Park Haesung, Lee Kwangchil, Kang Gumin, Song Soonho, Jung Youngjean, Kim Kyoungsik, Bae Jinsu, Lee Jonghak, Park Hyoungkuk
School of Mechanical Engineering, Yonsei University, 262 Seongsanno, Seodaemun-gu, Seoul 120-749, Republic of Korea.
Spectrochim Acta A Mol Biomol Spectrosc. 2009 Apr;72(3):510-4. doi: 10.1016/j.saa.2008.10.022. Epub 2008 Oct 28.
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 2nu(1)+nu(3) 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.
基于采用直接吸收测量的可调谐二极管激光光谱技术，我们开发了一种可靠的测量方案，该方案能够精确检测水蒸气浓度，而不受观测湿度室内非水尘埃颗粒引起的散射（衰减）影响。利用可调谐二极管激光光谱技术，在不同温度下，通过938nm分布反馈二极管激光器在2ν(1)+ν(3)水蒸气跃迁带测量了相对水蒸气浓度。将这些相对水蒸气浓度转换为绝对水蒸气浓度，并且我们证实了不同温度下的实验结果始终与衰减无关。无论观测湿度室内非水尘埃颗粒引起的散射是高还是低，我们的测量系统都能给出一致的水蒸气浓度。
