Multiplexed absorption tomography with calibration-free wavelength modulation spectroscopy
Multiplexed absorption tomography with calibration-free wavelength modulation spectroscopy
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DOI：
10.1063/1.4871976
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发表时间：
2014-04
影响因子：
4
通讯作者：
Weiwei Cai;C. Kaminski
中科院分区：
文献类型：
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作者：
Weiwei Cai;C. Kaminski
我们提出了一种多路吸收层析成像技术，该技术使用可调谐半导体激光器的无校准波长调制光谱，用于在恶劣燃烧环境中同时成像温度和物质浓度。与常用的直接吸收光谱（DAS）相比，本版本具有更好的信噪比，并且不需要基线拟合，这对于高压应用来说是一个特别理想的特性，在高压应用中，相邻的吸收特征重叠且干扰严重。我们使用严酷燃烧环境的真实模拟模型对该技术进行了概念验证数值演示，并证明所提出的技术优于目前基于DAS的可用断层扫描技术。
We propose a multiplexed absorption tomography technique, which uses calibration-free wavelength modulation spectroscopy with tunable semiconductor lasers for the simultaneous imaging of temperature and species concentration in harsh combustion environments. Compared with the commonly used direct absorption spectroscopy (DAS) counterpart, the present variant enjoys better signal-to-noise ratios and requires no baseline fitting, a particularly desirable feature for high-pressure applications, where adjacent absorption features overlap and interfere severely. We present proof-of-concept numerical demonstrations of the technique using realistic phantom models of harsh combustion environments and prove that the proposed techniques outperform currently available tomography techniques based on DAS.