不同地区及仿真和田玉太赫兹光谱分析

利用太赫兹时域光谱技术对不同地区和田玉及其仿真品进行测量与分析,为不同地区的和田玉及真伪鉴别提供技术支撑。实验选取了新疆、韩国和青海三个不同产地的和田玉样品,同时选取了三种仿和田玉样品,在0.1~2.5THz频段进行太赫兹光谱数据采集。不同地区和田玉在太赫兹频段具有不同的特征吸收峰,并且每个样品在相对高频和低频的吸收量不同,随频率的增加,样品在相对低频处的折射率呈增加趋势,在高频处呈缓慢下降趋势,不同样品的变化趋势不同。仿真样品与和田玉在0.1~2.5 THz波段的吸收系数、折射率、相对介电常数相差很大。实验结果初步表明,用太赫兹波段的吸收系数和折射率来鉴别和田玉及仿真品是可行的,能够区分不同地区和田玉及仿真样品,该方法快速、便捷,能为市场监管提供有力技术支撑。

Terahertz spectrum analysis of Hetian jade from different area and the simulation products

Hetian Jade from different areas and its simulation products were measured and analyzed by Terahertz time-domain spectroscopy, which could provide technical support for their identification. Three samples of Hetian jade from Xinjiang, South Korea and Qinghai were selected and three kinds of simulated Hetian jade samples were simultaneously selected. Terahertz spectrum data were collected from 0.1 to 2.5Thz frequency band. The Hetian jade from different areas have different characteristic absorption peaks in terahertz band, and the absorption amount of each sample is different in the relative high frequency and low frequency. The refractive index of the sample increases in the relative low frequency, and decreases slowly in the high frequency with the increase of frequency. The change trend of different samples is different. The absorption coefficient, refractive index and relative permittivity of the simulated sample and Hotan jade are highly different from 0.1 to 2.5 THz band. The experimental results preliminarily show that it is feasible to identify Hetian jade and its simulations by using the absorption coefficient and refractive index of terahertz band, which can distinguish Hetian jade and its imitations from different regions. This method is fast and convenient, and can provide strong technical support for market supervision