Two-color absorption spectroscopy strategy for measuring the column density and path average temperature of the absorbing species in nonuniform gases
Two-color absorption spectroscopy strategy for measuring the column density and path average temperature of the absorbing species in nonuniform gases
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DOI：
10.1364/ao.52.007950
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发表时间：
2013-11-20
期刊：
影响因子：
1.9
通讯作者：
Hanson, Ronald K.
中科院分区：
文献类型：
--
作者：
Goldenstein, Christopher S.;Schultz, Ian A.;Hanson, Ronald K.
开发了一种双色吸收光谱策略，用于测量不均匀气体中吸收物质的柱密度和密度加权路径平均温度。该策略使用两个转变，其强度几乎与温度成线性比例。此外，测量的线形用于精确模拟吸收光谱。因此，吸收物质的柱密度和密度加权路径平均温度可以通过将非均匀视线 (LOS) 上测量的信号与使用均匀视线计算的模拟信号进行比较来推断。通过模拟非均匀 LOS 上的水蒸气吸收，模拟了该策略，其温度和成分梯度与氢-空气扩散火焰中的温度和成分梯度相当。在此演示中，水蒸气的柱密度和密度加权路径平均温度均恢复到 0.5% 以内。 (C) 2013 美国光学学会
A two-color absorption spectroscopy strategy has been developed for measuring the column density and density-weighted path-average temperature of the absorbing species in nonuniform gases. This strategy uses two transitions with strengths that scale nearly linearly with temperature. In addition, measured lineshapes are used to accurately model absorbance spectra. As a result, the column density and density-weighted path-average temperature of the absorbing species can be inferred from a comparison of signals measured across a nonuniform line of sight (LOS) with simulated signals calculated using a uniform LOS. This strategy is demonstrated with simulations of water-vapor absorption across a nonuniform LOS with temperature and composition gradients comparable to those in hydrogen-air diffusion flames. In this demonstration, both the column density and density-weighted path-average temperature of water vapor are recovered to within 0.5%. (C) 2013 Optical Society of America