CN112578528B - Secondary mirror supporting structure capable of reducing turbulence phenomenon in optical system and optical system - Google Patents
Secondary mirror supporting structure capable of reducing turbulence phenomenon in optical system and optical system Download PDFInfo
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- CN112578528B CN112578528B CN202011625424.9A CN202011625424A CN112578528B CN 112578528 B CN112578528 B CN 112578528B CN 202011625424 A CN202011625424 A CN 202011625424A CN 112578528 B CN112578528 B CN 112578528B
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- secondary mirror
- optical system
- reducing turbulence
- support
- support structure
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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
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
-
- 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
- G02B7/183—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors specially adapted for very large mirrors, e.g. for astronomy, or solar concentrators
-
- 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
- G02B7/198—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors with means for adjusting the mirror relative to its support
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Life Sciences & Earth Sciences (AREA)
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Abstract
The invention relates to a secondary mirror supporting structure capable of reducing turbulence phenomenon in an optical system and the optical system, comprising a secondary mirror base and at least two supporting rods, wherein one end of each supporting rod is connected with the secondary mirror base, and the supporting rods are arranged at intervals in the circumferential direction of the secondary mirror base; the surface of the support rod is provided with an axial flow guide surface. The secondary mirror supporting structure not only can support the secondary mirror, but also can prevent air flow in the lens cone from interacting with the secondary mirror support to form turbulent flow around the secondary mirror in the process of actively supplying air to the optical system, thereby preventing wave aberration generated by transmitted light.
Description
Technical Field
The invention relates to the technical field of optical systems, in particular to a secondary mirror supporting structure capable of reducing turbulence in an optical system and the optical system.
Background
The traditional optical window is difficult to obtain due to the difficulty in material obtaining and processing and manufacturing, and large-caliber manufacturing cannot be realized. Therefore, for a large-aperture optical system, the interior is in gaseous communication with the environment. In order to prevent impurities such as dust and water vapor in the environment from entering the optical system, flow field control is often performed on the optical system.
In general, the secondary mirror of the large-aperture optical system is fixed to the lens barrel through a support structure. When the airflow controlled by the flow field interacts with the secondary mirror support, turbulent flow is formed around the secondary mirror, and the density change of the turbulent flow field can cause wave aberration of light transmitted in the flow field.
The Chinese patent document with the application number of 201911278769.9 discloses a secondary mirror supporting structure, which can keep high surface shape precision, provide high structural rigidity, facilitate athermalization design and meet the requirement of severe airborne environment.
Chinese patent document No. 201420560455.4 discloses a secondary mirror support structure. The utility model discloses a can solve the automatic heat dissipation in position between space camera primary and secondary mirror, restrain optical system stray light and adjust the coaxial scheduling problem of primary and secondary mirror optics.
Chinese patent document 201521052150 discloses a secondary mirror supporting structure. The secondary mirror support structure comprises a secondary mirror seat, a secondary mirror connecting rod, a secondary mirror connecting ring and a secondary mirror connecting rod, wherein the shape of the secondary mirror connecting rod consists of a triangular part and an I-shaped part, and the requirements of light weight, high specific rigidity, small shielding ratio and low self-weight deformation can be met.
However, the above documents only design the secondary mirror structure in terms of mechanical performance (stiffness, mass) and optical design (no thermalization, obscuration ratio). The technical problem that the influence of the same-time mirror support interaction of the flow field control airflow on the light beam in the actual engineering cannot be solved.
Disclosure of Invention
The present invention provides a secondary mirror support structure and an optical system capable of reducing turbulence in the optical system.
The invention is realized by the following technical scheme:
the secondary mirror supporting structure capable of reducing turbulence in an optical system comprises a secondary mirror base and at least two supporting rods, wherein one end of each supporting rod is connected with the secondary mirror base, and the supporting rods are arranged at intervals in the circumferential direction of the secondary mirror base; the surface of the support rod is provided with an axial flow guide surface.
Preferably, the support rods are arranged at equal intervals around the circumferential direction of the secondary lens holder.
Further preferably, there are 3 or 4 support rods.
Preferably, the cross section of the support rod is kidney-shaped or streamline.
Further preferably, the support rods are radially arranged.
Preferably, the secondary mirror base is integrally manufactured with the support rod.
An optical system capable of reducing turbulence phenomenon comprises a primary mirror, a lens barrel, a secondary mirror and a secondary mirror supporting structure, wherein the primary mirror is installed at one end of the lens barrel, the secondary mirror supporting structure is coaxially installed at the other end of the lens barrel, and the secondary mirror is installed on a secondary mirror seat.
Furthermore, a plurality of air inlets are arranged on the side wall of one end of the lens cone close to the main mirror.
Furthermore, the air inlets are provided with a plurality of rows along the circumferential direction, and each row is arranged in a straight line along the axial direction.
Compared with the prior art, the invention has the following beneficial effects:
the secondary mirror supporting structure not only can support the secondary mirror, but also can prevent air flow in the lens cone from interacting with the secondary mirror support to form turbulent flow around the secondary mirror in the process of active air supply of the optical system, so as to prevent wave aberration generated by transmitted light.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention.
FIG. 1 is a schematic structural view of a secondary mirror support structure;
FIG. 2 isbase:Sub>A cross-sectional view taken at A-A of FIG. 1;
FIG. 3 is a cross-sectional view of a streamlined brace rod;
FIG. 4 is a three-dimensional view of the optical system in the secondary mirror orientation;
FIG. 5 is a three-dimensional view of the optical system in the direction of the primary mirror;
FIG. 6 is a cross-sectional view of a support rod according to one embodiment;
FIG. 7 is a diagram of turbulence distribution within a lens barrel when a conventional secondary mirror support structure is employed;
fig. 8 is a diagram of turbulence distribution within a lens barrel when the secondary mirror support structure of the present invention is employed.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
As shown in fig. 1, 2 and 3, the secondary mirror support structure 4 for reducing turbulence in an optical system disclosed in the present invention includes a secondary mirror base 41 and at least two support rods 42, wherein one end of each support rod 42 is connected to the secondary mirror base 41, and the other end of each support rod 42 extends radially.
The support rods 42 are arranged at intervals around the circumferential direction of the sub-mirror mount 41. In the present embodiment, the secondary lens holder 41 and the support rod 42 are integrally manufactured.
The surface of the support rod 42 has an axial guiding surface 421. The axial guiding surface 421 can guide the airflow to flow axially, so as to avoid the airflow from accumulating around the secondary mirror to generate turbulence.
The cross-sectional shape of the support rod 42 is appropriately set as needed. In this embodiment, the cross-section of the support rod 42 is kidney-shaped or streamlined.
The size of the support rod 42 is related to the size of the secondary mirror 3 and the lens barrel 2; the number of support rods 42 is related to the weight of the assembly formed by the secondary mirror 3 and the secondary mirror mount 41. Preferably, there are at least 3 support rods 42.
As shown in fig. 4 and 5, the optical system capable of reducing the turbulence disclosed in the present invention includes a primary mirror 1, a lens barrel 2, a secondary mirror 3, and a secondary mirror support structure 4, wherein the primary mirror 1 is installed at one end of the lens barrel 2, the secondary mirror support structure 4 is coaxially installed at the other end of the lens barrel 2, one end of a support rod 42 far away from a secondary mirror base 41 is connected with the lens barrel 2, and the secondary mirror 3 is installed on the secondary mirror base 41.
The side wall of the lens barrel 2 near one end of the main mirror 1 is provided with a plurality of air inlet holes 21. The air inlet holes 21 are arranged in a plurality of rows along the circumferential direction, and each row is arranged in a straight line along the axial direction.
Based on the optical system capable of reducing the turbulence phenomenon, the invention discloses an embodiment.
Example one
In this embodiment, the diameter of the primary mirror 1 is 1m, and the diameter of the secondary mirror 3 is 0.2m. The gas in the lens barrel 2 is air, and the pressure P is 1 atm; the diameter of the air inlet 21 is 0.01m, the axial distribution range is 10m, 10 rows are distributed along the circumference, and the hole distance of the same row is 0.02m.
The number of the support rods 42 is 4 along the circumferential direction.
As shown in fig. 6, the cross section of the support rod 42 is kidney-shaped, the length L is 0.04mm, the thickness H is 0.02mm, and the radius R of the axial guiding surface 421 is 0.009mm.
The flow field control gas enters the lens barrel 2 from one end of the lens barrel 2 where the secondary mirror 3 is installed, and the flow field control gas is clean air.
As shown in FIG. 7, with a conventional secondary mirror support structure, the incoming airflow interacts with the secondary mirror support to form two symmetric vortices around the secondary mirror with an axial length greater than a radial length.
As shown in fig. 4, 5 and 8, when the secondary mirror support structure of the present invention is adopted, when the airflow passes through the secondary mirror support, the axial flow guide surface 421 of the secondary mirror support has a flow guide effect, which can prevent the airflow from accumulating around the secondary mirror 3 to generate turbulence, so that the effects of the intake airflow and the secondary mirror support are not obvious, two vortices are concentrated around the primary mirror 1, and the vortices around the primary mirror 1 can be eliminated through the optimized design of the parameters of the air inlet 21.
The above embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. Secondary mirror bearing structure of torrent phenomenon in reducible optical system, its characterized in that: the auxiliary lens seat comprises an auxiliary lens seat and at least two supporting rods, wherein one end of each supporting rod is connected with the auxiliary lens seat, one end of each supporting rod, which is far away from the auxiliary lens seat, is used for being connected with a lens barrel, and the supporting rods are arranged at intervals in the circumferential direction of the auxiliary lens seat;
the surface of the support rod is provided with an axial flow guide surface, the axial direction of the axial flow guide surface is the optical axis direction of the optical system, the cross section of the support rod is waist-shaped or streamline-shaped, and the axial flow guide surface is a curved surface designed at two ends of the cross section of the support rod.
2. The secondary mirror support structure for reducing turbulence in an optical system as recited in claim 1, wherein: the support rods are arranged at equal intervals around the circumferential direction of the secondary lens base.
3. The secondary mirror support structure for reducing turbulence in an optical system as recited in claim 2, wherein: the number of the supporting rods is 3 or 4.
4. A secondary mirror support structure for reducing turbulence in an optical system as recited in claim 1, 2 or 3, wherein: the support rods are arranged radially.
5. The secondary mirror support structure for reducing turbulence in an optical system as recited in claim 1, wherein: the secondary mirror seat and the supporting rod are integrally manufactured.
6. An optical system capable of reducing turbulence phenomenon, comprising a primary mirror, a lens barrel and a secondary mirror, characterized in that: it further comprises a secondary mirror support structure according to any of claims 1-5, the primary mirror being mounted at one end of the barrel, the secondary mirror support structure being coaxially mounted at the other end of the barrel, the secondary mirror being mounted on a secondary mirror mount.
7. The optical system for reducing turbulence as recited in claim 6, wherein: the side wall of the lens cone close to one end of the main mirror is provided with a plurality of air inlets.
8. The optical system for reducing turbulence as recited in claim 7, wherein: the air inlet holes are arranged in a plurality of rows along the circumferential direction, and each row is arranged in a straight line along the axial direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011625424.9A CN112578528B (en) | 2020-12-30 | 2020-12-30 | Secondary mirror supporting structure capable of reducing turbulence phenomenon in optical system and optical system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011625424.9A CN112578528B (en) | 2020-12-30 | 2020-12-30 | Secondary mirror supporting structure capable of reducing turbulence phenomenon in optical system and optical system |
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| CN112578528A CN112578528A (en) | 2021-03-30 |
| CN112578528B true CN112578528B (en) | 2023-03-31 |
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| US5069538A (en) * | 1990-02-02 | 1991-12-03 | Navistar International Transportation Corp. | Aerodynamic deflector for a rear view mirror with an integral side marker light |
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