In the second chapter, we analyze the development COD measuring technique and the current instruments, design the new measuring technique of ultraviolet scanning.

第二章分析了当前COD测量技术与仪器的现状与特点，并提出了紫外扫描式多光谱COD测量技术；

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The current types of sand moisture measuring and controlling instruments was briefly introduced, and the development tendency of them was discussed.

简要介绍了目前各类型砂水分测控仪。探讨了型砂水分测控仪的发展趋势。

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The conventional optical measuring instruments wholly based on the designs of optical systems and mechanical structures are unsuitable for the current digital times.

由于传统的光学测量仪器都是基于光学系统和机械结构的设计，在当今的数字化时代，使用十分不便。

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