Spectroscopic Studies on the Natural Leather and Artificial Leather in Terahertz Band
LONG Sha1, ZHANG Hua2, SONG Zhe-yu2, 3, YAN Shi-han2*, CUI Hong-liang2, 4
1. Chongqing Municipal Fiber Inspection Bureau, Chongqing 401121, China
2. Chongqing Engineering Research Center of High-Resolution and Three-Dimensional Dynamic Imaging Technology, Research Center for Applied Physics, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
3. School of Optoelectronic Engineering, Changchun University of Science and Technology, Changchun 130022, China
4. College of Instrumentation & Electrical Engineering, Jilin University, Changchun 130061, China
Abstract：A huge demand and supply gap existed in the market about leather identification. The nondestructive detection method of different kinds of leather, especially different kinds of natural leather, has important application value. The terahertz (THz) transmission spectra of different kinds of natural leather and artificial leather have been systematically investigated and compared by THz time-domain spectroscopy (THz-TDS). In the range of 0.2 to 1.5 THz, the THz absorption coefficient and refractive index of natural leather are generally greater than those of artificial leather, and those of reptile leather, fish leather and mammal leather gradually decreased. There existed a turning point at about 60 ℃ in the amplitude change of THz time-domain spectroscopic curve during the heating process of natural leather from 25 to 80 ℃ with different variation tendency to pigskin, cowhide and sheepskin respectively, while it is absent to artificial leather. Further, the THz spectrum feathers of major components of leather, collagen, Polyvinyl chloride (PVC) and Polyurethane (PU) have been characterized to verify the cause of the difference of leather THz spectrum. The THz absorption coefficient and refractive index of collagen are greater than those of PVC and PU. The inflection point appears to collagen, but not to PVC during the same heating process. The characteristics of the THz spectrum of the composition of leather, collagen, PVC and PU have the similar numerical trends and changes, which indicates that the difference of the THz spectrum between different kinds of leather is mainly due to the difference in its composition. The work illustrates that the THz-TDS could be used to label-free distinguish artificial leather from natural leather and differentiate varieties of natural leathers from reptiles, mammals and fish.
Key words：Terahertz; Leather; Absorption coefficient; Refractive index
龙 莎，张 华，宋哲宇，颜识涵，崔洪亮. 真皮革和人工革在太赫兹波段的光谱研究[J]. 光谱学与光谱分析, 2019, 39(04): 1030-1035.
LONG Sha, ZHANG Hua, SONG Zhe-yu, YAN Shi-han, CUI Hong-liang. Spectroscopic Studies on the Natural Leather and Artificial Leather in Terahertz Band. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2019, 39(04): 1030-1035.
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