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为了实现大口径望远系统中主次镜系统的装调,并提高光学成像质量,采用了一种调整主次镜相对位置的新方法高精度光学定心法。该方法不同于传统的修切垫圈调整法,可同时消除主次镜系统中因次镜相对主镜的倾斜引起的像散及因次镜偏心引起的彗差,不仅大大降低了装调难度,而且消除了系统的不稳定性。另外,通过干涉自准检验和十字丝代替光轴相结合的办法,建立了一套新的主次镜系统的检验方案。通过对主镜口径为Φ520mm的R-C系统的实际装调和检验表明,组合前后主、次镜两组件的面形波像差均方根值(RMS)均小于等于0.03λ(λ=632.8nm),主次镜光轴角晃动量分别为0.72″、2″,两个镜子的光轴与其各自镜框端面的垂直度均小于等于0.005mm,主次镜系统同心度小于等于0.01mm,满足系统面形波像差均方根值小于等于0.07λ的设计要求。
In order to realize the installation of primary and secondary mirror systems in large-aperture telephoto system and improve the optical imaging quality, a new method of adjusting the relative position of the primary and secondary mirrors is proposed. The method is different from the traditional method of adjusting a washer and is capable of eliminating astigmatism caused by the tilting of the secondary mirror relative to the primary mirror and the coma caused by the secondary mirror eccentricity in the primary and secondary mirror systems not only greatly reducing the difficulty of assembly and adjustment, And eliminates the system instability. In addition, a new set of inspection schemes of principal and minor mirror system was established by the combination of interference self-pretesting and the replacement of optical axis by cross-hair. The actual installation and inspection of the RC system with the primary mirror diameter of Φ520mm showed that the RMS of the surface wave aberration before and after the combination was less than or equal to 0.03λ (λ = 632.8nm) The primary and secondary mirror optical axis sway were 0.72 “, 2”, the two mirrors and their respective end frame of the optical axis perpendicularity is less than or equal to 0.005mm, primary and secondary mirror system concentricity less than or equal to 0.01mm, to meet the system surface shape Wave root mean square value less than or equal to 0.07λ design requirements.