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　　1、吸收原理近红外水分仪是根据近红外波长会被水分子吸收的原理，分析某特定波长的近红外能量变化。水分子不是静止的：当遇到特定的能量带时，它们会振动。水分子中两个氢原子与氧原子的键会伸展、收缩、或以其它形态扭曲。需要外来的能量引起这些振动，需要的能量遍及整个电磁光谱的特定波段。

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　　2、运行原理水分仪利用的现象是：许多的物质在特定波长下吸收红外能量，而不吸收在其它波长下的红外能量。当测量受测物质的水含量时，最少选择两种波长。一种是为参照波长，不会被受测物质或水强烈吸收。另一种是为测量波长，它不会被受测物质强烈吸收，但会被水强烈吸收。

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