关键词：Extracting absorption spectrum in THz band is one of the important aspects in THz applications. Sample’s absorption coefficient has a complex nonlinear relationship with its thickness. However;as it is not convenient to measure the thickness directly;absorption spectrum is usually determined incorrectly. Based on the method proposed by Duvillaret which was used to precisely determine the thickness of LiNbO3;the approach to measuring the absorption coefficient spectra of glutamine and histidine in frequency range from 0.3 to 2.6 THz(1 THz=1012 Hz) was improved in this paper. In order to validate the correctness of this absorption spectrum;we designed a series of experiments to compare the linearity of absorption coefficient belonging to one kind amino acid in different concentrations. The results indicate that as agreed by Lambert-Beer’s Law;absorption coefficient spectrum of amino acid from the improved algorithm performs better linearity with its concentration than that from the common algorithm;which can be the basis of quantitative analysis in further researches.
李 智，张朝晖*，赵小燕，苏海霞，燕 芳. 基于样片厚度精确估计的THz吸收系数谱算法[J]. 光谱学与光谱分析, 2012, 32(04): 1043-1046.
LI Zhi, ZHANG Zhao-hui*, ZHAO Xiao-yan, SU Hai-xia, YAN Fang. Extracting THz Absorption Coefficient Spectrum Based on Accurate Determination of Sample Thickness. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2012, 32(04): 1043-1046.
