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数据平滑和扫描步长是两个重要求导条件。本工作用五点三次多项式平滑技术对扫描数据进行平滑处理以消除随机噪音,但平滑次数增大会导致信号失真从而使导数光谱的分辨能力降低。扫描步长减小能提高导数光谱的分辨能力,但同时导致导数光谱灵敏度减小。导数光谱中干扰物等效浓度IEC的大小是上述因素的综合反映。本文以IEC为考察指标,讨论了平滑次数和扫描步长的优化。
Data smoothing and scanning steps are two important derivations. In this work, the smoothed scan data is smoothed by a polynomial smoothening technique, which is used to eliminate random noise. However, the increase of the smoothening frequency will lead to distortion of the signal and the resolving power of the derivative spectrum will be reduced. The decrease of scanning step can improve the resolving power of the derivative spectrum, but at the same time it leads to the decrease of the sensitivity of the derivative spectrum. The magnitude of the IEC equivalent in the derivative spectrum is a comprehensive reflection of the above factors. In this paper, IEC as the inspection index, the optimization of smoothing times and scanning steps are discussed.