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用于行星进入激波诱导热非平衡研究的一氧化碳高速中红外激光吸收光谱法。

High-speed mid-infrared laser absorption spectroscopy of CO for shock-induced thermal non-equilibrium studies of planetary entry.

作者信息

Jelloian Christopher C, Minesi Nicolas Q, Spearrin R Mitchell

机构信息

Department of Mechanical and Aerospace Engineering, University of California, Los Angeles (UCLA), CA 90095 USA.

出版信息

Appl Phys B. 2022;128(12):216. doi: 10.1007/s00340-022-07934-4. Epub 2022 Nov 15.

DOI:10.1007/s00340-022-07934-4
PMID:36407910
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9666324/
Abstract

A high-speed laser absorption technique is employed to resolve spectral transitions of CO in the mid-infrared at MHz rates to infer non-equilibrium populations/temperatures of translation, rotation and vibration in shock-heated CO - Ar mixtures. An interband cascade laser (DFB-ICL) resolves 4 transitions within the CO asymmetric stretch fundamental bands ( v = 1) near 4.19 . The sensor probes a wide range of rotational energies as well as two vibrational states (00 0 and 01 0). The sensor is demonstrated on the UCLA high enthalpy shock tube, targeting temperatures between 1250 and 3100 K and sub-atmospheric pressures (up to 0.2 atm). The sensor is sensitive to multiple temperatures over a wide range of conditions relevant to Mars entry radiation. Vibrational relaxation times are resolved and compared to existing models of thermal non-equilibrium. Select conditions highlight the shortcomings of modeling CO non-equilibrium with a single vibrational temperature.

摘要

采用一种高速激光吸收技术，以兆赫兹速率解析中红外波段CO的光谱跃迁，从而推断冲击加热的CO - Ar混合物中平动、转动和振动的非平衡粒子数/温度。一种带间级联激光器（分布反馈 - ICL）解析了在4.19附近CO不对称伸缩基频带（(v_3 = 1)）内的4个跃迁。该传感器探测了广泛的转动能量以及两个振动态（000和010）。该传感器在加州大学洛杉矶分校高焓激波管上进行了演示，目标温度为1250至3100 K，压力低于大气压（最高0.2 atm）。该传感器在与火星进入辐射相关的广泛条件下对多种温度敏感。解析了振动弛豫时间，并与现有的热非平衡模型进行了比较。特定条件凸显了用单一振动温度模拟CO非平衡的不足之处。

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本文引用的文献

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Heavy Particle Impact Vibrational Excitation and Dissociation Processes in CO.一氧化碳中重粒子碰撞振动激发与解离过程
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Accurate calculated tabulations of IR and Raman CO(2) line broadening by CO(2), H2O, N(2), O(2) in the 300-2400-K temperature range.300至2400K温度范围内，二氧化碳、水、氮气、氧气对红外和拉曼二氧化碳谱线展宽的精确计算表格。
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