Abstract: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