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Exact reconstruction condition for angle-limited computed tomography of chemiluminescence

机译：化学发光的角度有限计算断层扫描的精确重建条件

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摘要

Computed tomography of chemiluminescence (CTC) is an effective technique for three-dimensional (3D) combustion diagnostics. It reconstructs the 3D concentrations of intermediate species or 3D images of flame topology by multiple chemiluminescence projections captured from different perspectives. In the previous studies of CTC systems, it was assumed that projections from arbitrary perspectives are available. However, for some practical applications, the range of view angles and the number of projections might be restricted due to the optical access limitation, greatly affecting the reconstruction quality. In this paper, the exact reconstruction condition for angle-limited computed tomography of chemiluminescence was studied based on Mojette transform theories, and it was demonstrated by numerical simulations and experiments. The studies indicate that the object tested within limited angles can be well reconstructed when the number of grids, the number of projections, and the sampling rate of projections satisfy the exact reconstruction condition. By increasing the sampling rate of projections, high-quality tomographic reconstruction can be achieved by a few projections in a small angle range. Although this technique is discussed under combustion diagnostics, it can also be used and adapted for other tomography methods. (C) 2021 Optical Society of America
机译：化学发光计算机断层扫描（CTC）是一种有效的三维燃烧诊断技术。它通过从不同角度捕获的多个化学发光投影重建中间物种的三维浓度或火焰拓扑的三维图像。在以往对CTC系统的研究中，假设可以从任意角度进行预测。然而，在一些实际应用中，由于光学访问限制，视角范围和投影数量可能会受到限制，从而严重影响重建质量。本文基于Mojette变换理论，研究了化学发光角度受限层析成像的精确重建条件，并通过数值模拟和实验进行了验证。研究表明，当网格数、投影数和投影采样率满足精确重建条件时，在有限角度内被测物体可以很好地重建。通过提高投影的采样率，可以在小角度范围内通过几个投影来实现高质量的断层重建。虽然这项技术在燃烧诊断中进行了讨论，但它也可以用于其他层析成像方法。（2021）美国光学学会

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  • 来源
    《Applied optics》 |2021年第15期|共9页
  • 作者

    Wang Jia; Li Mingzhe; Cheng Junxia; Guo Zhenyan; Li Dangjuan; Wu Shenjiang;

  • 作者单位

    Xian Technol Univ Sch Optoelect Engn Xian 710021 Peoples R China;

    Xian Technol Univ Sch Optoelect Engn Xian 710021 Peoples R China;

    Xian Technol Univ Sch Optoelect Engn Xian 710021 Peoples R China;

    Nanjing Univ Sci &

    Technol Sch Elect &

    Opt Engn Nanjing 210094 Peoples R China;

    Xian Technol Univ Sch Optoelect Engn Xian 710021 Peoples R China;

    Xian Technol Univ Sch Optoelect Engn Xian 710021 Peoples R China;

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  • 正文语种 eng
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