| 光谱学与光谱分析 |
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| The Lambert-Beer’s Law Characterization of Formal Analysis in Terahertz Spectrum Quantitative Testing |
| SU Hai-xia, ZHANG Zhao-hui, ZHAO Xiao-yan*, LI Zhi, YAN Fang, ZHANG Han |
| Department of Instrumentation Science, University of Science & Technology Beijing, Beijing 100083, China |
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Abstract The present paper discusses the Lambert-Beer’s law application in the terahertz spectrum, studies the single amino acid tablet sample (glutamine) and two kinds of amino acids mixture tablet (threonine and cystine) under the condition of different concentrations. Absorbance and absorption coefficient was analyzed in the description of the terahertz optical properties of matter. By comparing absorption coefficient and absorbance value of the single component in the vicinity of 1.72 THz, we verified the material under two kinds of absorption characterization of quantity of THz wave absorption along with the change in the concentration. Using the index of goodness of fit R2, it studied the stand or fall of linear relationship between the terahertz absorption quantity of material and concentration under two kinds of representation. This paper analyzes the two components mixture under two kinds of absorption characterization of quantity of terahertz absorption in 0.3～2.6 THz. Using the similarity coefficient and the estimate concentration error as evaluation index, it has been clear that the absorbance of additivity instead of the absorption coefficient should be used during the terahertz spectrum quantitative test, and the Lambert-Beer’s law application in the terahertz wave band was further clarified.
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Received: 2013-08-15
Accepted: 2013-10-15
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Corresponding Authors:
ZHAO Xiao-yan
E-mail: zhaoxiaoyan@ustb.edu.cn
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