用单光束吸收光谱法解析非均匀温度分布。第II部分：宽带频谱实现
Resolving nonuniform temperature distributions with single-beam absorption spectroscopy. Part II: Implementation from broadband spectra
摘要：
过去的几项研究已经描述了吸收光谱学如何通过测量许多分子吸收跃迁对温度的独特非线性响应并进行反演来确定沿光路的空间温度变化。新的激光吸收光谱技术非常适合这种非均匀性测量，但目前的分析方法只使用孤立的功能，而不是一个完整的宽带光谱测量。在这项工作中，我们开发了一种约束光谱拟合技术称为E”-binning来拟合非均匀环境中产生的吸收光谱。然后将从E”-面元中提取的信息输入到本系列前一篇论文（Malarich和Rieker，JQSRT 107455）的反演方法中，以确定温度分布。我们通过使用双频梳状激光测量来解决管式炉中的对流单元来证明这种方法。在每个测量高度恢复的温度分布与现有的自然对流模型一致。最后，我们表明，对于真实世界的测量噪声和吸收模型误差，增加带宽和测量的吸收跃迁的数量可以提高温度分布的精度。我们使拟合代码公开可用于任何宽带吸收测量。
英文摘要：
Several past studies have described how absorption spectroscopy can be used to determine spatial temperature variations along the optical path by measuring the unique, nonlinear response to temperature of many molecular absorption transitions and performing an inversion. New laser absorption spectroscopy techniques are well-suited to this nonuniformity measurement, yet present analysis approaches use only isolated features rather than a full broadband spectral measurement. In this work, we develop a constrained spectral fitting technique called E"-binning to fit an absorption spectrum arising from a nonuniform environment. The information extracted from E"-binning is then input to the inversion approach from the previous paper in this series (Malarich and Rieker, JQSRT 107455) to determine the temperature distribution. We demonstrate this approach by using dual frequency comb laser measurements to resolve convection cells in a tube furnace. The recovered temperature distributions at each measurement height agree with an existing natural convection model. Finally, we show that for real-world measurements with noise and absorption model error, increasing the bandwidth and the number of measured absorption transitions may improve the temperature distribution precision. We make the fitting code publicly available for use with any broadband absorption measurement.
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