The reflector is influenced by force and temperature more and more seriously with the increasing of reflector diameter.
The error analysis and adjustment of reflector is important to satisfy the optical performance. In fact, the error of the
reflector include figure error, position error and curvature radius error, which are often coupled and difficult to adjust.
The method of the separation of the three type errors and way of adjustment are studied in this paper. The separation of
the error is following the belows: first, the deformation of the nods on the reflector surface are analyzed and transfered to
sag deformation; second, the position error is obtained by the least-square method and adjusted; third, the residual error
is fit with the Zernike polynomial and the curvature radius error is acquired and adjusted, at last; the remained error is the
high-frequency figure error.
A reflector under the load of heat is simulated and analyzed in this paper with the method above. The results indicate that
the error of piston and curvature radius are the major errors, so it is possible to adjust the error of piston and curvature
radius alone to improve the quality of reflector in optical system, in order to simplify the mount system of the reflector.