太赫兹时域光谱成像系统构建及应用研究

发布时间：2018-04-29 15:48

本文选题：太赫兹时域光谱成像系统 + 扫描成像　；参考：《西南科技大学》2017年硕士论文

【摘要】：太赫兹时域光谱成像的研究始于二十世纪九十年代,构成了太赫兹波应用的主要关键技术,具有巨大的研究和应用价值。常用的太赫兹成像方式有连续波成像、扫描成像、CCD实时成像和近场成像等。本研究课题以太赫兹时域光谱成像系统为主要研究方向,首先从性能参数上对几种常见的成像方式进行对比,选出性能相对良好的扫描成像方式进行系统构建。然后,根据太赫兹时域光谱系统的功能需求编写Lab VIEW软件程序。最后,利用扫描成像系统进行隐蔽物和含能材料的应用研究。具体研究工作包括:(1)构建太赫兹时域光谱二维扫描成像系统,根据工作原理和元件性能,并按照光学平台的搭建方法,进行光路的设计和搭建。太赫兹时域光谱成像系统主要由钛宝石锁模飞秒激光器、时间延迟平移台、两轴平移台、太赫兹辐射产生装置、太赫兹探测装置和锁相放大器等设备装置构成。对构建完成的系统进行调试和分析,使其达到较高的性能。(2)根据太赫兹时域光谱扫描成像系统的功能需求,进行Lab VIEW软件的模块化程序编写,包括参数设置、运动控制、波形和图像显示、数据采集、数据保存、数据处理和离线数据调用等功能模块。了解所需虚拟仪器的性能和指令,掌握相关的理论知识,主要有相干检测原理、快速傅里叶变换原理、时域光谱数据处理理论和相位修正算法。从时域和频域两大方面对数据进行处理,并分别得到这两方面的波形和图像的显示。(3)利用太赫兹时域光谱扫描成像系统对隐蔽物进行成像,分析系统成像的结果,从噪声处理、分辨率增强、边缘检测等方面,利用Matlab软件对成像结果进行图像处理,进而分析系统的分辨率。然后再对含能材料进行成像研究,得到含能材料在时域和频域上的数据、波形和图像,从而对四种含能材料进行分辨。
[Abstract]:The study of terahertz time-domain spectral imaging began in the 1990s. It constitutes the main key technology of terahertz wave application and has great research and application value. The conventional terahertz imaging methods include continuous wave imaging, scanning imaging, CCD real-time imaging and near-field imaging. In this paper, THz time-domain spectral imaging system is taken as the main research direction. Firstly, several common imaging methods are compared in terms of performance parameters, and the scanning imaging method with relatively good performance is selected to construct the system. Then, according to the functional requirements of terahertz time domain spectrum system, the Lab VIEW software program is written. Finally, a scanning imaging system is used to study the applications of concealed and energetic materials. The specific research work includes the construction of THz time-domain spectrum two-dimensional scanning imaging system. The optical path is designed and constructed according to the working principle and the performance of the components, and according to the method of building the optical platform. Terahertz time-domain spectral imaging system is mainly composed of Ti gem mode-locked femtosecond laser, time-delay translation table, two-axis translation table, terahertz radiation generator, terahertz detector and phase-locked amplifier. According to the functional requirements of THz time-domain spectral scanning imaging system, the modularization program of Lab VIEW software is compiled, including parameter setting, motion control, and so on. Waveform and image display, data acquisition, data saving, data processing and offline data transfer and other functional modules. To understand the performance and instruction of the virtual instrument and to master the relevant theoretical knowledge, there are coherence detection principle, fast Fourier transform principle, time-domain spectral data processing theory and phase correction algorithm. The data are processed from the time domain and the frequency domain, and the display of the waveforms and images in these two aspects are obtained respectively. The terahertz time-domain spectral scanning imaging system is used to image the hidden objects. The results of the system imaging are analyzed, and the noise processing is obtained. In the aspect of resolution enhancement and edge detection, the imaging results are processed by Matlab software, and then the resolution of the system is analyzed. Then the imaging of the energetic materials is carried out, and the data, waveforms and images of the energetic materials in the time domain and the frequency domain are obtained, and the four kinds of energetic materials are resolved.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP391.41;O441

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