Abstract：In the present paper, a new correction method of baseline drift of discrete spectrum is proposed by combination of cubic spline interpolation and first order derivative. A fitting spectrum is constructed by cubic spline interpolation, using the datum in discrete spectrum as interpolation nodes. The fitting spectrum is differentiable. First order derivative is applied to the fitting spectrum to calculate derivative spectrum. The spectral wavelengths which are the same as the original discrete spectrum were taken out from the derivative spectrum to constitute the first derivative spectra of the discrete spectra, thereby to correct the baseline drift of the discrete spectra. The effects of the new method were demonstrated by comparison of the performances of multivariate models built using original spectra, direct differential spectra and the spectra pretreated by the new method. The results show that negative effects on the performance of multivariate model caused by baseline drift of discrete spectra can be effectively eliminated by the new method.
Key words：Discrete spectrum;Baseline correction;Cubic spline interpolation;First order derivative
胡爱琴，袁洪福*，宋春风，李效玉 . 近红外离散波长光谱基线漂移校正方法研究 [J]. 光谱学与光谱分析, 2014, 34(10): 2606-2611.
HU Ai-qin, YUAN Hong-fu*, SONG Chun-feng, LI Xiao-yu . A Correction Method of Baseline Drift of Discrete Spectrum of NIR . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2014, 34(10): 2606-2611.
