
In this embodiment, the off-axis TMA optical test system is applied to a vacuum environment with a temperature of-150K to 300K, and no personnel participates in the debugging. In the design, a heat dissipation design or a non-heat design must be adopted, the problem that a test system is equivalent to the change of a test standard due to the temperature change is solved, and therefore, the full SIC material is considered to be selected.
The SIC reflector adopts a back single-point supporting mode, and aims to eliminate the surface type reduction caused by temperature change due to multi-point supporting and peripheral supporting.
In this embodiment, the primary mirror assembly 211, the secondary mirror assembly 221, and the tertiary mirror assembly 212 are directly fabricated with a back single-point structure and connected to the support structure SIC via the single-point structure. The primary mirror assembly 211 and the tertiary mirror assembly 212 share a primary tertiary mirror support 21, and the secondary mirror assembly 221 employs a secondary mirror support 22 alone. The main three-mirror support 21 and the secondary mirror support 22 are both fixed on a T-shaped mounting seat 20, and the T-shaped mounting seat 20 is also made of SIC. Forming the whole SIC structure.
In this embodiment, spacers made of SIC material are disposed between the primary mirror assembly 211 and the tertiary mirror assembly 212 and the primary tertiary mirror support 21, and between the secondary mirror assembly 221 and the secondary mirror support 22, respectively, for adjusting the position and angle of the mirror during the installation and adjustment process. The main properties of the SIC mirror construction material are given in table 5.
TABLE 5SIC mirror body structure material attribute table
The properties of the connecting support material at each location in this embodiment are shown in Table 6.
TABLE 6 Joint support Material Properties
| Main mirror | Secondary mirror | Three mirrors | |
| Mirror support | SIC | SIC | SIC |
| Multilayer heat insulation structure | Glass fiber reinforced plastic + TC4 | Glass fiber reinforced plastic + TC4 | Glass fiber reinforced plastic + TC4 |
| Contact structure | TC4 | TC4 | TC4 |
The working temperature of the low-temperature vacuum cold chamber collimation optical system is 110K, dewar refrigeration is required, the Dewar refrigeration structure in the specific embodiment comprises three independent parts, namely a main mirror Du Wazhao, a secondary mirror Du Wazhao and a three mirror Du Wazhao, the three parts are connected through screws to form a complete collimation optical system Du Wazhao, and the bottom of the collimation optical system Du Wazhao is in heat insulation connection with the mounting platform.
The collimating optical system Du Wazhao covers the low-temperature vacuum cold chamber collimating optical system, light transmission holes are arranged only in front of the reflecting mirror surfaces of the primary mirror assembly 211, the secondary mirror assembly 221 and the three-mirror assembly 212, and mounting holes are arranged at pin holes of the mounting base 20. The distance between the collimating optical system Du Wazhao and the reflector body of the low-temperature vacuum cold chamber collimating optical system is 20-30 mm. The back parts of the primary mirror 2, the secondary mirror 3 and the tertiary mirror 4 are connected with the Dewar cover through heat conduction locks, so that radiation and heat conduction of the collimating mirror group are realized, and the collimating optical system is ensured to be cooled quickly.
The mount pad 20 is installed through three point connection and platform contact, still is provided with the thermal-insulated structure of multilayer between mount pad 20 and the platform, and the purpose further guarantees whole connection structure's thermal stability and homogeneity.
Taking the secondary mirror portion as an example, in the present embodiment, the dewar refrigeration structure of the secondary mirror portion is shown in fig. 5, the secondary mirror Du Wazhao wraps the secondary mirror assembly 221, the light-transmitting hole is only arranged in front of the mirror surface of the secondary mirror 3, and the bottom of the secondary mirror Du Wazhao is connected to the mounting platform in a heat insulation manner through the thermal isolation assembly 30.
As shown in fig. 6, the thermal insulation assembly 30 includes a second layer of insulation pad 31, a first layer of insulation pad 32, a ball support 33, a first spring plate 34, a first socket head cap 35, a second spring plate 36, a second socket head cap 37, and a third layer of insulation pad 38. The third layer of insulation blanket 38, the second layer of insulation blanket 31 and the first layer of insulation blanket 32 are connected together by a second hexagon socket head cap screw 37 and a second spring plate 36 in sequence. The ball supports 33 are fixed to the first layer of insulation blanket 32 by first hexagon socket head cap screws 35 and first spring tabs 34.
The spherical supports 33 are in point contact with the base to minimize the contact area and reduce the heat transfer from the base to the spherical supports. The combination of the third layer of insulation mat 38, the second layer of insulation mat 31 and the first layer of insulation mat 32, which are made of multiple layers of different materials and have low thermal conductivity, increases the contact surface and the thermal conduction distance on the link, and reduces the thermal conduction between the spherical support 33 and the optical-mechanical structure. And each single-layer heat insulation pad is only in small-area contact with the inner hexagon bolt connecting part, so that the heat conduction among the single-layer heat insulation pads is reduced. The thermal shield is made of a material with good thermal insulation and high reflectivity and is mounted outside the thermal isolation assembly 30 and the secondary mirror assembly 221. The secondary mirror Du Wazhao is used as a heat insulation cover, the heat insulation film is wrapped outside the secondary mirror Du Wazhao, reflectivity of electromagnetic waves is increased through the heat insulation film and the heat insulation cover, absorption rate is reduced, and influences of heat radiation on an optical machine structure and an optical system are reduced.
The beneficial technical effects obtained by the specific embodiment are as follows:
the optical system has a front entrance pupil, a field of view of more than 2 degrees, a relatively small system volume, good imaging quality and a simple structure. The method is mainly applied to a simulation or test system, solves the requirement of matching the long entrance pupil distance or testing the working distance, and can realize the simulation test of the large-field simulation scene.
Compared with the prior art, the target detection, identification and tracking performance test of the 2-degree view field infrared system full-view field coverage under the simulated space environment is realized, the advantage of long working distance is achieved, and the problem of structural interference among the ground test system devices is better solved. The problems of small view field and short working distance in the prior art are solved, and the device is suitable for being used in a vacuum low-temperature environment and has outstanding substantive characteristics and remarkable progress.
Claims (10)
1. A long-working-distance large-field low-temperature vacuum cold chamber collimation optical system is characterized in that an off-axis three-reflection type system structure with a front entrance pupil is adopted, and a light path part of the collimation optical system comprises an entrance pupil and aperture diaphragm (1), a primary mirror (2), a secondary mirror (3), a tertiary mirror (4) and an image surface (5);
the primary mirror (2) and the tertiary mirror (4) are concave aspheric mirrors, and the secondary mirror (3) is a convex aspheric mirror; the image plane (5) comprises a background focal plane, a test focal plane (501), a target focal plane (502) and an interference focal plane (503), and the optical axis of the system is an optical axis (6);
the optical axis of the secondary mirror (3) is coincident with the optical axis (6), the optical axes of the primary mirror (2) and the tertiary mirror (4) have an off-axis amount relative to the optical axis (6) of the system, and the entrance pupil and aperture diaphragm (1), the primary mirror (2), the secondary mirror (3), the tertiary mirror (4) and the image plane (5) are sequentially arranged in the light propagation direction;
the primary mirror (2) is an aspheric reflector with positive focal power, the secondary mirror (3) is an aspheric reflector with negative focal power, and the three mirrors (4) are aspheric reflectors with positive focal power; the reflecting surfaces of the primary mirror (2) and the secondary mirror (3) are oppositely arranged, the reflecting surfaces of the secondary mirror (3) and the third mirror (4) are oppositely arranged, and the third mirror (4) and the focal plane (5) are oppositely arranged.
2. The cryogenic vacuum cold chamber collimating optical system of claim 1, wherein: the distance between the primary mirror (2) and the secondary mirror (3) is 0.35-0.5 times of the system focal length, the distance between the secondary mirror (3) and the three mirrors (4) is 0.35-0.5 times of the system focal length, and the distance between the three mirrors (4) and the focal plane (5) along the z-axis direction is 1.00-1.30 times of the distance between the primary mirror (2) and the secondary mirror (3).
3. The cryogenic vacuum cold chamber collimating optical system of claim 2, wherein: the support part of the low-temperature vacuum cold cabin collimation optical system comprises a primary mirror assembly (211), a secondary mirror assembly (221), a three-mirror assembly (212), a primary three-mirror support (21), a secondary mirror support (22) and a mounting seat (20); the primary mirror (2) is arranged on the primary mirror assembly (211), the secondary mirror (3) is arranged on the secondary mirror assembly (221), and the tertiary mirror (4) is arranged on the tertiary mirror assembly (212).
4. The cryogenic vacuum cold chamber collimating optical system of claim 3, wherein: the primary mirror assembly (211), the secondary mirror assembly (221) and the tertiary mirror assembly (212) are supported by three points on the back, and the secondary mirror (3) and the tertiary mirror (4) are supported by the center of the back.
5. The cryogenic vacuum cold chamber collimating optical system of claim 4, wherein: the primary mirror (2), the secondary mirror (3) and the tertiary mirror (4) are all formed by SIC processing, a taper sleeve is bonded at the supporting part, the titanium alloy flexible joint is installed in the taper sleeve, and the back plate and the support are also formed by SIC materials.
6. The cryogenic vacuum cold chamber collimating optical system of claim 5, wherein: the primary mirror assembly (211), the secondary mirror assembly (221) and the tertiary mirror assembly (212) are directly prepared into a structure with a back single point and are connected with the supporting structure through the single point structure; the primary mirror assembly (211) and the tertiary mirror assembly (212) share one primary tertiary mirror support (21), and the secondary mirror assembly (221) independently uses one secondary mirror support (22); the main three-mirror support (21) and the secondary mirror support (22) are both fixed on the mounting seat (20), and the mounting seat (20) is also made of SIC.
7. The collimating optical system of a low-temperature vacuum cold chamber according to any one of claims 3 to 6, wherein: gaskets made of SIC materials are arranged between the primary mirror assembly (211) and the tertiary mirror assembly (212) and the primary tertiary mirror support (21), and between the secondary mirror assembly (221) and the secondary mirror support (22).
8. The cryogenic vacuum cold chamber collimating optical system of claim 7, wherein: the low-temperature vacuum cold chamber collimation optical system further comprises a Dewar refrigeration structure, the Dewar refrigeration structure comprises a main mirror Du Wazhao, a secondary mirror Du Wazhao and a three mirror Du Wazhao which are independent, the main mirror Du Wazhao, the secondary mirror Du Wazhao and the three mirror Du Wazhao are connected through screws to form a complete collimation optical system Du Wazhao, and the bottom of the collimation optical system Du Wazhao is in heat insulation connection with the mounting platform.
9. The cryogenic vacuum cold chamber collimating optical system of claim 8, wherein: the collimating optical system Du Wazhao wraps the low-temperature vacuum cold chamber collimating optical system, light transmitting holes are formed in the front of the reflecting mirror surfaces of the primary mirror assembly (211), the secondary mirror assembly (221) and the tertiary mirror assembly (212), and mounting holes are formed in pin holes of the mounting base (20); a distance of 20-30 mm is arranged between the collimating optical system Du Wazhao and the reflector body of the low-temperature vacuum cold chamber collimating optical system; the backs of the primary mirror (2), the secondary mirror (3) and the tertiary mirror (4) are connected with the Dewar cover through a heat conduction lock; the mounting seat (20) is installed in contact with the platform through three-point connection, and a multilayer heat insulation structure is further arranged between the mounting seat (20) and the platform.
10. The cryogenic vacuum cold chamber collimating optical system of claim 9, wherein: the multilayer heat insulation structure between the mounting seat (20) and the platform comprises more than two layers of heat insulation pads, spherical supports, spring pressing sheets and connecting bolts, the heat insulation pads are stacked in series, only connecting parts of adjacent heat insulation pads are in contact, the rest parts of the adjacent heat insulation pads are isolated in a hollow mode, the heat insulation pads are fixedly connected through the spring pressing sheets and the connecting bolts, the spherical supports are fixed on the heat insulation pads on the outermost side through the spring pressing sheets and the connecting bolts, and the spherical supports are in point contact with the base.
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| CN202211511862.1A CN115793270A (en) | 2022-11-29 | 2022-11-29 | Long-working-distance large-view-field low-temperature vacuum cold chamber collimation optical system |
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| CN202211511862.1A CN115793270A (en) | 2022-11-29 | 2022-11-29 | Long-working-distance large-view-field low-temperature vacuum cold chamber collimation optical system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117170078A (en) * | 2023-11-02 | 2023-12-05 | 中国科学院长春光学精密机械与物理研究所 | Reflection type zoom afocal optical system |
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2022
- 2022-11-29 CN CN202211511862.1A patent/CN115793270A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117170078A (en) * | 2023-11-02 | 2023-12-05 | 中国科学院长春光学精密机械与物理研究所 | Reflection type zoom afocal optical system |
| CN117170078B (en) * | 2023-11-02 | 2024-01-12 | 中国科学院长春光学精密机械与物理研究所 | Reflection type zoom afocal optical system |
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