Raman spectrum baseline piecewise polynomial fitting method based on sliding window

• Main Authors: WU BIWEI, MA JIE, TAN JIUBIN, WANG WEIBO
• Format: Patent
• Language: Chinese; English
• Published: 25.06.2024
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTEDFOR SPECIFIC APPLICATION FIELDS; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention relates to a Raman spectrum baseline piecewise polynomial fitting method based on a sliding window, and belongs to the technical field of spectral analysis. According to the method, typical Raman spectrum peaks which change severely compared with a baseline are obtained through preliminary polynomial fitting, sliding window adaptive width selection is achieved on the basis of the distance between the end point of a sliding window and the peak value position of each typical Raman spectrum peak, an original spectrum is divided into small sections from left to right to be subjected to baseline fitting in sequence, and the baseline fitting result is obtained. According to the method, the phenomena of over-fitting and under-fitting easily occurring in a classical polynomial fitting method are effectively avoided, the accuracy of Raman spectrum line extraction is improved, meanwhile, the number of iterations required by baseline fitting and the order of a fitting polynomial are reduced, and the baseli