基于太赫兹时域光谱技术的水蒸汽传输特性研究
发布时间：2019-05-20 00:56
【摘要】：太赫兹波是指频率范围为0.1-10THz的电磁波。太赫兹的特殊性质使其在生物医学、无损探伤、安全检测和移动通信等领域都有着广阔的应用前景。尤其在移动通信领域越来越受到世界各国的重视和青睐。随着人们对数据传输速率的要求越来越高,发展更高频率的载波是满足大数据传输的必然趋势。然而太赫兹辐射在通信、雷达这些数据传输方面的应用与THz的大气传输特性紧密相关。大气对THz的吸收衰减效应以水分子的吸收作用最强。所以研究THz在水蒸汽中的传输效应是确定THz的大气窗口位置和宽度的重要依据。本实验搭建基于太赫兹时域光谱技术的透射式THz-TDS系统为实验平台,调整THz传输行程为0.5m,1m,2m,3m和密闭环境湿度范围在0到80%。采用等效时间取样原理重构太赫兹时域波形,以Lab View开发的软件采集和存储实验数据。数据处理过程首先需要对时域信号经过傅里叶变换,在频域上提取振幅和相位信息。最后采用L.Duvillaret和T.D.Dorney等人提出的提取材料光学参数的经典理论计算THz在不同湿度和不同传输行程下的吸收系数和透射率等参数。通过本实验大量数据分析得到如下结论,随着空气湿度的升高,太赫兹时域光谱峰值逐渐降低,各窗口的传输率降低,传输窗口被压缩。随着水蒸汽太赫兹传输行程的增加,各窗口的传输率逐渐降低,传输窗口被压缩。
[Abstract]:Terahertz wave refers to electromagnetic wave with frequency range of 0.1-10THz. The special properties of terahertz make it have broad application prospects in biomedicine, nondestructive testing, security testing and mobile communication. Especially in the field of mobile communication, it has been paid more and more attention and favored by all countries in the world. With the higher and higher requirements of data transmission rate, the development of higher frequency carrier is to meet the inevitable trend of big data transmission. However, the application of terahertz radiation in communication and radar data transmission is closely related to the atmospheric transmission characteristics of THz. The absorption and attenuation effect of THz by atmosphere is the strongest among water molecules. Therefore, the study of the transport effect of THz in steam is an important basis for determining the position and width of the atmospheric window of THz. In this experiment, a transmission THz-TDS system based on terahertz time domain spectroscopy is built as the experimental platform. The transmission stroke of THz is adjusted to 0.5m, 1m, 2m, 3m and the humidity range of closed environment is 0 to 80%. The terahertz time domain waveform is reconstructed by equivalent time sampling principle, and the experimental data are collected and stored with the software developed by Lab View. In the process of data processing, it is necessary to extract amplitude and phase information in frequency domain by Fourier transform of time domain signal. Finally, the classical theory of extracting optical parameters of materials proposed by L.Duvillaret and T.D.Dorney et al is used to calculate the absorption coefficient and transmittance of THz under different humidity and different transmission paths. Through the analysis of a large number of data in this experiment, it is concluded that with the increase of air humidity, the peak value of terahertz time domain spectrum decreases gradually, the transmission rate of each window decreases, and the transmission window is compressed. With the increase of steam terahertz transmission stroke, the transmission rate of each window decreases gradually, and the transmission window is compressed.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN011
本文编号：2481220
[Abstract]:Terahertz wave refers to electromagnetic wave with frequency range of 0.1-10THz. The special properties of terahertz make it have broad application prospects in biomedicine, nondestructive testing, security testing and mobile communication. Especially in the field of mobile communication, it has been paid more and more attention and favored by all countries in the world. With the higher and higher requirements of data transmission rate, the development of higher frequency carrier is to meet the inevitable trend of big data transmission. However, the application of terahertz radiation in communication and radar data transmission is closely related to the atmospheric transmission characteristics of THz. The absorption and attenuation effect of THz by atmosphere is the strongest among water molecules. Therefore, the study of the transport effect of THz in steam is an important basis for determining the position and width of the atmospheric window of THz. In this experiment, a transmission THz-TDS system based on terahertz time domain spectroscopy is built as the experimental platform. The transmission stroke of THz is adjusted to 0.5m, 1m, 2m, 3m and the humidity range of closed environment is 0 to 80%. The terahertz time domain waveform is reconstructed by equivalent time sampling principle, and the experimental data are collected and stored with the software developed by Lab View. In the process of data processing, it is necessary to extract amplitude and phase information in frequency domain by Fourier transform of time domain signal. Finally, the classical theory of extracting optical parameters of materials proposed by L.Duvillaret and T.D.Dorney et al is used to calculate the absorption coefficient and transmittance of THz under different humidity and different transmission paths. Through the analysis of a large number of data in this experiment, it is concluded that with the increase of air humidity, the peak value of terahertz time domain spectrum decreases gradually, the transmission rate of each window decreases, and the transmission window is compressed. With the increase of steam terahertz transmission stroke, the transmission rate of each window decreases gradually, and the transmission window is compressed.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN011
【参考文献】
相关硕士学位论文 前1条
1 许祖兵;激光大气传输特性分析研究[D];南京理工大学;2006年
，本文编号：2481220
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