Chen Long-wang, Meng Kuo, Zhang Yan
Department of Physics, Capital Normal University, Beijing Key Lab for Terahertz Spectroscopy and Imaging, Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing 100048, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2009 May;29(5):1168-71.
With the development of ultrafast laser technique and deeper understanding of the terahertz (THz)electromagnetic wave, THz time domain spectroscopy (THz-TDS)has become a novel and rapidly developed technique. It has been applied in many fields such as biomedical diagnostics, semiconductor wafer diagnostics, and inspection of artwork However, the achieved spectrum will exhibit strong oscillations when it is measured in air environment due to the absorption of water vapor. In the present paper, spectra in the range of 0.2-1.9 THz for seven kinds of samples were measured by THz-TDs in both nitrogen and air environment. The wavelet transform was used to process the data measured in the air environment to eliminate the influence of water vapor. The feasibility of this method was demonstrated by the experimental results.
随着超快激光技术的发展以及对太赫兹（THz）电磁波的深入理解，太赫兹时域光谱技术（THz-TDS）已成为一种新兴且快速发展的技术。它已被应用于许多领域，如生物医学诊断、半导体晶圆诊断以及艺术品检测等。然而，当在空气环境中进行测量时，由于水蒸气的吸收，所获得的光谱会呈现出强烈的振荡。在本文中，利用太赫兹时域光谱技术（THz-TDS）在氮气和空气环境中对七种样品在0.2 - 1.9太赫兹范围内的光谱进行了测量。采用小波变换对在空气环境中测量的数据进行处理，以消除水蒸气的影响。实验结果证明了该方法的可行性。
