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Soot temperature measurement within 3D flame by light-field imaging based on wave optics theory

机译：基于波光光学理论的轻场成像在3D火焰内测量烟灰温度测量

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摘要

Light-field imaging technique provides a new approach to non-intrusive temperature measurement, which can achieve 3D measurement via single detector equipment. We consider wave characteristics of radiation rays in the light-field imaging model in this work. We propose an improved light-field imaging model of an emitting and absorbing medium by combining wave optics theory and radiation transfer process in semitransparent media. The combination of Fresnel diffraction theory and phase conversion principles of the lens provides a theoretical basis for a description of radiation ray propagation in space and across the lens. The point spread function of the light-field camera can be calculated and used to attain a light-field image in accordance with the convolution imaging model. The light-field image of the flame is regarded as input to reconstruct the soot temperature field of a 3D flame. Inverse problem is formulated as a linear optimization problem and solved by Landweber algorithm. Simulated reconstruction results show that axisymmetric and non-axisymmetric temperature distribution can be reconstructed successfully, thereby verifying the applicability of the presented method. The effect of the measurement noise and the Tikhonov regularization on the reconstructed quality of the temperature are investigated as well. The results show that the temperature can be reconstructed with acceptable accuracy under different noise levels. Tikhonov regularization method is proven available in this problem.
机译：光场成像技术提供了一种新的非侵入式温度测量方法，可以通过单个探测器设备实现3D测量。我们考虑这项工作中的浅野成像模型中辐射射线的波形特征。通过在半透明介质中组合波光学理论和辐射转移过程，提出了一种改进的发射和吸收介质的光场成像模型。透镜的菲涅耳衍射理论和相位转换原理的组合为空间和透镜的辐射射线传播的描述提供了理论依据。可以根据卷积成像模型来计算光场相机的点扩散功能并用于达到光场图像。火焰的光场图像被视为输入以重建3D火焰的烟灰温度场。逆问题被制定为线性优化问题并由Landweber算法解决。模拟重建结果表明，可以成功地重建轴对称和非轴对称温度分布，从而验证所示方法的适用性。研究了测量噪声和Tikhonov正规对温度重建质量的影响。结果表明，在不同的噪声水平下，可以以可接受的精度重建温度。 Tikhonov规则化方法在此问题中可用。

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  • 来源
    《Optics and Lasers in Engineering》 |2021年第3期|106419.1-106419.20|共20页
  • 作者

    Qi Hong; Shi Jing-Wen; Su Yan-Xiong; Gao Bao-Hai; Ren Ya-Tao;

  • 作者单位

    Harbin Inst Technol Sch Energy Sci & Engn Harbin 150001 Peoples R China|Minist Ind & Informat Technol Key Lab Aerosp Thermophys Harbin 150001 Peoples R China;

    Harbin Inst Technol Sch Energy Sci & Engn Harbin 150001 Peoples R China|Minist Ind & Informat Technol Key Lab Aerosp Thermophys Harbin 150001 Peoples R China;

    Harbin Inst Technol Sch Energy Sci & Engn Harbin 150001 Peoples R China|Minist Ind & Informat Technol Key Lab Aerosp Thermophys Harbin 150001 Peoples R China;

    Harbin Inst Technol Sch Energy Sci & Engn Harbin 150001 Peoples R China|Minist Ind & Informat Technol Key Lab Aerosp Thermophys Harbin 150001 Peoples R China;

    Harbin Inst Technol Sch Energy Sci & Engn Harbin 150001 Peoples R China|Minist Ind & Informat Technol Key Lab Aerosp Thermophys Harbin 150001 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Light-field imaging model; Point spread function; Wave optics theory; Soot temperature measurement; Inverse problem;

    机译：轻场成像模型;点传播功能;波光学理论;烟灰温度测量;反问题;

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