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DLP NIRscan 光谱仪偶然有一条光谱在某个点会出现一个凹槽

Other Parts Discussed in Thread: DLP2010NIR

你好!我用DLP2010NIR做了一款近红外的光谱仪,但采集时发现偶然有一条光谱在某个点会出现一个凹槽,如下图,请问这是什么原因造成的呢?谢谢!