Infrared spectrum online rapid identification and analysis method based on sequence forward selection

• Main Authors: LIU WENQING, XU LIANG, LIU JIANGUO, SHEN XIANCHUN
• Format: Patent
• Language: Chinese; English
• Published: 17.09.2021
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention relates to an infrared spectrum online rapid identification and analysis method based on sequence forward selection. The method comprises the following steps of: (A) preprocessing an actually measured spectrum, and preparing a corresponding database; (B) correcting the base line of the actually measured spectrum by adopting an automatic base line correction method; (C) performing variable selection on the spectrum after base line correction by using a sequence forward selection method and an AIC criterion; (D) according to the Lambert-Beer law, performing second screening based on the practical significance that the gas concentration is greater than 0; (E) according to the absorbance spectrum matrix corresponding to the second screening variable set, combining the actual physical significance of the direction included angle between the absorbance matrix and the absorbance spectrum after base line correction, and utilizing a set threshold value to perform third screening; and (F) removing interfe