太赫兹傅里叶变换光谱技术及其应用研究

发布时间：2018-05-06 16:17

本文选题：太赫兹 + 远红外　；参考：《电子科技大学》2016年硕士论文

【摘要】：太赫兹辐射指的是频率在微波和红外之间的电磁波,通常定义包含0.1THz至30THz之间的频谱区域,与远红外频谱重合。太赫兹频谱区域聚集了很多频谱特征,不同物质在太赫兹频段特性的显著差别,使太赫兹技术在无损检测、医学药品试验以及生物化学分子结构分析等领域有广大的应用前景。太赫兹光谱技术是太赫兹技术的重要分支。目前太赫兹光谱技术主要使用太赫兹时域光谱仪进行研究,其局限性在于可测频带窄,低于3THz。本文采用Sciencetech公司生产的远红外傅里叶变换光谱仪进行实验,将分析的频谱范围扩展到3THz至33THz。此外,太赫兹傅里叶变换光谱技术(THz-FTS)还具有灵敏度高、频率准确、宽带宽、重复性好的优点。本文的工作内容如下:1)本文研究了太赫兹傅里叶变换光谱仪实验系统,理解其工作原理,对其各组成部件进行详细研究。并介绍了傅里叶变换光谱仪的光路调试、实验操作方法。2)本文从理论出发,详细介绍了从太赫兹傅里叶变换光谱中提取材料参数的方法,在数据处理方法方面做了大量研究。3)本文利用太赫兹傅里叶变换光谱仪对组成蛋白质的20种氨基酸进行了透射测量,获得其太赫兹特征吸收谱。并且利用Gaussian对着8种人体必须的氨基酸进行分子建模计算。结果表明,理论计算光谱获得振动峰位置与实验所得光谱特征峰一致性较好。因此,太赫兹傅里叶变换光谱可以作为太赫兹光谱研究的一项有效手段。
[Abstract]:Terahertz radiation (THz) refers to the electromagnetic wave between microwave and infrared, usually defined as the spectrum region between 0.1THz and 30THz, which coincides with the far-infrared spectrum. The terahertz spectrum region has a lot of spectral characteristics. The significant difference of the characteristics of different substances in the terahertz band makes terahertz technology have a broad application prospect in the fields of nondestructive testing, medical drug testing and biochemical molecular structure analysis. Terahertz spectroscopy is an important branch of terahertz technology. At present, terahertz spectroscopy is mainly studied by terahertz time-domain spectrometer. Its limitation is that the measurable band is narrower than 3THz. In this paper, the far-infrared Fourier transform spectrometer produced by Sciencetech Company is used to carry out the experiment, and the spectrum range of the analysis is extended to 3THz to 33THZ. In addition, THz Fourier transform spectroscopy (THz FTS) has the advantages of high sensitivity, accurate frequency, wide bandwidth and good repeatability. In this paper, the experimental system of terahertz Fourier transform spectrometer is studied, its working principle is understood, and its components are studied in detail. In this paper, the method of extracting material parameters from terahertz Fourier transform spectrum is introduced in detail, based on the theory. In this paper, THz Fourier transform spectrometer is used to measure the 20 amino acids that make up the protein, and the terahertz characteristic absorption spectrum is obtained. Gaussian was used to model and calculate 8 kinds of essential amino acids. The results show that the position of the vibration peak obtained by the theoretical calculation is in good agreement with the experimental characteristic peak. Therefore, terahertz Fourier transform spectroscopy can be used as an effective means for the study of terahertz spectroscopy.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TH744.1

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