开发一个腔环下降光谱仪,以实现多种物种组成
Luís Felipe F M Barbosa1, Philip B Dubowik1, Manuel A Reddemann1
1Institute of Heat and Mass Transfer, RWTH Aachen University, Augustinerbach 6, Aachen 52062, Germany.
The Review of scientific instruments
|October 30, 2023
概括
一种新的腔环下降光谱仪 (CRDS) 以高灵敏度检测到一氧化碳 (CO) 和氧化 (NO) 等空气污染物. 这种CRDS系统提供了一种无校准的SI可追溯方法来分析气体混合物,为催化研究铺平了道路.
科学领域:
- 频谱学是一种光谱学.
- 环境科学 环境科学
- 分析化学 分析化学
背景情况:
- 空气污染监测需要对关键分子进行敏感检测.
- 腔环向下光谱 (CRDS) 为气体分析提供了高灵敏度.
- 现有的CRDS系统在波长覆盖或校准方面可能存在局限性.
研究的目的:
- 开发和演示用于检测空气污染物的多功能CRDS.
- 为验证一种无校准,SI可追溯的气体分析后处理方法.
- 探索异质催化研究中的未来应用.
主要方法:
- 开发使用定制镜 (99.99%反射率) 的CRDS系统,用于广泛波长 (1.521.80μm) 的覆盖.
- 在1.79微米时检测氧化 (NO) 和在1.58微米时一氧化碳 (CO) 的ro-振动转换.
- 应用后处理程序来确定多种气体混合物中的摩尔分数.
主要成果:
- 实现了1.1 × 10-10 cm-1的最小可检测的吸收率,整合时间为1.2秒.
- 在1.79微米的环境空气中成功检测到NO转变,在1.58微米的环境空气中成功检测到CO2/水蒸气.
- 证明了气体混合物分析后处理方法的无校准性和SI可追溯性.
结论:
- 开发的CRDS对空气污染监测具有高度敏感性和多功能性.
- 无校准后处理方法对于多种气体分析是有效的.
- 该CRDS系统对未来在异质催化和反应监测方面的研究具有前景.
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