High Precision Detection of SBS Modifier Content Based on Split Band and Three-Dimensional Infrared Spectroscopy Analysis

In order to detect the content of SBS modifier in SBS modified asphalt with high precision, the principle of image analysis based on near infrared spectroscopy was deeply analyzed, and the infrared spectrum analysis method of three-dimensional analytical method was proposed. The results show that: (1) the peak position of absorbance at wave number 967 cm⁻¹ is the characteristic peak position of SBS modifier different from other substances in modified asphalt; (2) the content of SBS modifier can be detected by calculating the absorbance peak area at 967 cm⁻¹ wave number position; and (3) compared with the traditional two-dimensional analytical method of infrared spectrogram, the proposed three-dimensional analytical method of infrared spectrogram with sub-band has only 0.09% deviation from the true value, and the detection accuracy has been improved by 15%.