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首页> 外文期刊>Spectroscopy Letters >Numerical simulations to improve the performance of tunable diode laser absorption tomography in a harsh combustion environment
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Numerical simulations to improve the performance of tunable diode laser absorption tomography in a harsh combustion environment

机译：提高可调谐二极管激光吸收断层扫描在苛刻燃烧环境中的性能的数值模拟

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摘要

The impact of measurement noise and tomographic methods on reconstruction quality are investigated via simulation studies under a hypothesis harsh flow field environment. Computer tomographic methods based on direct absorption spectroscopy and wavelength modulation spectroscopy are conducted under different measurement noise levels to assess the noise effect quantitatively. It turns out that the wavelength modulation spectroscopy-based tomographic method shows efficient immunity to measurement noise. However, the direct absorption spectroscopy-based tomographic method is found to be susceptible to the measurement noise, which makes the reconstruction quality decline with the increasing noise level. In addition, two kinds of tomographic methods including linear and nonlinear method are investigated under a complex multimodal temperature distribution environment with limited projection data. The reconstructed distribution for the nonlinear tomographic method reveals great fidelity to the original value with a maximum deviation of 51.9K, while the reconstructed distribution for the linear tomographic method under parallel beam arrangement shows an obvious distortion.
机译：在假设苛刻流场环境下，通过模拟研究研究了测量噪声和断层扫描方法对重建质量的影响。基于直接吸收光谱和波长调制光谱的计算机断层测量方法在不同的测量噪声水平下进行，以定量评估噪声效果。事实证明，基于波长调制光谱的层析方法显示出对测量噪声的有效免疫力。然而，发现基于直接吸收光谱的层析方法易受测量噪声影响，这使得重建质量随着噪音水平的增加而下降。另外，在具有有限投影数据的复杂多模式温度分布环境下研究了包括线性和非线性方法的两种断层方法。非线性断层法的重建分布揭示了最大偏差为51.9k的原始值的极大的保真度，而平行波束布置下的线性断层法的重建分布显示了明显的失真。

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