Kalman滤波技术校正电感耦合等离子体原子发射光谱分析中严重重叠的谱线干扰

针对ICP-AES中严重重叠谱线干扰的校正, 研究了若干因素对Kalman滤波器性能的影响。减小扫描步长可以增强Kalman滤波法解析重叠谱线的能力。当重叠线轮廓基本相同且扫描窗口内干扰元素只有一条谱线时, Kalman滤波法能分辨的重叠线对的最小峰间距为扫描步长的2～3倍。扫描窗口内较多的干扰元素谱线和重叠线对轮廓的显著差异有利于Kalman滤波器正确识别分析信号和干扰信号, 可以利用这两个因素有效地分辨峰间距很小甚至完全重叠的谱线。

Resolution of closely spaced lines with kalman filtering in inductively coupled plasma atomic emission spectrometry

Effects of some factors on the performance of a Kalman filter in discrimination of closely spaced overlapping signals were investigated. The resoln. power of the filter for overlapping lines can be strengthened by reduction of the step size in scans. The min. peak separation of two lines generally equals two to three times the step size in scans. Significant difference between the profiles of the anal. and interfering lines and multiple lines from matrix in the spectral window of the anal. line are very helpful for the Kalman filter to discern closely spaced anal. and interfering signals correctly, which allow the filter to resolve the line pair with very small peak distance or even the entirely coincident lines.1