Oxygen Sensitivity of Krypton and Lyman-α Hygrometers
Oxygen Sensitivity of Krypton and Lyman-α Hygrometers
复制标题
氪和莱曼-α 湿度计的氧灵敏度
DOI：
--
复制
发表时间：
2003
期刊：
影响因子：
--
通讯作者：
H. D. Bruin
中科院分区：
文献类型：
--
作者：
A. Dijk;W. Kohsiek;H. D. Bruin
本文研究了氪气湿度计和莱曼-α湿度计的氧灵敏度。使用露点发生器和受控的氮/氧流量的消光系数的五个湿度计与三阶泰勒展开的朗伯-比尔定律周围的参考条件的氧气和水蒸气进行了测量。显热通量的串扰的潜热通量修正给出了作为波文比的函数。观察到的氧气灵敏度的扩散要求对每个设备进行单独的氧气校准。据发现，管之间的间隔是相对于氧灵敏度的关键参数。朗伯-比尔定律中与氧气相关的非线性比与水蒸气相关的非线性更强。当管之间的间隔从1.3 cm加倍到2.6 cm时，这导致在水蒸气灵敏度或多或少恒定的情况下氧灵敏度的强烈降低。这一特点是支持的敏感性分析…
Abstract The oxygen sensitivity of krypton and Lyman-α hygrometers is studied. Using a dewpoint generator and a controlled nitrogen/oxygen flow the extinction coefficients of five hygrometers associated with the third-order Taylor expansion of the Lambert–Beer law around reference conditions for oxygen and for water vapor were measured. Latent heat flux corrections for cross-talk of the sensible heat flux are given as a function of the Bowen ratio. The spread observed in oxygen sensitivities calls for individual oxygen calibrations for each apparatus. It is found that the separation between the tubes is the crucial parameter with respect to the oxygen sensitivity. The oxygen-related nonlinearities in the Lambert–Beer law are stronger than those associated with water vapor. This leads to a strong reduction of the oxygen sensitivity at a more or less constant water vapor sensitivity when the separation between the tubes is doubled from 1.3 to 2.6 cm. This characteristic is supported by a sensitivity analysi...