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火焰辐射光场成像光线采样特性

刘煜东 许传龙 孙俊 张彪 王式民

刘煜东, 许传龙, 孙俊, 等 . 火焰辐射光场成像光线采样特性[J]. 北京航空航天大学学报, 2017, 43(11): 2207-2215. doi: 10.13700/j.bh.1001-5965.2017.0067
引用本文: 刘煜东, 许传龙, 孙俊, 等 . 火焰辐射光场成像光线采样特性[J]. 北京航空航天大学学报, 2017, 43(11): 2207-2215. doi: 10.13700/j.bh.1001-5965.2017.0067
LIU Yudong, XU Chuanlong, SUN Jun, et al. Characterization of ray sampling for flame radiation in light field imaging[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(11): 2207-2215. doi: 10.13700/j.bh.1001-5965.2017.0067(in Chinese)
Citation: LIU Yudong, XU Chuanlong, SUN Jun, et al. Characterization of ray sampling for flame radiation in light field imaging[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(11): 2207-2215. doi: 10.13700/j.bh.1001-5965.2017.0067(in Chinese)

火焰辐射光场成像光线采样特性

doi: 10.13700/j.bh.1001-5965.2017.0067
基金项目: 

国家自然科学基金 51676044

国家自然科学基金 51506030

国家自然科学基金 51327803

江苏省自然科学基金杰出青年基金 BK20150023

详细信息
    作者简介:

    刘煜东 男, 博士研究生。主要研究方向:火焰三维温度场测量

    许传龙 男, 博士, 教授, 博士生导师。主要研究方向:多相流测试、燃烧诊断技术

    通讯作者:

    许传龙, E-mail: chuanlongxu@seu.edu.cn

  • 中图分类号: TK311;TB811+.3

Characterization of ray sampling for flame radiation in light field imaging

Funds: 

National Natural Science Foundation of China 51676044

National Natural Science Foundation of China 51506030

National Natural Science Foundation of China 51327803

Natural Science Foundation of Jiangsu Province for Distinguished Young Scholars BK20150023

More Information
  • 摘要:

    为了研究全光相机对火焰等半透明介质的光场采样并优化全光相机的参数,基于近轴光学,建立了全光相机的逆向光线追迹模型。在此基础上,针对弥散介质沿采集方向的半透明特性,提出了像素采样锥形角以及物方采样角度等评价光线角度采样的性能指标,据此分析了全光相机像素和微透镜的位置对光场采样特性的影响,以及全光相机光学参数变化对光线方向采样性能的影响。结果表明:采集火焰辐射光场时,较小的微透镜直径有利于提高光场采样的单方向性,并减小主镜头入瞳直径,而较小的主镜头焦距有利于增大物方采样角度。

     

  • 图 1  全光相机成像示意图

    Figure 1.  Schematic of plenoptic camera imaging

    图 2  全光相机光线追迹与评价指标示意图

    Figure 2.  Schematic of ray tracing and evaluation indices of plenoptic camera

    图 3  图像仿真结果对比

    Figure 3.  Comparison of image simulation results

    图 4  像素采样锥形角随像素位置的分布

    Figure 4.  Distribution of cone angle of a single pixel with positions of pixels

    图 5  物方采样角度随子图像位置的分布

    Figure 5.  Distribution of sampling angle of object side with positions of sub-images

    图 6  角度分辨率随像素位置的分布

    Figure 6.  Distribution of angular resolution with positions of pixels

    图 7  性能指标和光学参数随主镜头焦距的变化

    Figure 7.  Variation of performance indices and optical parameters with focal lengths of main lens

    图 8  性能指标和光学参数随主镜头-微透镜距离的变化

    Figure 8.  Variation of performance indices and optical parameters with main-micro lens distances

    图 9  性能指标和光学参数随微透镜焦距的变化

    Figure 9.  Variation of performance indices and optical parameters with focal lengths of micro lens

    图 10  性能指标和光学参数随微透镜直径的变化

    Figure 10.  Variation of performance indices and optical parameters with diameters of micro lens

    表  1  全光相机参数

    Table  1.   Parameters of plenoptic camera

    参数 数值
    主镜头焦距fU/mm 50
    微透镜焦距fs/μm 567
    微透镜直径pm/μm 165
    主镜头-微透镜距离bU/mm 52
    物距a/mm 1 300
    微透镜-CCD距离lm/μm 573
    像素尺寸pp/μm 5.5
    下载: 导出CSV

    表  2  全光相机参数变化范围

    Table  2.   Variation range of parameters of plenoptic camera

    参数 数值
    主镜头焦距fU/mm 20~51.5
    主镜头-微透镜距离bU/mm 50.5~200
    微透镜焦距fs/μm 50~1 500
    微透镜直径pm/μm 50~500
    下载: 导出CSV

    表  3  性能指标和光学参数的变化

    Table  3.   Variation of performance indices and optical parameters

    参数 fU bU fs pm
    β NA - NA +
    ω - + - +
    D NA + - +
    a + - NA NA
    下载: 导出CSV
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出版历程
  • 收稿日期:  2017-02-15
  • 录用日期:  2017-05-19
  • 刊出日期:  2017-11-20

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