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首页> 外文期刊>Applied optics >Measurements of OH radical concentration in combustion environments by wavelength-modulation spectroscopy with a 1.55-μm distributed-feedback diode laser
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Measurements of OH radical concentration in combustion environments by wavelength-modulation spectroscopy with a 1.55-μm distributed-feedback diode laser

机译：使用1.55-μm分布式反馈二极管激光器通过波长调制光谱法测量燃烧环境中的OH自由基浓度

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摘要

Wavelength-modulation spectroscopy with a standard commercial 1.55-μm distributed-feedback diode laser was applied to in situ quantitative measurements of OH radical concentration in combustion environments. The second-harmonic (2f) signal was generated from absorption by the P11.5 (v', v") = (2, 0) overtone vibrational transition of OH at 6421.354 cm_(-1). The absorption occurred in the postflame region of a two-dimensional laminar counterflow burner (Tsuji burner) with a 60-mm line-of-sight path length. The postfiame region lies between propane-air premixed twin flames stabilized in the Tsuji burner at various equivalence ratios (φ = 0.65-1.0). The OH concentrations were determined by least-squares fitting of theoretical 2f line shapes to the experimental counterparts. The measured OH concentrations were in general agreement with adiabatic chemical equilibrium predictions. The lower limit of OH detectivity by multiline deconvolution was limited by ubiquitous unidentified high-temperature H_(2)O transitions.
机译：使用标准的商用1.55-μm分布式反馈二极管激光器进行波长调制光谱，以现场定量测量燃烧环境中的OH自由基浓度。通过在6421.354 cm _（-1）处OH的P11.5（v'，v“）=（2，0）泛音振动跃迁吸收产生二次谐波（2f）信号。吸收发生在火焰后区域视线长度为60毫米的二维层流逆流燃烧器（Tsuji燃烧器），后火焰区域位于Tsuji燃烧器中稳定的丙烷-空气预混双火焰之间，并具有不同的当量比（φ= 0.65- 1.0）。通过理论上的2f线形与实验对应物的最小二乘拟合确定OH浓度。测得的OH浓度与绝热化学平衡预测基本吻合。多线反褶积法检测OH的下限受到普遍存在的限制。未确定的高温H_（2）O跃迁。

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