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首页> 外文会议>Next-Generation Spectroscopic Technologies X >Versatile, ultra-low sample volume gas analyzer using a rapid, broad-tuning ECQCL and a hollow fiber gas cell
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Versatile, ultra-low sample volume gas analyzer using a rapid, broad-tuning ECQCL and a hollow fiber gas cell

机译：使用快速，宽调谐ECQCL和中空纤维气室的多功能超低样品量气体分析仪

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摘要

We describe a versatile mid-infrared (Mid-IR) spectroscopy system developed to measure the concentration of a wide range of gases with an ultra-low sample size. The system combines a rapidly-swept external cavity quantum cascade laser (ECQCL) with a hollow fiber gas cell. The ECQCL has sufficient spectral resolution and reproducibility to measure gases with narrow features (e.g., water, methane, ammonia, etc.), and also the spectral tuning range needed to measure volatile organic compounds (VOCs), (e.g., aldehydes, ketones, hydrocarbons), sulfur compounds, chlorine compounds, etc. The hollow fiber is a capillary tube having an internal reflective coating optimized for transmitting the Mid-IR laser beam to a detector. Sample gas introduced into the fiber (e.g., internal volume = 0.6 ml) interacts strongly with the laser beam, and despite relatively modest path lengths (e.g., L ~ 3 m), the requisite quantity of sample needed for sensitive measurements can be significantly less than what is required using conventional IR laser spectroscopy systems. Example measurements are presented including quantification of VOCs relevant for human breath analysis with a sensitivity of ~2 picomoles at a 1 Hz data rate.
机译：我们描述了一种通用的中红外（Mid-IR）光谱系统，该系统开发用于以超低样品量测量多种气体的浓度。该系统将快速扫描的外腔量子级联激光器（ECQCL）与中空纤维气室结合在一起。 ECQCL具有足够的光谱分辨率和重现性，可测量特征较窄的气体（例如水，甲烷，氨等），还具有测量挥发性有机化合物（VOC）所需的光谱调谐范围（例如醛，酮，中空纤维是具有内部反射涂层的毛细管，该内部反射涂层经过优化，可将中红外激光束传输到检测器。引入光纤的样品气体（例如，内部体积= 0.6 ml）与激光束强烈相互作用，尽管光程长度相对较小（例如，L〜3 m），但敏感测量所需的样品量却可能大大减少比使用常规红外激光光谱仪系统所要求的要高。给出了示例测量，包括与人类呼吸分析相关的VOC的量化，在1 Hz数据速率下的灵敏度约为2皮摩尔。

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