AI Article Synopsis
- A measurement scheme using tunable diode laser spectroscopy was developed to accurately detect water vapor concentrations, unaffected by scattering from non-water particles in a humidity chamber.
- The technique measures relative water vapor concentration at a specific transition band using a 938 nm distributed feedback diode laser across various temperatures.
- Experimental results demonstrate that the water vapor concentrations obtained are consistent and independent of the amount of scattering caused by dust particles.
Article Abstract
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.
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| http://dx.doi.org/10.1016/j.saa.2008.10.022 | DOI Listing |
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