CN113238337A - Off-axis three-reflection surveying and mapping camera supporting frame structure - Google Patents
Off-axis three-reflection surveying and mapping camera supporting frame structure Download PDFInfo
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- CN113238337A CN113238337A CN202110432105.4A CN202110432105A CN113238337A CN 113238337 A CN113238337 A CN 113238337A CN 202110432105 A CN202110432105 A CN 202110432105A CN 113238337 A CN113238337 A CN 113238337A
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- main frame
- mounting plate
- frame
- middle section
- stray light
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- 238000013507 mapping Methods 0.000 title claims abstract description 15
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 29
- 239000002131 composite material Substances 0.000 claims abstract description 9
- 239000007769 metal material Substances 0.000 claims abstract description 5
- 238000009434 installation Methods 0.000 claims abstract description 4
- 230000000694 effects Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 3
- 239000004917 carbon fiber Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 3
- 238000009958 sewing Methods 0.000 claims description 3
- 238000005245 sintering Methods 0.000 claims description 3
- 230000003071 parasitic effect Effects 0.000 abstract 1
- 230000003287 optical effect Effects 0.000 description 9
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 7
- 229910010271 silicon carbide Inorganic materials 0.000 description 7
- 230000008901 benefit Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 3
- 230000011514 reflex Effects 0.000 description 3
- 238000004026 adhesive bonding Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 238000003384 imaging method Methods 0.000 description 1
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- 239000013585 weight reducing agent Substances 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
- G02B7/182—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
- G02B7/181—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lens Barrels (AREA)
Abstract
The invention relates to an off-axis three-mirror surveying and mapping camera supporting structure, which comprises a main frame, a reflector mounting plate, a focal plane mounting plate and an embedding sleeve; the main frame is integrally formed by SiC/C composite materials so as to provide integral rigidity of the whole structure and comprises a front frame, a middle section and a rear frame; the front frame and the rear frame are provided with a reflector opening and a focal plane opening; the middle section is of a skin reinforced structure, and the reinforcing ribs play a role in reinforcing the flexural rigidity of the skin on one hand and play a role in eliminating parasitic light on the other hand; an inclined plane is arranged on the middle section and is used as an installation flange of the light shield; the reflector mounting plate and the focal plane mounting plate are made of metal materials and are mounted on the main frame through the embedding sleeve and the fastening piece.
Description
Technical Field
The invention relates to an off-axis three-mirror surveying and mapping camera supporting frame structure which is suitable for the technical field of space optical remote sensing.
Background
With the continuous improvement of the application requirements of the ground data of the space remote sensing image, the requirements of large caliber, long focal length, high resolution and high stability are provided for the space camera.
The off-axis three-reflection optical system has the characteristics of no central blocking, large field of view, no chromatic aberration, suitability for wide-spectrum range imaging, more system optimization variables and the like, and is widely applied to the field of space remote sensing.
A surveying and mapping camera for space photogrammetry puts forward a very high requirement on the stability of the internal and external orientation elements of the camera, and correspondingly improves the requirement on the mechanical and thermal stability of a camera supporting structure. The surveying and mapping cameras at home and abroad are provided with a refraction type optical system, such as an HRS (high resolution scanning system) camera of a SPOT-5 satellite in France, a three-linear-array camera of a first-sky-drawing satellite in China and a three-linear-array camera of a third-resource satellite in China, and a reflection type optical system, such as an OSA (open air systems) coaxial three-lens reflex camera of an IKONOS satellite in America, an off-axis three-lens reflex camera of a CartoSat-1 satellite in India, and a PRISM-2 off-axis four-lens reflex camera of an ALOS-3 satellite in Japan. The most obvious advantages of the off-axis three-mirror system compared with the on-axis three-mirror system are that the field angle is larger, the central obstruction is avoided, and the diffraction MTF under the same F number condition is higher.
The main supporting structure of the off-axis reflective optical system is generally in an integral frame type or a truss type. In the surveying and mapping camera, the camera of CartoSat-1 adopts an integral frame type structure; the PRISM-2 camera of the ALOS-3 satellite is in a truss structure. Jipeng et al, CN201510756514.4, the truss-type main support structure of the small and medium-sized off-axis three-mirror space camera is in the form of three layers of base plates + two groups of trusses; zhanglei et al, CN201710058629.5, Long-focus wide-field large off-axis three-lens space camera truss type main support structure is in a form of two end frames and a middle truss. The integral frame type structure has the advantages of compact structure, good mechanical property, no assembly stress inside the frame, easy satisfaction of requirements such as lens spacing and the like, contribution to camera assembly and debugging tests, and large integral frame forming difficulty. The truss structure has the advantage of high degree of lightweight, but the structural assembly requirements are high, with somewhat poor stiffness and thermal stability.
Disclosure of Invention
The technical problem solved by the invention is as follows: the defects of the prior art are overcome, and the off-axis three-mirror surveying and mapping camera supporting frame structure is provided.
The technical scheme of the invention is as follows: the off-axis three-mirror surveying and mapping camera supporting structure comprises a main frame, a reflector mounting plate, a focal plane mounting plate and an embedding sleeve; the main frame is integrally formed by SiC/C composite materials so as to provide integral rigidity of the whole structure and comprises a front frame, a middle section and a rear frame; the front frame and the rear frame are provided with a reflector opening and a focal plane opening, and the middle section is of a skin reinforced structure; an inclined plane is arranged on the middle section and is used as an installation flange of the light shield; the reflector mounting plate and the focal plane mounting plate are made of metal materials and are mounted on the main frame through the embedding sleeve and the fastening piece.
The reinforcing ribs in the middle section skin play a role in reinforcing the flexural rigidity of the skin on one hand, and on the other hand, the appearance, the height and the spacing of the reinforcing ribs are designed according to the stray light analysis result to shield primary and secondary reflection stray light and play a role in eliminating stray light.
Preferably, the middle section skin internal reinforcing rib is designed in the following mode:
determining the height of the appearance of the reinforcing rib according to the light path enveloping appearance and the size in the main frame, and reserving a gap of 10-20 mm between the reinforcing rib and the light;
determining the distance between the reinforcing ribs according to the stray light analysis result so as to shield primary stray light and multiple times of reflected stray light;
and (4) analyzing the structural rigidity, if the structural rigidity is not satisfied, additionally adding an auxiliary reinforcing rib, and avoiding the influence on the stray light eliminating effect due to the height of the auxiliary reinforcing rib.
Preferably, the front frame and the rear frame are closed towards the outer side panel, and the inner side panel is provided with an opening.
Preferably, the main frame is provided with mounting points of the components on the off-axis three-mirror surveying and mapping camera, and the higher the boss height on the surfaces of the mounting points, the higher the corresponding form and position tolerance requirement.
Preferably, the bushing is cylindrical with a flange, an internal thread is arranged from the flange end to the cylinder, and the internal thread is a blind hole; the cylinder is provided with external threads.
Preferably, the bushing is screwed out from the inner side of the main frame or screwed in from the outer side, the external threads of the bushing and the lower surface of the flange are coated with structural adhesive, and the mounting plate main frame is fixedly connected at the flange part through a fastener.
Preferably, the carbon fiber preform of the main frame is formed by adopting a three-dimensional sewing and needling process, and then the whole body is subjected to reaction sintering, so that the manufactured main frame is a SiC/C composite material integrally-formed product.
Compared with the prior art, the invention has the beneficial effects that:
1) the invention provides the off-axis three-mirror survey and drawing camera supporting structure with high rigidity and high stability by utilizing the characteristics of high specific stiffness and low expansion coefficient of the SiC/C composite material, and the off-axis three-mirror survey and drawing camera supporting structure has the advantages of high rigidity, light weight and good stability.
2) The carbon fiber and the silicon carbide are integrally formed, the structure is compact, no assembly stress exists in the frame, the lens space of the optical part is favorably ensured, and the camera assembly and debugging test is also favorably realized.
3) The off-axis three-mirror survey camera support mechanism is light in weight, the density of the SiC/C composite material is only about 1/2 that of titanium alloy, and the weight reduction effect is obvious.
4) The off-axis three-mirror surveying and mapping camera support mechanism is high in rigidity, stable in spatial position of a supported optical system under the gravity condition in the ground assembly and adjustment test process, and good in mechanical resistance.
5) The off-axis three-mirror surveying and mapping camera supporting mechanism is excellent in thermal stability, and the spatial position of a supported optical system is guaranteed to be stable under the environment conditions of ground and rail temperature.
Drawings
FIGS. 1-3 are schematic views of the structure of the present invention from different angles;
FIG. 4 is a schematic view of a main frame bushing connection according to the present invention;
FIG. 5 is a second schematic view of the main frame insert connection of the present invention;
FIG. 6 is a schematic view of the insert of the present invention.
Detailed Description
The invention is further illustrated by the following examples.
Fig. 1-3 are schematic diagrams of the supporting structure of the off-axis triple-mirror surveying camera according to the present invention. As shown, the off-axis triple-mirror surveying camera support structure includes: the device comprises a main frame 1, a reflector mounting plate 2, a focal plane mounting plate 3, an insert sleeve 4 and a fastener 5 (a screw, a washer and a nut); wherein,
the main frame 1 is integrally formed by SiC/C composite materials so as to provide integral rigidity of the whole structure; the reflector mounting plate 2 and the focal plane mounting plate 3 are made of metal materials, are fixedly connected with the main frame through gluing and screwing and provide mounting planes for the reflector component and the focal plane component; the insert sleeve 4 is made of metal materials with different specifications, is fixed with the main frame through gluing and screwing and provides mounting points for each reverse side mirror assembly, focal plane assembly, other parts and the like; the fastener 5 is used for fixing the reflector mounting plate, the focal plane mounting plate and the main frame, and the bushing and the main frame.
The main frame 1 is a box-shaped structure and is divided into a front frame 6, a middle section 7 and a rear frame 8. The front frame 6 and the rear frame 8 are in an I-beam form, the outer side panel is closed, and the inner side panel is provided with holes, so that the forming is convenient; the middle section 7 is of a skin reinforced structure, the reinforcing ribs 9 play a role in reinforcing the flexural rigidity of the skin on one hand, and the appearance, the height and the distance of the reinforcing ribs are designed according to the stray light analysis result on the other hand, so that primary and secondary reflected stray light is shielded, and the stray light eliminating effect is achieved. The design mode of middle section strengthening rib does: the method comprises the steps of firstly determining the height of the appearance of a reinforcing rib according to the light path enveloping appearance and size in a main frame, reserving a gap of 10-20 mm between the reinforcing rib and light rays to avoid light blocking, determining the distance between the reinforcing ribs according to a stray light analysis result to shield stray light for one time and reflect the stray light for multiple times, then performing structural rigidity analysis, and if the distance is not met, additionally adding an auxiliary reinforcing rib, wherein the height of the auxiliary reinforcing rib is lower to avoid the influence on the stray light eliminating effect.
A45-degree inclined plane 10 on the upper portion of a front frame 6 is a mounting flange of a light shield, a reflector opening and a focal plane opening are arranged on the front frame 6 and a rear frame 8, the shape of the opening is determined according to the shape of the reflector, and reinforcing ribs are arranged on the periphery of the reflector opening.
The bosses on the surfaces of the main frame 1 at the mounting points are different in height, and the height of the bosses on the surfaces with high requirements on form and position tolerance is higher. The reflecting mirror mounting plate 2, the focal plane mounting plate 3, the embedding sleeve 4, the reflecting mirror mounting plate 2, the focal plane mounting plate 3, the embedding sleeve 4 and the fastener 5 (a screw, a washer and a nut) are glued and screwed with the main frame 1, and then the size and the form and position tolerance between each pair of external interfaces are ensured through integral processing.
Structural glue is coated between the reflector mounting plate 2 and the focal plane mounting plate 3 and between the main frame 1 and is fixed through a fastener 5, and a screw of the fastener 5 is a countersunk screw which is lower than the outer surfaces of the reflector mounting plate 2 and the focal plane mounting plate 3, so that the whole processing of the frame supporting structure is facilitated.
As shown in fig. 4 and 5, two kinds of main frame insert connection are schematically shown. In the connection mode shown in fig. 4, the insert 4 is screwed out from the inside of the main frame 1, and the external thread of the insert 4 and the lower surface of the flange are coated with structural adhesive. In the connection mode shown in fig. 5, the insert 4 is screwed inwards from the outer side of the main frame 1, and the external thread of the insert 4 and the lower surface of the flange are coated with structural adhesive.
As shown in fig. 6, which is a schematic view of the insert 4 of the present invention, the cylindrical surface of the flange of the insert is milled to form a plane, which facilitates the installation of the insert. In order to avoid the redundant materials during the final assembly of the camera, the internal threads of the bushing are all blind holes.
In the embodiment, the main frame integrally formed by the SiC/C composite material (the three-dimensional sewing and needling process is adopted, and then the reaction sintering is integrally carried out), so that the light weight, high rigidity and high stability of the off-axis three-side-up surveying and mapping camera supporting structure are ensured, the space position between the camera optical parts is favorably ensured, and the ground assembling and debugging test of the camera is also favorably carried out.
The above-described embodiments are merely preferred embodiments of the present invention, and general changes and substitutions by those skilled in the art within the technical scope of the present invention are included in the protection scope of the present invention.
The invention has not been described in detail in part in the common general knowledge of a person skilled in the art.
Claims (8)
1. The off-axis three-mirror surveying and mapping camera supporting structure is characterized by comprising a main frame, a reflector mounting plate, a focal plane mounting plate and an embedding sleeve; the main frame is integrally formed by SiC/C composite materials so as to provide integral rigidity of the whole structure and comprises a front frame, a middle section and a rear frame; the front frame and the rear frame are provided with a reflector opening and a focal plane opening, and the middle section is of a skin reinforced structure; an inclined plane is arranged on the middle section and is used as an installation flange of the light shield; the reflector mounting plate and the focal plane mounting plate are made of metal materials and are mounted on the main frame through the embedding sleeve and the fastening piece.
2. The support structure of claim 1, wherein: the reinforcing ribs in the middle section skin play a role in reinforcing the flexural rigidity of the skin on one hand, and on the other hand, the appearance, the height and the distance of the reinforcing ribs are designed according to the stray light analysis result to shield primary and secondary reflection stray light and play a role in eliminating stray light.
3. The support structure of claim 2, wherein: the middle section skin internal reinforcing rib is designed in the following mode:
determining the height of the appearance of the reinforcing rib according to the light path enveloping appearance and the size in the main frame, and reserving a gap of 10-20 mm between the reinforcing rib and the light;
determining the distance between the reinforcing ribs according to the stray light analysis result so as to shield primary stray light and multiple times of reflected stray light;
and (4) analyzing the structural rigidity, if the structural rigidity is not satisfied, additionally adding an auxiliary reinforcing rib, and avoiding the influence on the stray light eliminating effect due to the height of the auxiliary reinforcing rib.
4. The support structure of claim 1, wherein: the front frame and the rear frame are closed towards the outer side panel, and the inner side panel is provided with holes.
5. The support structure of claim 1, wherein: the main frame is provided with mounting points of the components on the off-axis three-mirror surveying and mapping camera, and the higher the boss height on the surfaces of the mounting points, the higher the corresponding form and position tolerance requirement.
6. The support structure of claim 1, wherein: the embedded sleeve is cylindrical with a flange, internal threads are arranged from the flange end to the cylinder, and the internal threads are blind holes; the cylinder is provided with external threads.
7. The support structure of claim 6, wherein: the embedding sleeve is screwed out from the inner side of the main frame or screwed in from the outer side, the outer threads of the embedding sleeve and the lower surface of the flange are coated with structural adhesive, and the main frame of the mounting plate is fixedly connected at the flange part through a fastener.
8. The support structure of claim 1, wherein: the carbon fiber preform of the main frame is formed by adopting a three-dimensional sewing and needling process, and then the whole body is subjected to reaction sintering, and the manufactured main frame is a SiC/C composite material integrally formed product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110432105.4A CN113238337A (en) | 2021-04-21 | 2021-04-21 | Off-axis three-reflection surveying and mapping camera supporting frame structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110432105.4A CN113238337A (en) | 2021-04-21 | 2021-04-21 | Off-axis three-reflection surveying and mapping camera supporting frame structure |
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| CN113238337A true CN113238337A (en) | 2021-08-10 |
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| CN202110432105.4A Pending CN113238337A (en) | 2021-04-21 | 2021-04-21 | Off-axis three-reflection surveying and mapping camera supporting frame structure |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201653412U (en) * | 2009-12-30 | 2010-11-24 | 北京控制工程研究所 | Double-probe optical sensor light shield |
| US20120200914A1 (en) * | 2010-06-01 | 2012-08-09 | Horton Richard F | Two mirror unobscured telescopes with tilted focal surfaces |
| CN103758842A (en) * | 2014-01-29 | 2014-04-30 | 广西玉柴机器股份有限公司 | Thread bushing structure |
| CN108227339A (en) * | 2017-12-27 | 2018-06-29 | 北京空间机电研究所 | A kind of space camera focal plane frame |
| CN209101126U (en) * | 2018-12-27 | 2019-07-12 | 天津市贝斯特防爆电器有限公司 | A kind of LED anti-corrosion explosion-proof platform lamps and lanterns |
| CN111999873A (en) * | 2020-08-10 | 2020-11-27 | 北京空间机电研究所 | Linear array push-broom type three-reflector off-axis camera stray light suppression structure |
| CN112394597A (en) * | 2020-11-30 | 2021-02-23 | 北京空间机电研究所 | Full carbon fiber high stability space camera optical machine structure |
-
2021
- 2021-04-21 CN CN202110432105.4A patent/CN113238337A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201653412U (en) * | 2009-12-30 | 2010-11-24 | 北京控制工程研究所 | Double-probe optical sensor light shield |
| US20120200914A1 (en) * | 2010-06-01 | 2012-08-09 | Horton Richard F | Two mirror unobscured telescopes with tilted focal surfaces |
| CN103758842A (en) * | 2014-01-29 | 2014-04-30 | 广西玉柴机器股份有限公司 | Thread bushing structure |
| CN108227339A (en) * | 2017-12-27 | 2018-06-29 | 北京空间机电研究所 | A kind of space camera focal plane frame |
| CN209101126U (en) * | 2018-12-27 | 2019-07-12 | 天津市贝斯特防爆电器有限公司 | A kind of LED anti-corrosion explosion-proof platform lamps and lanterns |
| CN111999873A (en) * | 2020-08-10 | 2020-11-27 | 北京空间机电研究所 | Linear array push-broom type three-reflector off-axis camera stray light suppression structure |
| CN112394597A (en) * | 2020-11-30 | 2021-02-23 | 北京空间机电研究所 | Full carbon fiber high stability space camera optical machine structure |
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