Reliable optical measurement of water vapor in highly scattering environment

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• 作者：Haesung Park ; Kwangchil Lee ; Gumin Kang ; Soonho Song ; Youngjean Jung ; Kyoungsik Kim ; Jinsu Bae ; Jonghak Lee ; Hyoungkuk Park
• 关键词：Tunable diode laser spectroscopy ; Water vapor ; High scattering media
• 刊名：Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
• 出版年：2009
• 出版时间：April 2009
• 年：2009
• 卷：72
• 期：3
• 页码：510-514
• 全文大小：619 K

文摘

Based on tunable diode laser spectroscopy with direct absorption measurement, we developed a reliable measurement scheme which can precisely detect water vapor concentration independent of the scattering (attenuation) caused by the non-water dust particles inside the observed humidity chamber. The relative water vapor concentration was measured at 2ν₁+ν₃ water vapor transition band by 938 nm distributed feed-back diode laser at different temperatures using the tunable diode laser spectroscopy technique. These relative water vapor concentrations are converted into the absolute water vapor concentrations and we confirmed that the experimental results at different temperatures are consistently independent of the attenuation. Our measurement system gives the consistent water vapor concentrations without regard to either high or low scattering caused by the non-water dust particles inside the observed humidity chamber.