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首页> 外文会议>Conference on 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：多功能，超低样品体积气体分析仪使用快速，广泛调整的ECQCL和中空纤维气体电池

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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：我们描述了一种开发的多功能中红外（中红外）光谱系统，以测量具有超低样品尺寸的各种气体的浓度。该系统将快速扫过的外腔量子级联激光器（ECQCL）与中空纤维气体电池组合。 ECQCL具有足够的光谱分辨率和再现性，以测量具有窄特征（例如，水，甲烷，氨等）的气体，并且还测量挥发性有机化合物（VOC）的光谱调谐范围（例如，醛，酮，烃类），硫化合物，氯化合物等。中空纤维是具有用于将中红外激光束传输到检测器的内反射涂层的毛细管。引入纤维的样品（例如，内部体积= 0.6mL）用激光束强烈地相互作用，尽管有相对适度的路径长度（例如，L〜3 M），但敏感测量所需的必要量可以显着较小比使用常规IR激光光谱系统所需的。提出了示例测量，包括对人类呼吸分析相关的VOC的量化，其敏感性为1 Hz数据速率。

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