Optimization and design of the bottom support of the primary mirror chamber in the opto-electronic device

In the large-diameter opto-electronic device tracking equipment, the primary mirror usually uses the combination of the bottom support and the lateral support. Because both the bottom support and the lateral support are installed on the primary mirror chamber´s base plate, the stiffness of the base plate will show in the amount of sloshing of the primary mirror relative to the primary mirror chamber and therefore influences the tracking accuracy of the opto-electronic device. During the assembling and adjusting of the primary mirror in the actual process of working on the project, as is found that the amount of sloshing of the primary mirror relative to the primary mirror chamber is comparatively large; by full analyzing the support structure of the primary mirror, after changing the welded structure of the primary mirror chamber structure to the cast structure and improving the stiffness of the primary mirror base plate, the amount of sloshing of the primary mirror is reduced significantly. The results show that in working on the primary mirror support, the forms and structure stiffness of bottom support and lateral support should be considered, together with that the stiffness of the primary mirror chamber acting as the basis is playing the crucial role.