【作者】 张伟；

【导师】 韩军；

【作者基本信息】 西安工业大学 ， 光学工程， 2013， 硕士

【摘要】 光谱和图像是人们认识感知大自然最重要的两种技术手段。时间调制FFT成像光谱仪的发明,将反映物质内部成份的光谱图与反映物体外部形态的图像巧妙地结合起来。由于时间调制FFT成像光谱仪具有很高的光谱分辨率,能够提供丰富的事物内部元素的光谱信息,因此受到人们的极大关注,其应用领域已涉及到人类社会与科技发展的各个方面。时间调制FFT成像光谱技术所追求的目标就是高光谱分辨率,但是目前所能达到的光谱分辨率还不能满足日新月异的科技和社会发展需求。为了提高时间调制FFT成像光谱技术的光谱分辨率,论文针对光谱分辨率的影响因素进行了研究。本文首先介绍了成像光谱技术国内外的发展现状及研究趋势,阐明了时间调制FFT成像光谱技术的研究目的和意义,详细论述了时间调制FFT成像光谱技术的基本工作原理；然后,重点对时间调制FFT成像光谱技术的光谱分辨率的影响因素解析为光谱分辨率与四大性能参数之间的关系,进行详细的分析和讨论,利用光学设计软件ZEMAX做建模仿真分析；基于论文研究成果,提出了一类新型时间调制FFT成像光谱技术方案,将单个平面动镜和单个平面定镜的配合系统改进设计为由多个角镜和平面反射镜的组合系统,缩短了动镜的实际运动导轨长度,仍能够获得同样要求的最大光程差；最后,拟定了一个时间调制FFT成像光谱技术光谱分辨率的实现方案,采用新型单角镜时间调制FFT成像光谱技术,在成像波段3～51μm达到光谱分辨率10～20nm,并搭建实验平台验证了它的合理性。研究结果表明,时间调制FFT成像光谱仪的光谱分辨率除了主要由最大光程差决定之外,还与空间分辨率、时间分辨率、辐射分辨率之间存在着相互联系与制约的关系,是一个需要综合权衡的参量。更多还原

【Abstract】 Spectrum and image are two technical ways for our people to observe the nature. The invention of the FFT-based time modulated imaging spectrometer masterly makes the combination of the object image and the spectrum of the internal component material possible. Due to the high spectral resolution of the FFT-based time modulated imaging spectrometer and the abundant spectral information of the internal elements, there’s much attention paid on it. Also, its application has spread over all aspects of the human society and the development of science and technology. High spectral resolution is the pursuit of the technology of the FFT-based time modulated imaging spectral. But at present, the spectral resolution we can achieve cannot meet the demand of the science and social development.In order to improve spectral resolution of the FFT-based time modulated imaging spectral technology, this paper has studied the factors affecting the spectral resolution. Firstly, the paper introduces the development status and trend of imaging spectral technique at home and abroad, expounds the FFT-based time modulated imaging spectroscopy of the purpose and significance of the study, and it is about the basic working principle of the FFT-based time modulated imaging spectral technology in detail; Then, it focuses on the effects of spectral resolution of the FFT-based time modulated imaging spectral technology and analysis of the relationship between the spectral resolution and four performance parameters, which is analyzed and discussed in detail, then uses the optical design software ZEMAX in modeling and analysis of simulation; based on the research results of this paper, it develops a kind of new FFT-based time modulated imaging spectral technique scheme, which is a improved combination of several angle mirrors and plane mirrors instead the one of an angle mirror and a plane mirror, and it reduces the actual movement track length of the moving mirror but still obtains the same required maximum optical path; Finally, it designs a scheme of spectral resolution of the FFT-based time modulated imaging spectral technology, the scheme uses the model of single mirror FFT-based time modulated imaging spectral technology, that achieves the spectral resolution 10～20nm in imaging wave band 3～5μm, and sets up a experimental platform to verify its rationality.The research results show that the spectral resolution of the FFT-based time modulated imaging spectral technology is a trade-off parameter which is mainly affected by the maximum optical path difference. In addition, there is mutual connection and restriction among the spatial resolution, time resolution, radiation resolution and spectral resolution.更多还原