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首页> 外文期刊>Applied Spectroscopy: Society for Applied Spectroscopy >Development and Metrological Characterization of a Tunable Diode Laser Absorption Spectroscopy (TDLAS) Spectrometer for Simultaneous Absolute Measurement of Carbon Dioxide and Water Vapor
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Development and Metrological Characterization of a Tunable Diode Laser Absorption Spectroscopy (TDLAS) Spectrometer for Simultaneous Absolute Measurement of Carbon Dioxide and Water Vapor

机译：同时测量二氧化碳和水蒸气的可调谐二极管激光吸收光谱仪（TDLAS）的研制和计量学表征

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Simultaneous detection of two analytes, carbon dioxide (CO2) and water vapor (H2O), has been realized using tunable diode laser absorption spectroscopy (TDLAS) with a single distributed feedback diode laser at 2.7 mu m. The dynamic range of the spectrometer is extended from the low parts per million to the percentage range using two gas cells, a single-pass cell with 0.77 m, and a Herriott-type multipass cell with 76 m path length. Absolute measurements were carried out, i.e., amount fractions of the analytes were calculated based on previously determined spectral line parameters, without the need for an instrument calibration using gas standards. A thorough metrological characterization of the spectrometer is presented. We discuss traceability of all parameters used for amount fraction determination and provide a comprehensive uncertainty assessment. Relative expanded uncertainties (k=2, 95% confidence level) of the measured amount fractions are shown to be in the 2-3% range for both analytes. Minimum detectable amount fractions are 0.16 tunol/mol for CO2 and 1.1 gmol/mol for H2O for 76 m path length and 5 s averaging time. This corresponds to normalized detection limits of 27 gmol/mol m Hz(-1/2) for CO2 and 22 mu mol/mol m Hz(-1/2) for H2O. Precision of the spectrometer, determined using Allan variance analysis, is 3.3 nmol/mol for CO2 and 21 nmol/mol for H2O. The spectrometer has been validated using reference gas mixtures with known CO2 and H2O amount fractions. An application example of the absolute TDLAS spectrometer as a reference instrument to validate other sensors is also presented.
机译：使用可调谐二极管激光吸收光谱法（TDLAS）和一个2.7μm的单个分布式反馈二极管激光器，可以同时检测两种分析物，即二氧化碳（CO2）和水蒸气（H2O）。使用两个气室，一个0.77 m的单通池和一个76 m路径长度的Herriott型多通池，将光谱仪的动态范围从百万分之几扩大到百分比范围。进行绝对测量，即，基于先前确定的谱线参数计算分析物的含量分数，而无需使用气体标准进行仪器校准。介绍了光谱仪的全面计量特性。我们讨论了用于含量分数确定的所有参数的可追溯性，并提供了全面的不确定性评估。对于两种分析物，测得的量分数的相对扩展不确定度（k = 2，95％置信度）显示在2-3％的范围内。对于76 m的路径长度和5 s的平均时间，最小可检测量分数是CO2为0.16 tunol / mol和H2O为1.1 gmol / mol。这对应于归一化检测极限，对于CO2为27 gmol / mol m Hz（-1/2），对于H2O为22μmol/ mol m Hz（-1/2）。使用Allan方差分析确定的光谱仪精度对于CO2为3.3 nmol / mol，对于H2O为21 nmol / mol。光谱仪已使用具有已知CO2和H2O量分数的参比气体混合物进行了验证。还介绍了绝对TDLAS光谱仪作为验证其他传感器的参考仪器的应用示例。

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