The analysis is given in detail about the influence of several parameters of the surface error of optical elements including magnitude, type, scale size and distribution on the beam quality.
定量分析了了光学面形误差各参数(幅度、类型、空间尺度和空间分布等)对光束质量的影响。
Beam string structures are a new type of space structure, which composed of strings, struts and moment-resistant elements such as beams and, arches.
张弦梁结构是由弦、撑杆和抗弯受压构件组合而成的新型结构体系，是通过在弦中施加预应力来改善抗弯受压构件受力性能的自平衡体系。
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