CN112859275A - Cold optics self-adaptation thermal deformation compensation structure based on Archimedes spiral - Google Patents
Cold optics self-adaptation thermal deformation compensation structure based on Archimedes spiral Download PDFInfo
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- CN112859275A CN112859275A CN202110075365.0A CN202110075365A CN112859275A CN 112859275 A CN112859275 A CN 112859275A CN 202110075365 A CN202110075365 A CN 202110075365A CN 112859275 A CN112859275 A CN 112859275A
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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
- G02B7/008—Mountings, adjusting means, or light-tight connections, for optical elements with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation
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Abstract
The invention relates to a cold optics self-adaptive thermal deformation compensation structure based on an Archimedes spiral line, which aims to solve the problem that the imaging quality is influenced by severe deformation and position deviation of an optical element due to deformation stress generated at the joint of optical components caused by different shrinkage in the cooling process of the optical components made of different materials. The structure comprises an annular body, wherein the annular body comprises a rigid support flange and a matching mounting ring connected to the inner periphery of the rigid support flange, the disc surface of the rigid support flange is respectively and uniformly provided with N spiral line units and N first connecting holes along the circumferential direction, the N spiral line units and the N first connecting holes are distributed at intervals, and the centers of the spiral line units and the first connecting holes are positioned at different circumferential positions of the rigid support flange; the spiral line unit comprises a second connecting hole and an Archimedes spiral groove, the Archimedes spiral groove takes the second connecting hole as the center and meets the Archimedes spiral equation, and therefore an Archimedes spiral line flexible body is formed on the rigid supporting flange.
Description
Technical Field
The invention relates to a cold optics self-adaptive thermal deformation compensation structure based on an Archimedes spiral line.
Background
With the development of infrared remote sensing technology, the working temperature of a luminescence infrared system is lower and lower, and the requirement on the surface shape of an optical element is higher and higher. The processing, assembly and transportation of the low-temperature optical structure are usually carried out at normal temperature, the actual working temperature can reach 100K (-173 ℃), the strict requirement can reach 5K (-268 ℃), the temperature span can reach 288K, and the high requirement is provided for the temperature adaptability of the support structure.
In order to meet the requirements of optical element surface shape in low temperature environment, different optical elements are made of materials matched with the optical elements to form a supporting structure. Because the linear expansion coefficients, specific heat capacities and other performance parameters of different supporting structure materials are different, and the performance parameters are in nonlinear change along with temperature change, the shrinkage of different optical components in the cooling process is different, so that huge deformation stress is generated at the joint of the components, even damage is caused, further deformation and position deviation of an optical element are caused, and the imaging quality of the low-temperature infrared optical system is directly influenced. How to reduce or even eliminate the temperature deformation stress between the optical components made of different materials is the key of the structural design of the low-temperature infrared optical system.
At present, the low-temperature infrared optical system is mainly designed in a homogeneity mode at home and abroad, namely the whole system is processed by selecting the same material, so that the deformation difference among different optical components is avoided, however, the difference of the material performance of optical elements restricts the realization of the homogeneity, and therefore, the scheme is only suitable for a metal mirror reflection system. The other scheme is to design the relative freedom degree between the optical element and the supporting structure, the supporting structure and the optical element are not fixedly connected, and the deformation stress is released through the relative movement between the optical element and the supporting structure. The scheme has high requirement on the matching machining precision between the optical element and the supporting structure, and also provides higher challenge for assembly, and the high surface shape precision is difficult to realize at present.
The two schemes can not effectively and conveniently meet the requirements of high surface shape precision and low deformation stress of the low-temperature infrared optical system under the condition of large temperature difference.
Disclosure of Invention
The invention aims to solve the problems that in the prior art, under a large temperature difference of a low-temperature infrared optical system, different material optical components generate deformation stress at the joint of the components due to different shrinkage amounts in the cooling process, so that the optical elements deform violently and the position of the optical elements deviates, and the imaging quality is influenced, and provides a cold optical self-adaptive thermal deformation compensation structure based on Archimedes spiral lines.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a cold optical self-adaptive thermal deformation compensation structure based on Archimedes spiral is characterized in that: the low-temperature optical module comprises an annular body, a first connecting piece and a second connecting piece, wherein the annular body is used for connecting and supporting two low-temperature optical components made of different materials;
the annular body comprises a rigid support flange and a matching mounting ring connected to the inner periphery of the rigid support flange;
the matching mounting ring is used for matching and clamping with the low-temperature optical component made of the first material;
the disc surface of the rigid support flange is respectively and uniformly provided with N spiral line units and N first connecting holes along the circumferential direction, the N spiral line units and the N first connecting holes are distributed at intervals, and the centers of the spiral line units and the centers of the first connecting holes are located at different circumferential direction positions of the rigid support flange; n is more than or equal to 3;
the first connecting hole is used for being matched and connected with a low-temperature optical component made of a first material;
the spiral line unit comprises a second connecting hole and an Archimedes spiral groove;
the second connecting hole is used for being matched and connected with a low-temperature optical component made of a second material;
the Archimedes spiral groove takes the second connecting hole as the center and meets the Archimedes spiral equation, so that an Archimedes spiral flexible body is formed on the rigid supporting flange; the Archimedes spiral flexible body takes the second connecting hole as the center and meets the Archimedes spiral equation.
Furthermore, a plurality of reinforcing ribs are arranged in the Archimedes spiral groove and are used for enhancing the internal rigidity of the Archimedes spiral flexible body; the reinforcing ribs are arranged in a mode that the Archimedes spiral groove is disconnected, and the rigid support flange disc surface is reserved at the disconnected position.
Further, the annular body is made of a titanium alloy material through machining.
Further, N is 8.
Further, the number of the reinforcing ribs is 3.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a cold optics self-adaptive thermal deformation compensation structure based on an Archimedes spiral, which is respectively matched and connected with low-temperature optical components made of two different materials through N first connecting holes and N second connecting holes on an annular body, and comprehensively releases the deformation stress and the thermal stress of the components made of different materials due to temperature change through an Archimedes spiral flexible body of N spiral units, thereby effectively solving the problem of the deformation stress generated at the joint of the components due to the deformation difference caused by large temperature difference between processing assembly and actual working environment of the optical components made of different materials in a low-temperature infrared optical system; according to the characteristics of the Archimedes spiral, the flexible body of the Archimedes spiral can release the stress more smoothly and fully.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a luminescence adaptive thermal deformation compensation structure based on Archimedes' spiral according to the present invention;
FIG. 2 is a cross-sectional view of an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a spiral line unit in an embodiment of the present invention;
FIG. 4 is a graph of the fundamental frequency of the annular body corresponding to different turns of the flexible body of the Archimedes spiral in the structure for cold optical adaptive thermal deformation compensation based on Archimedes spiral of the present invention;
FIG. 5 is a graph of the fundamental frequency of the annular body corresponding to different numbers of ribs in the Archimedes spiral-based cold optical adaptive thermal deformation compensation structure of the present invention.
In the figure, 1-annular body, 2-rigid supporting flange, 3-matching mounting ring, 4-spiral line unit, 41-Archimedes spiral line flexible body, 42-Archimedes spiral groove, 43-reinforcing rib, 44-second connecting hole and 5-first connecting hole.
Detailed Description
To make the objects, advantages and features of the present invention more apparent, the luminescence adaptive thermal deformation compensation structure based on Archimedes' spiral is further described in detail with reference to the accompanying drawings and specific embodiments.
The invention provides a luminescence optical self-adaptive thermal deformation compensation structure based on an Archimedes spiral line, which is shown in figures 1 and 2 and comprises an annular body 1, wherein the annular body 1 is used for connecting and supporting low-temperature optical components made of two different materials. The annular body 1 comprises a rigid support flange 2 and a mating mounting ring 3 attached to the inner periphery of the rigid support flange 2.
The matching mounting ring 3 is used for matching and clamping with the low-temperature optical component made of the first material.
Be provided with N helix unit 4 and N first connecting hole 5 on the quotation of rigid support flange 2, N helix unit 4 and N first connecting hole 5 evenly set up along rigid support flange 2's quotation circumference respectively, and N helix unit 4 and N first connecting hole 5 interval distribution. The centers of the N spiral line units 4 are located at the same circumferential direction position of the rigid support flange 2, the centers of the N first connecting holes 5 are located at the same circumferential direction position of the rigid support flange 2, and the centers of the spiral line units 4 and the centers of the first connecting holes 5 are located at different circumferential direction positions of the rigid support flange 2; n is more than or equal to 3, and in the embodiment, N is 8.
The first connecting hole 5 is used for being matched and connected with the low-temperature optical component made of the first material, and is combined with the matching mounting ring 3 to jointly complete the mounting of the low-temperature optical component made of the first material.
As shown in fig. 3, the spiral unit 4 includes a second connection hole 44 and an archimedean spiral groove 42.
The second coupling hole 44 is adapted for mating connection with a cryogenic optical component of a second material.
The archimedes spiral groove 42 is centered on the second connection hole 44 and satisfies the archimedes 'spiral equation, thereby forming the archimedes' spiral flexible body 41 on the rigid support flange 2. The archimedes 'spiral flexible body 41 is centered on the second connection hole 44 and satisfies the archimedes' spiral equation. In the actual production process, the archimedes spiral flexible body 41 is designed according to the archimedes spiral equation, the structural rigidity and other requirements, and the archimedes spiral groove 42 is processed after the width of the archimedes spiral flexible body 41 is determined.
A plurality of reinforcing ribs 43 are further arranged in the archimedes spiral groove 42 and used for reinforcing the internal rigidity of the archimedes spiral flexible body 41. The reinforcing ribs 43 are arranged in a manner that the Archimedes spiral groove 42 is broken, and the disc surface of the rigid support flange 2 is kept at the broken position. The number of the reinforcing ribs 43 is determined according to the structural rigidity requirement, and in the embodiment, the number of the reinforcing ribs 43 is 3.
In order to meet the requirements of structural rigidity and toughness, the annular body 1 is processed by adopting a titanium alloy material.
For the connection of dissimilar material low-temperature optical components with different apertures, the connection of the optical components with different apertures is realized by adjusting the circumferential radius positions of the centers of the N first connecting holes 5 and the circumferential radius positions of the centers of the N second connecting holes 44.
For the connection of dissimilar material low temperature optical components with different weights, the requirements of different rigidity and flexibility of the annular body 1 are realized by adjusting the width and the number of turns of each Archimedes spiral line flexible body 41 and the number of reinforcing ribs 43.
The different turns of the archimedes spiral flexible body 41 correspond to the base frequency of the annular body 1 as shown in table 1 and fig. 4, and as the turns of the archimedes spiral flexible body 41 increase, the base frequency of the annular body 1 gradually decreases, the structural rigidity decreases, the flexibility is enhanced, and the adaptive deformation capability is enhanced.
TABLE 1 different number of turns correspond to the fundamental frequency of the annular body
The fundamental frequencies of the annular body 1 corresponding to different numbers of the reinforcing ribs 43 are shown in table 2 and fig. 5, and as the number of the reinforcing ribs 43 increases, the fundamental frequency of the annular body 1 gradually increases, the structural rigidity increases, the flexibility decreases, and the adaptive deformation capability thereof decreases.
TABLE 2 fundamental frequencies of different numbers of ribs corresponding to the annular body
The assembly method of the luminescence optical self-adaptive thermal deformation compensation structure based on the Archimedes spiral line comprises the following steps:
1) designing and processing the annular body 1 according to the calibers and weights of the low-temperature optical components of two different materials to be connected, and cleaning the annular body after processing;
2) connecting the ring-shaped body 1 with one of the optical components through the N second connecting holes 44;
3) carry out circumference cooperation with another optical assembly with the cooperation collar 3 of ring body 1 and be connected, axial connection is carried out through a N first connecting hole 5 to the rethread, and the assembly is accomplished.
Claims (5)
1. A cold optics self-adaptation thermal deformation compensation structure based on Archimedes spiral is characterized in that: the low-temperature optical module comprises an annular body (1), wherein the annular body (1) is used for connecting and supporting low-temperature optical components made of two different materials;
the annular body (1) comprises a rigid support flange (2) and a matching mounting ring (3) connected to the inner periphery of the rigid support flange (2);
the matching mounting ring (3) is used for matching and clamping with a low-temperature optical component made of a first material;
the disc surface of the rigid support flange (2) is respectively and uniformly provided with N spiral line units (4) and N first connecting holes (5) along the circumferential direction, the N spiral line units (4) and the N first connecting holes (5) are distributed at intervals, and the centers of the spiral line units (4) and the centers of the first connecting holes (5) are located at different circumferential direction positions of the rigid support flange (2); n is more than or equal to 3;
the first connecting hole (5) is used for being matched and connected with a low-temperature optical component made of a first material;
the spiral line unit (4) comprises a second connecting hole (44) and an Archimedes spiral groove (42);
the second connecting hole (44) is used for being matched and connected with a low-temperature optical component made of a second material;
the Archimedes spiral groove (42) takes the second connecting hole (44) as the center and meets the Archimedes spiral equation, so that an Archimedes spiral flexible body (41) is formed on the rigid supporting flange (2); the Archimedes spiral flexible body (41) takes the second connecting hole (44) as the center and meets the Archimedes spiral equation.
2. The archimedean spiral-based cold optical adaptive thermal deformation compensation structure of claim 1, wherein: a plurality of reinforcing ribs (43) are arranged in the Archimedes spiral groove (42) and are used for enhancing the internal rigidity of the Archimedes spiral flexible body (41); the reinforcing ribs (43) are arranged in a mode that the Archimedes spiral grooves (42) are disconnected, and the disc surface of the rigid support flange (2) is reserved at the disconnected position.
3. The archimedean spiral-based luminescence optical adaptive thermal deformation compensation structure according to claim 1 or 2, characterized in that: the annular body (1) is made of titanium alloy materials.
4. The archimedean spiral-based cold optical adaptive thermal deformation compensation structure according to claim 3, wherein: and N is 8.
5. The Archimedes spiral-based cold optical adaptive thermal deformation compensation structure of claim 4, wherein: the number of the reinforcing ribs (43) is 3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110075365.0A CN112859275B (en) | 2021-01-20 | 2021-01-20 | Cold optics self-adaptation thermal deformation compensation structure based on Archimedes spiral |
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| CN202110075365.0A CN112859275B (en) | 2021-01-20 | 2021-01-20 | Cold optics self-adaptation thermal deformation compensation structure based on Archimedes spiral |
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| CN112859275B CN112859275B (en) | 2021-12-14 |
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