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利用正交投影方法以及原始信号及其投影与背景矢量之间的线性关系，确定背景光谱，从而将待测组分的红外光谱从混合物光谱中提取出来，达到扣除背景及分辨重叠光谱之目的。本方法用于二氯乙烷及丙酮中各组分红外光谱的提取，获得了满意的结果
Using the orthogonal projection method and the linear relationship between the original signal and its projection and the background vector, the background spectrum is determined, so that the infrared spectrum of the component to be detected is extracted from the mixture spectrum to deduct the background and distinguish the overlapping spectrum. The method is applied to the extraction of infrared spectra of the components in dichloroethane and acetone and obtains satisfactory results