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Updated: Jul 12, 2025

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使用纳米秒激光诱导的等离子体检测分子氧气

Seon Woong Kim, Jongwun Choi, Hosung Byun

|October 20, 2023

概括

本研究使用激光诱导等离子体测量分子氧 (O2) 度. 一种新的方法检测了原子氧吸收线,使得即使在存在二氧化碳的情况下,也能够精确地确定O2分子分数.

科学领域:

等离子体物理学和光谱学
激光诱导分解光谱学 (LIBS) 是一种技术.
气相化学分析化学分析

背景情况:

在高温环境中测量分子氧 (O2) 度具有挑战性.
传统的激光诱导等离子体 (ns-LIP) 经常使分子分离,从而失去光谱信息.
其他分子如二氧化碳 (CO2) 的存在可能会干扰测量.

研究的目的:

开发一种使用ns-LIP量化O2分子分数的新方法.
为了克服等离子谱学中分子解离的局限性.
为了在 CO2 的存在下,在广泛的温度范围内 (3001000 K) 实现高精度的 O2 测量.

主要方法:

使用纳秒激光诱导等离子体 (ns-LIP) 用分离激光脉冲 (532 nm和1064 nm) 进行持续的紫外线辐射.
在777nm处分析过渡性原子氧吸收线,源自与等离子体相邻的光解离O2.
采用正确的直角分解 (POD) 和支向量回归 (SVR) 来进行数据分析和O2分子分数评估.

主要成果:

确定了原子氧吸收线作为O2分子分数的敏感指标.
证明了原子O信号受到二氧化碳度的微不足道影响.
实现了精确的O2摩尔分数测量,不确定性低于1%.

结论:

开发的ns-LIP技术为O2度测量提供了可靠的方法.
这种方法有效地利用原子氧吸收来规避分子解离问题.
这种方法为复杂气体混合物中的O2定量提供了高精度和选择性.

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