Reliable optical measurement of water vapor in highly scattering environment.
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.
Park
Haesung
H
School of Mechanical Engineering, Yonsei University, 262 Seongsanno, Seodaemun-gu, Seoul 120-749, Republic of Korea.
Lee
Kwangchil
K
Kang
Gumin
G
Song
Soonho
S
Jung
Youngjean
Y
Kim
Kyoungsik
K
Bae
Jinsu
J
Lee
Jonghak
J
Park
Hyoungkuk
H
D003198:Computer Simulation; D004867:Equipment Design; D006813:Humidity; D054023:Lasers, Semiconductor; D055620:Optical Phenomena; D015203:Reproducibility of Results; D013054:Spectrophotometry, Atomic; D013227:Steam / Q000032:analysis*; D013696:Temperature
D013227:Steam