Silicosis is a disabling respiratory disease caused by inhaling silica dust, which is used in the production of glass products, optical fibers, cement, and more.
This paper investigates the design theories and methods ir applying the single and dual cement aplanats in the optical system used in surveying and metrology.
本文研究单不晕镜和双胶不晕镜用于测绘与计量光学系统的设计理论和方法。
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J-646, a new optical photosensitive cement is characterized by good transmissivity, small shrinkage, moderate strength, good ageing resistance, less toxicity and low cost.