The main feature of the compound diffractive telescope is the combination of diffractive optics with compound structure
arranged eyepieces. In this paper, a design of the compound diffractive telescope is firstly introduced, and a 4.2° FOV
is obtained with one primary lens and twenty-one eyepieces. Secondly, image characteristic of different channels is
analyzed with the design wavelength in ASAP, and one modified phase function model of diffractive optical element is
introduced to analyze the MTF curves for 0° FOV, which provides a more accurate prediction of the performance of the
system. Then the system is tested by the star image test, and the diffraction limit images are got within ± 2° FOV. And
finally, two pictures taken from the adjacent FOV proved to be able to be spliced together. All the results above
demonstrate that a good performance of the compound diffractive telescope.
In the solar tower thermal power generation system, the precision of the slope angle of the heliostat is the major factor,
which influences the efficiency of the system, consequently, this angle should be tested accurately. In this paper, the
methods based on laser deflectometry are proposed to measure the shape error of the mirror facet and the connected error
of the facets; such apparatus and corresponding software packages are developed. With the help of these two apparatus,
the heliostat of 100<sup>2</sup>, consisting of 55 mirror facets of 1.8182 m<sup>2</sup>; (hexagon), for the 1MWe solar tower power plant in Beijing are measured and connected successfully.