SU1327042A1 - Telescope of cassegrainian system - Google Patents

Abstract

The invention relates to optical instrumentation and reduces the weight of the telescope. In the hole of the main mirror 1 of the telescope there is a centerpiece 6 in the form of a hollow cylinder with four longitudinal ribs and with a flange for mounting the mirror 1, which is a metal-glass piece, in which there are cells. Inside the cylinder there is a lens corrector 3, which creates an image of an object outside the rear part of the tube. The front part of the pipe is formed by rods 4, bent along the lateral edges of two unequal four-faceted pyramids, in the free end of which the node of the secondary mirror 5 is placed. 1 Cp , 1 Il. (L

Description

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The invention relates to telescoping and can be used to create telescopes mounted on stratostatos and spacecraft.

The aim of the invention is to reduce the weight of the telescope.

The drawing schematically shows the proposed telescope.

The telescope consists of a main mirror 1, a secondary mirror 2 and a lens corrector 3, united by a common pipe. The front part of the tube is a truss formed by rods 4, bent along the side edges of two symmetric uneven tetrahedral pyramids with a common base. The common base is large for each of the pyramids. The farm ends with a cylindrical part within which the secondary mirror 5 is installed, on the other side of the rod 4 of the truss is attached to the centerpiece 6, which is a hollow cylinder placed in the opening of the main mirror 1. This cylinder, which is an element of the pipe of the forest saw serves as a housing for the lens corrector 3. In the middle part, the cylinder has a flange for connecting the main mirror 1. Behind the flange there are two platforms with holes for connecting the telescope with the base. Four flat edges run along the outer surface of the center piece 6 along its forming line, and they are a continuation of the rods 4. The dimensional geometry of the pipe profile (i.e. pyramid shape, rib section, cylinder diameter, etc.) is determined by optimal ratio of weight, mechanical and optical characteristics of the telescope, depending on its purpose.

The main mirror 1 is a metal-glass part, in the body of which, in order to reduce the weight, cells are made concentric by themselves.

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45 n gc and

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As an example of a specific implementation of this design scheme, one can cite a telescope designed to study Halle comet. The diameter of the main mirror is 240 mm, the diameter of the secondary mirror is 120 mm. The heights of the pyramids forming the front of the pipe refer to the diameter of the secondary

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th mirrors respectively, as 0.8 and 4.5.

The circumference diameter described around the common base of the pyramids is 1.3 times the diameter of the secondary mirror. In the body of the main mirror there are cells, which are located on their own. The depth of the cell is three quarters of the thickness of the mirror. The diameter of the cells decreases in proportion to the radius of their distance from the center of the mirror. The angular step size of the cells in the network remains constant for all the shots, however, the cells of each subsequent strip are shifted relative to the cells of the preceding chain by half the step.

This arrangement of cells allows the part to remain rigid, significantly reducing its weight.

The radius of the mounting holes in the body of the mirror is half the radius of the mirror.

The ribs forming the front part of the pipe, as well as the ribs running along the generator-rear cylinder, in cross section are an I-beam, oriented in height, along the radius from the center to. support point. The ratio of the width of the cross section of the I-beam to its height is 1/5, the thickness of the vertical edge of the I-beam is 1/2 of its width. The material for the manufacture of all structural elements is titanium. The homogeneity of the material of structural elements and mirrors allows to take into account. temperature changes in the position of the main optical elements and minimize their influence on the image quality.

The telescope operates as follows.

A beam of light energy from the object 45 of observation falls on the main mirror 1 and, reflected from it, falls onto the secondary mirror 2. Reflecting from the secondary mirror 2 and passing through the lens corrector 3, the beam of light is focused at some distance beyond the rear of the pipe by creating an image of the object. Devices for visual, photographic gc or photoelectric recording are placed in the focal plane. In the specific performance of the telescope in the focal plane is located the photodetector of the transmitting television system.

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Claims (2)

1. Cassegrain system telescope inside a hollow cylinder, rods out- containing telescopes installed in the pipe body curved along the side edges of the osprey main mirror with two centrally different tetrahedral pi-holes, secondary mirrored amide unit with common base, and hollow cyan and lens corrector, Moreover, the tubalandr is equipped with four longitudinal telescopes and includes a gutter and rods, edges that are extensions connecting the gutter with the secondary hub. from the mirror, from whether 2. The telescope of claim 1, in order to reduce the weight, with the fact that the main mirror medium is made in the form of a placed glass made of metal-glass with concentric cells in the hole of the main mirror of the hollow with a cylinder with a flange, the main mirror of 5RZ on the back side.