Electronic Information Engineering, Xi'an Technological University, Xi'an 710021, China.
State Key Laboratory of Electrical Insulation & Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China.
Molecules. 2022 Jul 3;27(13):4287. doi: 10.3390/molecules27134287.
The spectrum scanned by a Fourier transform spectrometer (FTIR) often has a baseline drift. However, baseline distortion rarely occurs in a laboratory owing to the insignificant effects of environmental vibrations and electromagnetic factors. Even if it occurs, the distorted spectrum can be manually eliminated. However, in a complex environment, especially after the long-term operation of a spectrometer, the scanned spectrum may be distorted to different degrees. Herein, the origins of spectral baseline drifts and distortions are analyzed and simulated using MATLAB; furthermore, a baseline correction method based on the baseline-type model is proposed. The results of experiments performed on the methane spectrum confirm that the proposed method outperformed the improved modified multi-polynomial fitting and iterative averaging methods.
傅里叶变换光谱仪（FTIR）扫描的光谱通常存在基线漂移。然而，由于环境振动和电磁因素的影响较小，实验室中很少出现基线扭曲。即使发生这种情况，也可以手动消除扭曲的光谱。但是，在复杂的环境中，特别是在光谱仪长期运行之后，扫描的光谱可能会发生不同程度的扭曲。在此，使用 MATLAB 对光谱基线漂移和扭曲的原因进行了分析和模拟；此外，还提出了一种基于基线类型模型的基线校正方法。对甲烷光谱进行实验的结果证实，该方法优于改进的修正多项式拟合和迭代平均方法。
