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Tomographic absorption spectroscopy for the study of gas dynamics and reactive flows
Progress in Energy and Combustion Science ( IF 29.5 ) Pub Date : 2017-03-01 , DOI: 10.1016/j.pecs.2016.11.002
Weiwei Cai , Clemens F. Kaminski

Abstract Optical imaging techniques are ubiquitous for the resolution of non-uniformities in gas flows. Planar imaging techniques such as laser-induced fluorescence are well established and applied extensively in turbulent reactive flows, offering both high temporal and spatial resolutions. However, planar imaging suffers from a critical disadvantage, the requirement for spatially continuous optical access over large solid angles in both the excitation and detection paths and this precludes their application in many practical situations, for example those encountered in engine testing. Tomographic absorption spectroscopy, TAS, on the other hand, shares many of the advantages of planar imaging techniques but reduces the demands for optical access, because high quality data can be obtained with sparsely sampled volumes. The technique has unrivalled potential for imaging in harsh environments, for example for in-cylinder/in-chamber engine measurements. TAS is beginning to mature as a technique for the simultaneous imaging of temperature and species concentration, and is experiencing a surge of interest due to progress in laser technology, spectroscopy, and theoretical developments of nonlinear tomography techniques. The recent advancements in broad bandwidth, frequency-agile laser sources massively enrich the spectral information obtainable in TAS. Furthermore, nonlinear tomography enables the recovery of multiplexed information from a single tomographic inversion. The utilization of multispectral information improves the immunity of TAS to experimental noise and makes possible the simultaneous imaging of temperature, pressure, and multiple species. Nonlinear tomography can also be used to empower the imaging potential of sensitive and robust absorption techniques, such as wavelength modulation spectroscopy, for use in harsh and even optically dense environments. In combination, this greatly extends the applicability of TAS for more general and harsh scenarios in combustion technology. In this article we review basic concepts and mathematical foundations of classical absorption tomography, proceeding to more advanced recent concepts based on nonlinear tomography, and providing an extensive review of experimental demonstrations and practical applications in the context of state-of-the-art combustion research.

中文翻译:

用于研究气体动力学和反应流的断层扫描吸收光谱

摘要 光学成像技术普遍用于解决气流中的非均匀性问题。平面成像技术,如激光诱导荧光,已被广泛应用在湍流反应流中,提供高时间和空间分辨率。然而,平面成像有一个严重的缺点,即需要在激发和检测路径中的大立体角上进行空间连续的光学访问,这阻碍了它们在许多实际情况中的应用,例如在发动机测试中遇到的情况。另一方面,断层吸收光谱 TAS 具有平面成像技术的许多优点,但减少了对光学访问的需求,因为可以通过稀疏采样体积获得高质量数据。该技术具有在恶劣环境中成像的无与伦比的潜力,例如用于缸内/室内发动机测量。TAS 作为一种同时成像温度和物种浓度的技术开始成熟,并且由于激光技术、光谱学和非线性断层扫描技术的理论发展的进步而引起人们的兴趣。宽带宽、频率捷变激光源的最新进展极大地丰富了 TAS 中可获得的光谱信息。此外,非线性断层扫描能够从单个断层扫描反演中恢复多路复用信息。多光谱信息的利用提高了 TAS 对实验噪声的免疫力,并使温度、压力和多个物种的同时成像成为可能。非线性断层扫描还可用于增强敏感和稳健的吸收技术(例如波长调制光谱)的成像潜力,以用于恶劣甚至光密环境。结合起来,这极大地扩展了 TAS 的适用性,适用于燃烧技术中更一般和更苛刻的场景。在本文中,我们回顾了经典吸收层析成像的基本概念和数学基础,进一步介绍了基于非线性层析成像的更先进的最新概念,并在最先进的燃烧研究背景下对实验演示和实际应用进行了广泛回顾. 用于恶劣甚至光密环境。结合起来,这极大地扩展了 TAS 的适用性,适用于燃烧技术中更一般和更苛刻的场景。在本文中,我们回顾了经典吸收层析成像的基本概念和数学基础,进一步介绍了基于非线性层析成像的更先进的最新概念,并在最先进的燃烧研究背景下对实验演示和实际应用进行了广泛回顾. 用于恶劣甚至光密环境。结合起来,这极大地扩展了 TAS 的适用性,适用于燃烧技术中更一般和更苛刻的场景。在本文中,我们回顾了经典吸收层析成像的基本概念和数学基础,进一步介绍了基于非线性层析成像的更先进的最新概念,并在最先进的燃烧研究背景下对实验演示和实际应用进行了广泛回顾.
更新日期:2017-03-01
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