Abstract：Using THz-TDS to detect the THz temporal pulse and calculate the absorption spectrum of the sample is the main access to qualitative and quantitative analysis. The shape and the amplitude of the THz absorption spectra are not only related to the sample, but also closely related to the length of the chosen THz pulse in the calculation, which was discovered in our experiments. It is the main cause of this problem that the flaky sample reflects the THz wave many times, which will give rise to the Fabry-Perot effect. So the sample-probing temporal signal is divided into the intrinsic section with the sample’s information directly, low SNR noise section, and unwanted Fabry-Perot reflections section with the overlapped information. Based on THz pulse generation mechanism and the relationship between the pulse amplitude and the attenuate process, a model of intercepting the intrinsic section in terahertz time-domain pulse was proposed and was proved reliable and stable by the results from experiments performed with amino acids: glutamine(Gln), histidine(His), and cystine(Cys).
Key words：Terahertz temporal pulse;Fabry-Perot effect;Length of pulse sequence;Intrinsic section
苏海霞, 张朝晖*, 赵小燕, 李 智, 燕 芳, 张 寒 . THz-TDS测试中时域脉冲的本质段及其截取模型 [J]. 光谱学与光谱分析, 2013, 33(04): 921-925.
SU Hai-xia, ZHANG Zhao-hui*, ZHAO Xiao-yan, LI Zhi, YAN Fang, ZHANG Han . Intrinsic Section and Its Interception Model for Temporal Pulse of THz-TDS . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2013, 33(04): 921-925.
