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光场单相机三维流场测试技术

丁俊飞 许晟明 施圣贤

丁俊飞, 许晟明, 施圣贤. 光场单相机三维流场测试技术[J]. 实验流体力学, 2016, 30(6): 50-58. doi: 10.11729/syltlx20160141
引用本文: 丁俊飞, 许晟明, 施圣贤. 光场单相机三维流场测试技术[J]. 实验流体力学, 2016, 30(6): 50-58. doi: 10.11729/syltlx20160141
Ding Junfei, Xu Shengming, Shi Shengxian. Light field volumetric particle image velocimetry[J]. Journal of Experiments in Fluid Mechanics, 2016, 30(6): 50-58. doi: 10.11729/syltlx20160141
Citation: Ding Junfei, Xu Shengming, Shi Shengxian. Light field volumetric particle image velocimetry[J]. Journal of Experiments in Fluid Mechanics, 2016, 30(6): 50-58. doi: 10.11729/syltlx20160141

光场单相机三维流场测试技术

doi: 10.11729/syltlx20160141
基金项目: 

国家自然科学基金 11472175

上海市启明星项目 15QA1402400

详细信息
    作者简介:

    丁俊飞(1992-), 男, 山西太原人, 博士研究生。研究方向:三维流体测量。通信地址:上海交通大学机械与动力工程学院燃气轮机研究院(200240)。E-mail:junfeiding@sjtu.edu.cn

    通讯作者:

    施圣贤, E-mail:kirinshi@sjtu.edu.cn

  • 中图分类号: V211.71

Light field volumetric particle image velocimetry

  • 摘要: 将光场三维成像技术与实验流体力学相结合,实现单相机对空间三维瞬态流场(3D3C)的精确测量,为流体力学实验研究提供了一种全新的测试技术。详细介绍了具有自主知识产权的光场相机硬件系统、基于乘积代数重建技术(MART)的粒子光场图像重构算法以及基于光线追迹的数字光场图像合成算法。利用DNS数字合成图像以及低速射流实验图像,将所发展的光场单相机三维流场测试技术(Light Field Particle Image Velocimetry,LF-PIV)与目前最成熟的三维流场测试技术层析PIV(Tomographic Particle Image Velocimetry,Tomo-PIV)进行对比研究分析。实验结果表明LF-PIV技术完全能达到与Tomo-PIV同等量级的测量精度。
  • 图  1  光场的2种参数化表示方式[29]

    Figure  1.  Two methods of light field parameterisation

    图  2  光场相机原理示意图及光线追迹原理示意图[26, 28]

    Figure  2.  Schematics of light field camera and ray tracing method

    图  3  自主光场相机系统

    Figure  3.  In-house light field camera system

    图  4  原始光场图片及光场渲染效果

    Figure  4.  Raw light field image and results of refocusing and perspective shift processing

    图  5  基于密集光线追迹的权重系数算法原理示意图[26, 28]

    Figure  5.  Schematics of ray tracing based weighting coefficient method

    图  6  对比仿真分析结果

    Figure  6.  Simulation results

    图  7  LF-PIV和Tomo-PIV的测量误差

    Figure  7.  Measurement error of LF-PIV and Tomo-PIV

    图  8  LF-PIV、Tomo-PIV同步测试实验系统实物图

    Figure  8.  Experimental setup of LF-PIV and Tomo-PIV system

    图  9  实验粒子光场图像局部放大图

    Figure  9.  Real light field particle image (zoom in)

    图  10  实验三维瞬态速度场

    Figure  10.  Instantaneous velocity fields

    表  1  用于产生数字合成光场图像的光学参数数值

    Table  1.   Parameters for generating synthetic light field images

    符号意义相机参数合成图像参数
    nlxMLA x方向分辨率410410
    nlyMLA y方向分辨率310310
    pl微透镜单元直径77μm77μm
    fl微透镜焦距310μm310μm
    npx相机x方向分辨率6600pixel6600pixel
    npy相机y方向分辨率4400pixel4400pixel
    pp像素直径5.5μm5.5μm
    fm主镜头焦距-50mm
    pm主镜头孔径-25mm
    So物距-100mm
    Sl相距-100mm
    M放大系数--1
    (f/#)m主镜头f-2
    (f/#)l微透镜f-4
    下载: 导出CSV
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出版历程
  • 收稿日期:  2016-09-18
  • 修回日期:  2016-10-13
  • 刊出日期:  2016-12-25

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