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测绘仪器在生产、使用和存放中，除了有生霉现象外，光学零件起雾，对测绘仪器的危害也很大。雾是指光学零件的抛光面上，呈现出“露水”似的物质，这些物质有的是由油质点子构成的，称为油性雾；有的是由水珠或水与玻璃起化学反应形成的堆积物构成的，称为水性雾；有的光学零件上，两种雾都有，叫水油混合雾。一般的都以“露水”状或干的堆积物存在于玻璃表面上。
Surveying and mapping equipment in the production, use and storage, in addition to mildew phenomenon, the fog of optical parts, mapping equipment is also a great harm. Fog refers to the polished surface of optical components, showing a “dew” like substances, some of these substances are composed of oil-based particles, known as oily fog; some by water droplets or water and glass from the formation of the reaction of the formation of sediment , Known as water-based fog; some optical components, both fog, water and oil mixed fog. Generally, “dew” or dry deposits exist on the glass surface.