Mirror

 

(57) Abstract:

Usage: in laser technology, in the optical path of the laser processing units. The inventive mirror includes a substrate with an optical surface and a base with a through channels located between the rear and the reflecting surfaces of the mirror. From the back side of the Foundation made channels to the intersection with through channels located between the rear and the optical surfaces. The ratio of the number of through channels to the number of channels on the backside of the basis chosen is 0.5, and the ratio of their diameters in the range of 1 to 3. The diameter of the through channels selected from a ratio of 0.3 to 0.6 of the height of the mirror H and the number selected from (1 to 2.5) D /H where D is the diameter or the diagonal mirror, H the height of the mirror. The surface of the through-channels can be made developed. 3 C.p. f-crystals, 1 Il.

The invention relates to laser technology and can be used in measuring equipment, astronomical instruments, solar concentrators, in the optical path of the laser processing units.

Known optical mirror [1] is a monolithic block with reflective working and tyleno with them cylindrical cavities of different shapes, in which the distance Z between the axes of the cavities due to their diameter ratio

1/2 DZD

The disadvantage of this mirror is considerable porosity of the monolithic mirror and the presence of closed volumes, which consequently reduces the rigidity of the mirror and creates uneven heating it under load in the thickness and diameter of the mirror, resulting in a loss of geometric stability of the mirror.

Closest to the proposed technical solution is lightweight optical mirror [2] contains end-to-end internal cavity located between the rear and the reflecting surfaces, the axes of which are connected with each other at the intersection.

A disadvantage of the known mirror is the large porosity of the basics that impedes heat transfer from the warmer upper part of the basis to the less heated rear side of the base, creating a significant temperature drop across the thickness of the base, leading to large bending stresses mirrors, reducing its efficiency.

The objective of the invention increase the geometric stability and health of a mirror with forced air cooling.

Tasked with resetselection mirrors, as well as lowering the average temperature of the mirror.

This is achieved by the fact that in the known mirror containing a base with a through channels located between the rear and reflective surfaces on the back side of the Foundation made channels to the intersection with through channels, the ratio of the number of through channels to the channels on the backside of the basis chosen is 0.5, and the ratio of their diameters, respectively, in the range of 1-3, with part of the surface through channels adjacent to the rear side of the base, made of insulating screens, and the outer side of the mirror is thermally insulated. The diameter of the through channels selected from a ratio of 0.3 to 0.6 of the height of the mirror N, and the number of through channels selected from (1-2,5).D/H where D is the diameter or the diagonal mirror; H the height of the mirror. On part of the surface through channels adjacent to the working surface mirrors made grooves trapezoidal, triangular or rectangular shape.

The invention consists in that the mirror system of ducts for forced air cooling or efficient use of natural convection for cooling internal cavities and heat distribution within the grain is Ginnie voltage, because teploizolyatsii the lower part of the base with one hand insulating screens mounted on the side surface of the through channels, and on the other hand the insulation located on the outer side of the mirror, and the upper part of the base, adjacent to the optical surface, intensively cooled by the entry of air through the channels and the channels located on the rear side of the base. To minimize the influence of the porosity of the framework in the form of through-channels, it is suggested to run the system through the cooling channels mainly in the field neutral plane of the mirror, in this implementation porosity influence on the rigidity of the mirror is at a minimum and this will lead to a minimal increase in Flexural components of stress and displacement, and at the same time, thermal barriers are arranged on the side surface of the through channels adjacent to the rear side of the base, to reduce heat transfer into the environment from the rear surface of the mirror, and embossing is performed on part of the surface through the cooling channels adjacent to the working surface of the mirror, increase heat dissipation from the top of the mirror, as if to force the heat transfer on the surface of the channels, adjacent to the reflective surface, when the force of the air flow in the channels can be increased about 10 times. In addition, the heat exchange surface of the upper part of the basis increases due to the introduction of riffles in the form of grooves on the surface of the channels, which, in addition, create an additional turbulization of air. In the complex all this improves the redistribution of heat in the mirror, the reduction of the average temperature, reducing the temperature difference, and thus reducing the bending component of the stresses and displacements of the optical surface in comparison with the prototype, i.e., increases the geometric stability of the mirror.

The ratio of the number of channels 0.5 and their diameters in the range of 1-3 selected from conditions ensure effective cooling of the upper part of the basics of air, by increasing the heat transfer coefficient while maintaining sufficient rigidity of the mirror.

The diameter of the through channels selected in the range of 0.3 to 0.6 of the height of the mirror, and the number of relationship (1-2,5) D/H of conditions maximize heat removal from the upper part of the base, adjacent to the optical surface, and heat transfer through the substrate from the upper part to the lower back when Tanami, the surface-mounted through-channels, and the insulation on the outside of the mirror.

The invention is illustrated in the drawing, which shows a base 1, a substrate with an optical surface 2, the through channels 3 with grooves trapezoidal, rectangular or triangular form 4, channel 5 from the back side of the mirror, insulating screens 6, the insulation 7.

The device operates as follows.

The base 1 is heated by rays absorbed by the optical surface 2. Part of the heat is transferred to the bottom of the base, and a part of the heat removed from the outer surfaces of the mirrors and from the surfaces of the channels.

Heat transfer by convection is enhanced by increasing the heat exchange surface due to implemented on the channel grooves 4 different shapes, such as rectangular, but also because of the turbulence of the air in the channels.

The amount of heat penetrating from the heated parts of the stem adjacent to the optical surface to the rear is limited by the insulating screens 6. The air entering through the channels 5, with the back side of the Foundation increases the local heat transfer coefficient and thereby helps to equalize the temperature of the upper>A specific example is the number of mirrors with a diameter of 260-500 mm Material mirrors copper, molybdenum, height mirrors 100-150 mm

For example, in the mirror of diameter 350 mm, height 120 mm in the basis of the executed 4 through overlapping holes with a diameter of 60 mm and at the rear side of the framework 4 holes with a diameter of 60 mm to the intersection with the hole. On the surface of the through holes are ring groove depth of 1-3 mm, width 3 mm, pitch 10 mm On a side surface of the through channels glued to the screens of steel 12 18CR10NITI thickness of 0.5-1 mm with insulation absorbing coating. On the back of the bases attached heat insulating screen of 12CR18NI10TI steel thickness of 1 mm with the insulating coating.

On the rear side of the base, around the holes formed mounting holes to attach the hose system for the forced cooling of mirrors air.

Thus, the proposed design mirrors with forced air cooling provides efficient heat removal from the heated part of the framework, the transfer of heat to the rear of the base, which helps to equalize the temperature across the thickness of the mirror and reduced average temperature without reducing Indorama substrate with an optical surface and a base with a through channel, located between the rear and the reflecting surfaces, characterized in that the back side of the Foundation made channels to the intersection with through channels, the ratio of the number of through channels to the channels on the backside of the basis chosen is 0.5, and the ratio of their diameters, respectively, in the range of 1 to 3, with part of the surface through channels adjacent to the rear side of the base, made of insulating screens, and the outer side of the mirror is thermally insulated.

2. Mirror under item 1, characterized in that the diameter of the through channels selected from a ratio of 0.3 to 0.6 of the height of the mirror.

3. The mirror on the PP.1 and 2, characterized in that the number of channels selected from (1 to 2.5) D / H where D is the diameter or the diagonal mirror, H is the height of the mirror.

4. The mirror on the PP. 1 to 3, characterized in that part of the surface through channels adjacent to the working surface mirrors made grooves of trapezoidal, triangular or rectangular shape.

 

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