This paper represents a technique to produce the large size optical aspherical mirror by using reaction-bonded silicon carbide to meet the material requirements of the space used mirrors, based on the characters comparison of all types mirror material. Techniques are described in this paper, including the bonding procedure of silicon carbide to form a mirror shape, the CCOM technology for aspheric grinding, polishing on a home-developed tool –FSGJ-2, and the aspheric profilometry. A specialized Offner Null lens is also developed to measure the aspherical mirror with laser interferometer. With the technology depicted in the paper, a 502mm x 298 mm off-axis SiC aspherical mirror is successfully made with a surface accuracy better than 1/50λrms, the final result meets the design requirement.

A simulation model of coupler based on spatial 7R mechanism is built up by using ADAMS. Kinematics and dynamics of the coupler are analyzed. Further analysis of the coupler stress during the coupler turning is conducted by ANSYS, which provides theoretical foundation for the design of the coupler. The analyzation of the kinematics and dynamics of the coupler by CAE simulation software lays a good foundation for the practical application and further analysis of the coupler.

A model to calculate daily shading factor of flat-plate solar collector array installed on the limited horizontal roofs has been developed. The relations between the latitude, the average daily shading factor, the floor area, and the aspect ratio of the collector array have been deeply studied. The results show that the average daily shading factor on winter solstice day increases with the increase of the latitude and aspect ratio. For a given latitude, the average daily shading factor of a collector array (floor area ≥ 500 m 2) increases linearly with the increase in the aspect ratio within a range of [1/10, 3/1] and increases smoothly with the aspect ratio ranging from 3/1 to 10/1. The average daily shading factors do not exceed 0.085 for the low latitude regions (lat. ≤ 30o N), whereas the maximum average daily shading factors for a 1000m 2 collector array can reach 0.140 when the latitude is close to 40o N.

The Computer Generated Hologram（CGH）technique is the main method for optical testing the free form surface .For testing a convex free form surface mirror, a CGH element with the surface testing, interferometer and free form mirror precise position function was designed by use of appropriative software, the testing precision was less than 0.011λ（λ=632.8nm）in RMS value by this means.

Because of the sic material’s superior optical characteristic, machine characteristic and hot characteristic, it becomes currently the space big aperture reflector choose firstly1. For larger aperture sic mirror, it is not economical and safe to make the monolithic body directly2,3. The SiC mirror brazed assembly with several segments can solve these problems. In this paper, one Φ600 mm sic plane mirror as demonstration welded with 3 radial segments is roughly grinded to the required figure at first, then the mirror is finely grinded and polished by the technology of CCOS, the mirror figure error is less than 1/20λ (λ = 632.8nm) in RMS finally. The problems of the preferential removal near braze joint are solved. The methods of reducing the residual stress of mirror are discussed. At last, some measurements and experiments are carried on, and the results conclude that the brazed SiC mirror can meet the requirement of large aperture optical systems