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| 激光莫尔干涉谱投影信息提取 | |
| 引用本文： | 宋一中,赵志敏,贺安之.激光莫尔干涉谱投影信息提取[J].光谱学与光谱分析,2009,29(1). |
| 作者姓名： | 宋一中 赵志敏 贺安之 |
| 作者单位： | 1. 南京航空航天大学理学院物理系,江苏,南京,210016;德州学院物理系,山东,德州,253000 2. 南京航空航天大学理学院物理系,江苏,南京,210016 3. 南京理工大学理学院信息物理与工程系,江苏,南京,210094 |
| 基金项目： | 中国博士后科学基金，江苏省博士后基金，国家自然科学基金 |
| 摘 要： | 分析了真实火箭喷焰的激光莫尔干涉谱,并提取其投影信息,重建了密度场.使用自制的大口径、高灵敏度莫尔偏折仪采集真实火箭喷焰的莫尔条纹图;采用傅里叶变换对莫尔条纹展开技术处理,获得了莫尔条纹的相位分布.根据莫尔条纹边缘提取背景,进一步获得背景相位分布.变形莫尔条纹的形变量通过求相位差获得,进一步提取轴向任意截面的投影信息.应用基于偏折投影的"简单自相关代数迭代重建算法(SSART)"层析流场.等间隔取8个方向的投影进行迭代,重建了截面密度分布图.结果发现,根据火箭喷焰的莫尔条纹,采用傅里叶变换相位展开技术,可以方便地提取任意截面的投影信息.应用SSART技术可以重建截面密度分布.因此,基于偏折投影的"SSART"算法是一种优良的非线性偏折层析重建算法. |
| 关 键 词： | 莫尔条纹 傅里叶变换 投影 重建 层析 |
Extracting Projections from Laser Moire Interference Spectra |
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| SONG Yi-zhong,ZHAO Zhi-min,HE An-zhi.Extracting Projections from Laser Moire Interference Spectra[J].Spectroscopy and Spectral Analysis,2009,29(1). | |
| Authors: | SONG Yi-zhong ZHAO Zhi-min HE An-zhi |
| Institution: | SONG Yi-zhong1,2,ZHAO Zhi-min1,HE An-zhi31.Department of Physics,Science Institute,Nanjing University of Aeronautics , Astronautics,Nanjing 210016,China2.Department of Physics,Dezhou University,Dezhou 253000,China3.Department of Information Physics , Engineering,Nanjing University of Science , Technology,Nanjing 210094,China |
| Abstract: | Laser Moire Interference spectra of rocket exhausted plumes were analyzed.Projections for reconstruction were figured out,and air density distribution was reconstructed.Moire deflectograms of the plumes were produced and captured with a home-made,wide-range,high-sensitivity Moire deflectometer.Moire interference spectra were processed by phase unwrapping technique with Fourier transform,so the space phase distribution of Moire deflectograms was extracted.The background was worked out based on the margin of ... |
| Keywords: | Moire interference spectra Fourier transform Projection Reconstruction Tomography |
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