北京航空航天大学学报 ›› 2017, Vol. 43 ›› Issue (11): 2207-2215.doi: 10.13700/j.bh.1001-5965.2017.0067

• 先进测量手段 • 上一篇    下一篇

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   

  1. 东南大学 能源与环境学院 能源热转换及其过程测控教育部重点实验室, 南京 210096
  • 收稿日期:2017-02-15 修回日期:2017-05-19 出版日期:2017-11-20 发布日期:2017-09-18
  • 通讯作者: 许传龙 E-mail:chuanlongxu@seu.edu.cn
  • 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。
  • 基金资助:
    国家自然科学基金(51676044,51506030,51327803);江苏省自然科学基金杰出青年基金(BK20150023)

Characterization of ray sampling for flame radiation in light field imaging

LIU Yudong, XU Chuanlong, SUN Jun, ZHANG Biao, WANG Shimin   

  1. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China
  • Received:2017-02-15 Revised:2017-05-19 Online:2017-11-20 Published:2017-09-18
  • Supported by:
    National Natural Science Foundation of China (51676044, 51506030, 51327803); Natural Science Foundation of Jiangsu Province for Distinguished Young Scholars (BK20150023)

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。

关键词: 火焰辐射, 光场成像, 逆向光线追迹, 半透明介质, 角度采样

Abstract: To investigate the radiation sampling of the translucent media and optimize the parameters of a plenoptic camera, a backward ray tracing model is established based on the paraxial approximation in this paper. Considering the integrating properties along the sampling path of the translucent media, several indices for evaluating the angular sampling are then proposed such as cone angle of a single pixel and sampling angel of object side. The effects of the positions of the pixels and micro lenses of the plenoptic camera on the radiation sampling and the effects of the optical parameters of the plenoptic camera on ray direction sampling performance are analyzed. The results indicate that, for the light field sampling on flame radiation, a smaller diameter of the micro lens is useful for improving the accuracy of radiation sampling in certain direction and decreasing the size of main lens aperture. Moreover, smaller focal length of main lens is advantageous for improving the sampling angle of object side.

Key words: flame radiation, light field imaging, backward ray tracing, translucent media, angular sampling

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