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A set up to detect the absorption lines of atmospheric gas molecules

机译：用于检测大气气体分子吸收线的装置

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摘要

Due to the importance of carrying out practical and accurate measurements of atmospheric gases, we built and characterized a system to detect the absorption lines of these gases. The proposed set up consists of tunable diode laser with an external cavity designed by Littrow configuration (TDL) as light source, multipass cell with absorption path length of 30 m, and a monochromator with photomultiplier tube as detector. In this work we did not adjust the laser to emit in a single mode to get maximum number of absorption lines within scanning range simultaneously. The used setup gives us the possibility for changing few parameters for tuning the diode laser which gives clear advantage of commercial equipment with limited tunability. Due to its important environmental role we investigated CO_2 absorption lines in the weak band of IR region near 1600 nm, as a test case for using the proposed set up. Despite the fact that absorption lines of CO_2 near 1600 nm are weak using the proposed setup we were able to reliably detect them with a good accuracy when compared to known theoretical and experimental results listed in literature and databases as HITRAN 2008 database.
机译：由于进行实际和准确的大气气体测量非常重要，因此我们构建并表征了检测这些气体吸收线的系统。拟议的装置包括一个由Littrow配置（TDL）设计的带有外部腔的可调谐二极管激光器作为光源，吸收路径长度为30 m的多通道单元以及一个以光电倍增管作为检测器的单色仪。在这项工作中，我们没有将激光器调整为以单一模式发射，以在扫描范围内同时获得最大数量的吸收线。所使用的设置使我们可以更改很少的参数来调谐二极管激光器，这明显带来了商用设备的可调谐性有限的优势。由于其重要的环境作用，我们研究了在1600 nm附近的IR区弱带中的CO_2吸收谱线，作为使用该建议装置的测试案例。尽管使用提出的设置，CO_2附近的吸收线很弱，但与文献和数据库（如HITRAN 2008数据库）中列出的已知理论和实验结果相比，我们仍能够可靠地以良好的精度检测它们。

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