Application of a Differential Fuel-Cell Analyzer for Measuring Atmospheric Oxygen Variations
Application of a Differential Fuel-Cell Analyzer for Measuring Atmospheric Oxygen Variations
复制标题
应用差分燃料电池分析仪测量大气氧气变化
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
D. Baumann
中科院分区：
文献类型：
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作者：
B. Stephens;P. Bakwin;P. Tans;R. Teclaw;D. Baumann
摘要市售的差分燃料电池分析仪已被改编为基于现场的ppm级测量大气中的O2变化。通过实施快速校准和主动压力和流量控制，本文所述的分析系统在2分钟测量中的1σ精度为±2.5/meg（≤ 0.5 ppm）。为了在切换进样管线后保持系统稳定，每隔20分钟可进行6分钟的测量，精度为±1.4/meg（≤ 0.3 ppm）。消除任何大气O2测量中的偏差主要取决于仔细的气体处理程序，并且在筛选已知偏差来源后，估计与当前设置的可比性为±10/mcg（102 ppm）。与现有技术相比，燃料电池分析仪相对小的尺寸、低成本、快速响应、运动不敏感性和易于实施使其特别适用于广泛的无人值守现场应用。该系统已被用于测量…
Abstract A commercially available differential fuel-cell analyzer has been adapted to make field-based ppm-level measurements of atmospheric O2 variations. With the implementation of rapid calibrations and active pressure and flow control, the analysis system described here has a 1σ precision of ±2.5 per meg (≈0.5 ppm) for a 2-min measurement. Allowing for system stabilization after switching inlet lines, a 6-min measurement with a precision of ±1.4 per meg (≈0.3 ppm) every 20 min is obtained. The elimination of biases in any atmospheric O2 measurement depends critically on careful gas-handling procedures, and after screening for known sources of bias a comparability of ±10 per meg (≈2 ppm) with the present setup is estimated. In comparison to existing techniques, the relatively small size, low cost, fast response, motion insensitivity, and ease of implementation of the fuel-cell analyzer make it particularly useful for a wide range of unattended field applications. This system has been used to measure at...