Design of supporting structure for primary mirror of large aperture theodolite

Kinematic evaluation of the whiffletree lateral support setup and its application for the mirror support of the TMT tertiary mirror

“…However, with increasing virtual equivalence circle radius, the distance between the support points in one group is reduced, which makes the design allocation small, and results in a higher local stress. Therefore, the setup proposed in Figure 3(c) represents the best possible mirror support structure compared to the other two proposed support structures [10]- [12]. Figure 4 is the TMT tertiary mirror support conceptual design [12] according to the principle of…”

Research on two assembling methods of 650 mm SiC lightweight mirror

“…The mirror surface deformation is divided into surface distortion and rigid body displacement, the latter can be eliminated, but the former can not.The surface shape error of the mirror can be accurately expressed by removing the surface shape change after the displacement of the rigid body,It is necessary to combine the node displacement data obtained from the finite element analysis to determine the extent to which the quantity is affected by the change of surface shape [1] .It is necessary to combine the node displacement data obtained from the finite element analysis to determine the extent to which the quantity is affected by the change of surface shape.It is necessary to combine the node displacement data obtained from the finite element analysis to determine the extent to which the quantity is affected by the change of surface shape.The amount of data from the finite element analysis of the mirror nodes is usually very large, and Zernike polynomials can also be used effectivelyThe data are compressed and transformed into a set of linear combinations whose coefficients have clear physical meanings.Zernike Polynomial fitting method is the most commonly used method for fitting the surface error of the reflector [2] . The surface error of the mirror refers to the deviation between the ideal surface and the actual surface of the optical mirror, which is an important index to measure the imaging quality of the mirror.At present, the RMS value method and the PV value method are the most commonly used methods to evaluate the surface error of the reflector [3] .…”