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大口径轻质反射镜的重力环境下高精度检测是目前的一个难点,由于其轻量化程度高,绝对刚度低,在重力环境下,支撑形式的不同对光学检测结果影响巨大。提出了一种以提供提拉牵引力的方法实现光轴水平支撑测试的解决方案,通过一系列的滑轮组的自适应调整,获得预定义的力学支撑,实现轻质反射镜光轴水平状态重力环境下的高精度面形测试。有限元力学分析结果表明,依据本方法开展的光轴水平状态检测,能够有效减少重力引起的光轴竖直和光轴水平两种状态下的面形变化RMS值差异,其差异值小于0.003λ(λ=632.8 nm)。文中所提出的方法具有良好的可实施性,它可推广应用到其他大口径轻质反射镜的检测支撑的设计中,为此类大口径相机的研制提供技术基础。
Due to its high light weight and low absolute stiffness, the different support forms have a great influence on the optical inspection results under the gravity environment. A solution to the horizontal support test of optical axis was proposed to provide the pulling force of traction. Through a series of adaptive adjustment of the pulley block, the pre-defined mechanical support was obtained, and the optical axis of the lightweight reflector was realized under the gravity environment High-precision surface test. The results of finite element analysis show that the detection of optical axis horizontal state based on this method can effectively reduce the difference of RMS values of surface shape under the condition of optical vertical axis and optical axis caused by gravity and the difference is less than 0.003λ λ = 632.8 nm). The method proposed in this paper has good implementability, which can be widely applied to the design of the detection support of other large-diameter light-reflecting mirrors and provide the technical foundation for the development of such large-aperture cameras.