Large lightweight space telescope mirror

 

(57) Abstract:

Lightweight mirror space telescope consists of a monolithic block having a T-shaped longitudinal section. With its back surface are connected by a thin plate. The system facilitates holes has a radial-ring structure, radial and annular rib which is continuous throughout. Attachment points are located on the rear surface of the monolithic block on the radius, providing the condition WHmax=WBHmaxwhere WHmax=WBHmaxdeformation of the outer and inner contours reflecting the working surface of the mirror supported on the mounting point. The mirror has a high degree of relief, while maintaining sufficient rigidity of the structure. 2 Il.

The invention relates to the field of opto-electronic instrumentation, in particular for space telescopesthrough, and can be used in the development and manufacturing of large space-based optics.

Known analogue of [1], in which in order to reduce the mass of the mirror its thickness decreases as the outer and inner edges. Dostoevsky telescopes.

Known lightweight optical mirror [2], is a monolithic block with a reflective work and back surfaces, the latter of which performed regularly spaced holes, connected coaxially with him cylindrical cavities. But here is not achieved very high degree of relief, but also the lack of a solid back surface reduces the rigidity of the mirror.

Closest to the proposed invention the technical essence is large lightweight mirror space telescope [3] was chosen for the prototype. The mirror is a monolithic block with a Central hole and a reflective work and back surfaces, the latter of which is made easier holes, the location of which has a radial-ring structure. While radial and annular ribs are continuous throughout. However, this solution has drawbacks, the main of which are: insufficient degree of relief, the lack of rigidity due to the lack of continuous back surface, and the extreme difficulty of processing the internal cellular structure and the impossibility of obtaining ravintolasalia of the invention is to increase the degree of relief of the large mirror space telescope maintain high stiffness characteristics.

To perform the tasks proposed large lightweight mirror space telescope, made in the form of a monolithic block with a Central hole and a reflective work and back surfaces, the latter of which is made easier holes, the location of which has a radial-ring structure. While radial and annular ribs are continuous throughout. A feature of this mirror is the implementation of a monolithic block, the meridional cross-section of which is T-shaped. Attachment points are located on the rear surface of the monolithic block on the radius of ensuring the fulfilment of the conditions: Wnmax= WNRmaxwhere Wnmax= WNRmaxdeformation of the outer and inner contours reflecting the working surface supported on the mounting point. In addition, the mirror is equipped with a thin plate, narashima connected with the back side of the monolithic block.

High degree of relief proposed in the mirror is achieved by the following main factors. Of the mirror's mounting point transferred from external and internal contours for optimal from the point of view of deformation of lilo to burn off some of the material in the space, the limited diameter of the outer contour of the DNKand Dnand in space, the diameter of the internal circuit DKSSand DNRby performing the monolithic block is T-shaped.

Manufacturer of lightweight mirrors are, as a rule, when the bearing of the mirror back on a special discharge (either hydraulic or pneumatic). In the proposed mirror for installation of unloading is the circular area bounded by diameters of Dnand DNR. The ratio between the diameter of the outer contour of the DNKand Dnand the ratio between the diameter of the internal circuit DKSSand DNRselected such that the condition: Wnmax= WNRmaxwhere Wnmax= WNRmaxdeformation of the outer and inner contours reflecting the working surface supported on the attachment point.

Thin plate, narashima connected with the back side of the monolithic block, with low weight significantly increases the stiffness of the mirror.

In Fig.1 shows the design of the proposed invention, Fig.2 - section A-A in Fig. 1.

Depicted on ficou mirror surface 2 and the back 3. With the back side 3 narashima connected (for example anodic bonding method) thin plate 4. Location facilitates hole 5 has a radial-ring structure 6 (Fig. 2).

On optimal from the point of view of deformation of the working surface 2 radius there are special holes 7 (Fig. 1) for attachment to the frame (in this example, for example, the number of holes is equal to three).

Thus, the execution of the large mirror with a T-shaped longitudinal cross-section of a monolithic block, the back side which narashima connected with the thin plate, and the placement of the attachment points on the rear surface of the monolithic block on optimal from the point of view of deformation of the working surface radius allowed us to achieve a significant degree of relief while maintaining high rigidity of the mirror. Calculations and mathematical modeling of the proposed design of the mirror confirmed the high rigidity of the structure when reaching the degree of ease about 0,85.

Literature

1. A. Hewitt "Opticheskie and Infrakrasnye telescopes 90s",M.: Mir, 1983, S. 76-80.

2. Author's certificate N 617759, G 02 In 5/08.

3. U.S. patent N 4678293, G 02 In 5/10, 1987 - protato block with a Central hole and a reflective work and back surfaces, in the last of which is made easier holes, the location of which has a radial-ring structure, and radial and annular ribs patterns continuous throughout, wherein the monolithic block has a T-shaped longitudinal section, and the attachment points are located on the rear surface of the monolithic block on the radius of ensuring the fulfilment of conditions

Wnmax= WNRmax,

where Wnmax,WNRmaxdeformation of the outer and inner contours reflecting the working surface of the mirror supported on the attachment point, while the back side of the monolithic block narashima connected with a thin plate.

 

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