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本文叙述了用双球法和积分球后面加平行光管的办法测量长焦距物镜杂光系数(VGI)的提案与实验结果。这种配置可以避免已有几种提案的缺点,并且便于同普通的杂光测试装置结合成一体。文中给出的一些实验结果证明这种途径是切实可行的。
This article describes the proposal and experimental results of measuring the stray light index (VGI) of a long focal length objective lens by using the double-sphere method and integrating light behind the integrating sphere. This configuration avoids the drawbacks of several proposals and facilitates integration with common stray light testing devices. Some experimental results given in this paper prove that this approach is feasible.