CAJ | 학술논문

基线漂移是光谱检测仪器普遍存在的现象，会对光谱信号的特征提取带来十分不利的影响，而基线校正是解决该问题的重要手段，也是拉曼光谱信号预处理的重要组成部分。基线校正的原理一般是通过拟合基线的方法来去除光谱信号中的基线漂移。传统的基线校正方法是利用多项式拟合的方法对拉曼光谱信号的基线进行拟合的，但是该方法容易出现过拟合和欠拟合现象，且拟合阶数难以确定。针对传统方法的缺点进行了改进，利用B样条方法对拉曼光谱信号的基线进行拟合，发挥B样条低阶光滑的优点，能够有效地克服多项式方法的缺陷。在实验中，利用该方法对孔雀石绿、罗丹明B的拉曼光谱信号进行了基线校正，观察并比较该方法和传统方法的校正结果。实验结果表明，该方法能够有效地消除拉曼光谱信号的基线漂移，在基线漂移较小和较大的位置，可以采用相同的拟合阶数，不会出现欠拟合和过拟合的现象，获得了良好的基线校正效果，为进一步分析光谱数据提供准确可靠的信息。
기선표이시광보검측의기보편존재적현상，회대광보신호적특정제취대래십분불리적영향，이기선교정시해결해문제적중요수단，야시랍만광보신호예처리적중요조성부분。기선교정적원리일반시통과의합기선적방법래거제광보신호중적기선표이。전통적기선교정방법시이용다항식의합적방법대랍만광보신호적기선진행의합적，단시해방법용역출현과의합화흠의합현상，차의합계수난이학정。침대전통방법적결점진행료개진，이용B양조방법대랍만광보신호적기선진행의합，발휘B양조저계광활적우점，능구유효지극복다항식방법적결함。재실험중，이용해방법대공작석록、라단명B적랍만광보신호진행료기선교정，관찰병비교해방법화전통방법적교정결과。실험결과표명，해방법능구유효지소제랍만광보신호적기선표이，재기선표이교소화교대적위치，가이채용상동적의합계수，불회출현흠의합화과의합적현상，획득료량호적기선교정효과，위진일보분석광보수거제공준학가고적신식。
Baseline drift is a widespread phenomenon in modern spectroscopy instrumentation,which would bring a very negative impact to the feature extraction of spectrum signal,and the baseline correction method is an important means to solve the prob-lem,which is also the important part of Raman signal preprocessing.The general principle of baseline drift elimination is using the fitting method to the fit the baseline.The traditional fitting method is polynomial fitting,but this method is prone to over-fitting and under-fitting,and the fitting order is difficult to be determined.In this paper,the traditional method is improved;the B-spline fitting method is used to approach the baseline of Raman signal through constant iteration.The advantages of B-spline, namely low-order and smoothness,can help the method overcome the shortcomings of polynomial method.In the experiments, the Raman signal of malachite green and rhodamine B were detected,and then the proposed method and traditional method were applied to perform baseline correction.Experimental results showed that the proposed method can eliminate the Raman signal baseline drift effectively without over- and under-fitting,and the same order can be used in both positions where large or small baseline drift occurred.Therefore,the proposed method provided more accurate and reliable information for the further analysis of spectral data.