滤光片型光谱成像技术研究

	滤光片型光谱成像技术研究
其他题名	Study of spectral imaging system based on filter
	王颖
学位类型	硕士
导师	巩岩
	2015-10
学位授予单位	中国科学院大学
学位专业	光学工程
关键词	光谱学成像光谱仪线性渐变滤光片光学设计光学仪器
摘要	成像光谱仪（Imaging Spectrometer）是一种将光学成像技术与成像光谱技术相结合，同时获取二维空间信息与一维光谱信息，组成三维“数据立方” 的仪器。其应用涉及到地面测绘遥感、军事伪装辨别、自然灾害预警、医疗检测等方面，具有重要的应用价值。滤光片型成像光谱仪具有结构紧凑、简单，易于标定等特点被广泛应用，但传统线性渐变滤光片（Linear Various Filter，LVF）光谱成像系统由于存在光谱混叠导致的光谱分辨率难提高的事实，使其探测精度在一定程度上受到限制。本文首先介绍了成像光谱仪的概述，分类以及国内外研究现状，然后着重介绍了滤光片型光谱成像系统的三种主要类型以及各自分光原理。并且对LVF 型光谱成像技术进行了较为深入的研究。具体如下：（1）基于LVF 成像光谱仪的系统结构参数，分析影响其探测精度的因素，提出一种减小光谱混叠，提高分辨率的新结构。（2）针对工作波段为600 nm ~ 1100 nm 的LVF，设计了一个宽光谱扫描型LVF 多光谱成像光谱仪的成像物镜，总长小于85 mm，畸变小于0.01%，全视场各波段Nyquist 频率下MTF 优于0.7，空间角分辨率可达1.02'。（3）在前置物镜的基础上，考虑孔径和视场匹配原则，确定中继系统的技术参数，设计了与前置物镜相匹配的中继系统，完成了整个光学系统设计。并对整个系统进行了公差分配以及系统透过率计算。（4）根据实验室现有条件，选择物镜、中继镜、线性渐变滤光片以及探测器搭建实验平台，进行光谱标定，光谱分辨率和空间分辨率的测试，最后进行了水果成熟度检验实验，确定了西红柿成熟度检验的特征波长。本文研究设计的LVF 型光谱成像系统，具有探测精准、体积小的特点，与现有同类型的LVF 多光谱成像光谱仪相比具有空间和光谱分辨率高等优点。
其他摘要	As a instrument, imaging spectrometer combines optical imaging and imaging spectroscopy. It has been widely used in the fields such as ground survey, military camouflage, natural disaster warning and medical treatment. It is an important part of optical detection technology. The imaging spectrometer has the advantages of compact, simple structure and calibration easily, but the conventional Linear Various Filter spectral imaging system has a shortcoming of spectrum aliasing, which seriously affects the detection accuracy. Firstly, the overview of imaging spectrometer, the classification and the research status at home and abroad are introduced, and what`s more the main points of the optical spectrum imaging system are described. And the LVF spectral imaging technology is studied deeply. As follows: (1) The factors affecting the accuracy of the imaging spectrometer are analyzed, and a new structure is proposed to reduce the spectrum aliasing and improve the resolution. (2) A wide spectrum scanning LVF imaging objective lens with 600 nm ~ 1100 LVF is designed, and the total length is less than 85 mm, the distortion is less than 0.01%, and MTF of full field view is better than 0.7, and the spatial resolution is 1.02'. (3) On the basis of the imaging objective lens, the technical parameters of the relay system are determined by taking into account the principle of aperture and field of view. Tolerance distribution and system transmission rate are calculated. (4) According to the existing conditions of the laboratory, select relay mirror, linear various filter and detector to set up the experimental platform, the spectral calibration has been done, tested the spectral resolution and spatial resolution. And finally a fruit maturity test experiments has been done, which confirmed that this system can be applied to automated fruit maturity detection. This paper studies the design of the LVF imaging spectrometer system has an advantage of accurate, small. Compared with the others, the LVF multi spectral imaging spectrometer has higher spatial and spectral resolution.
语种	中文
文献类型	学位论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/49320
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	王颖. 滤光片型光谱成像技术研究[D]. 中国科学院大学,2015.

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