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CO是含碳化合物在燃烧过程中产生的一种重要中间物质, 通过对CO的吸收光谱测量可以实现对燃烧过程的诊断. 针对CO的测量多使用传统的单吸收线和双吸收线技术, 在基于吸收光谱技术的燃烧场二维参数分布测量中, 需设置大量的光束投影以满足空间分辨要求. 宽光谱吸收技术可以在单次扫描内获得整个宽带扫描波段的吸收信息, 与传统的分立谱线窄带吸收技术相比, 具有非常明显的技术优势. 使用宽光谱吸收技术可以大大减少光束投影数量要求, 有效降低系统复杂度, 改善参数反演鲁棒性, 提高测量系统适用性. 但是, 目前针对CO的宽光谱吸收测量则鲜有报道, 亟需开展相关的基础研究工作. 本文利用1.5 μm波段宽带可调谐光源对室温中的CO开展了宽光谱吸收测量实验, 并对不同压强下CO的吸收特性进行了对比, 实验测量结果与HITRAN2016数据库相吻合. 利用1565—1570 nm范围内的实测宽光谱吸收数据, 通过一阶导数法对CO温度和摩尔分数进行了反演; 虽然宽带吸收光谱各吸收峰强度测量值存在一定畸变, 但依然得到了准确的反演结果, 温度和摩尔分数反演误差均在5%以内, 验证了宽光谱吸收测量的可靠性, 为后续基于CO宽光谱吸收测量的燃烧流场二维层析诊断提供了技术支撑.
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关键词:
- 吸收光谱/
- 可调谐二极管激光吸收光谱技术/
- 宽光谱吸收/
- 二维层析诊断/
- 燃烧流场
As an important medial product in the combustion process of carbon-based compounds, CO serves as one of the preferable candidates for combustion diagnosis in absorption spectrum. So far, most of researches have focused on the conventional one-line or dual-line technique, which requires a number of beam projections for two-dimension (2D) tomography of combustion field. Hyperspectral absorption spectroscopy enables continuous acquisition of absorption information over a whole absorption band, rather than one or two discrete absorption lines, demonstrating remarkable advantage over the traditional one-line and dual-line techniques. Hyperspectral absorption spectroscopy can not only reduce the system complexity with limited projections for high spatial resolution 2D tomography, but also improve the system applicability by refining the measurement robustness. However, up to now, little attention has been paid to hyperspectral absorption of CO. Here, by using a wideband tunable laser source around 1.5 μm, experiments are conducted at room temperature to investigate the hyperspectral absorption characteristics of CO in the near infrared band. Absorptions under different pressure conditions are compared with each other. And, the measured results are consistent with the HITRAN2016 database. With the measured hyperspectral absorption information in the 1565–1570 nm range, temperature and mole fraction of CO are derived by the first derivative method. Despite the distortion of the recorded absorption peaks, accurate results are obtained with measurement errors within 5% for both temperature and mole fraction, thereby validating the reliability of hyperspectral absorption technique for CO. And, this research is instructive for future 2D tomography of combustion fields based on hyperspectral absorption of CO.-
Keywords:
- absorption spectroscopy/
- tunable diode laser absorption spectroscopy/
- hyperspectral absorption/
- two-dimension tomography/
- combustion field
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Lines T/K L1 L2 L3 L4 L1 — 401.66 318.64 342.92 L2 401.66 — 259.62 316.15 L3 318.64 259.61 — 417.04 L4 342.92 316.15 417.03 — 
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