31 January 2002 Measurement of water vapor fluctuation with a laser absorption spectrometry system having anti-scintillation performance
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Abstract
In the laser absorption spectrometry (LAS) system with the open atmosphere, scintillation caused by the atmospheric turbulence is the principal interference for the system accuracy. However, the scintillation could be used for monitoring of the gas flux because it includes the information of the flow of the atmosphere. Therefore we developed a LAS system and attempted to monitor both the water vapor density and the scintillation simultaneously and individually. In the system, the scan time for the absorption lines is set shorter than the principal fluctuation period of the scintillation for reducing the influence of the scintillation. Based on the actual data about temporal sequence of transmittance for the laser beam through the target air, it was found that the scintillation was almost frozen if the time for spectral scanning was done within about 0.1 second. With this scan time, some indoor experiments were carried out and their data were split into the absolute absorption of the water vapor and the scintillation with numerical filters. As the results, actual fluctuation data of the water vapor density buried under the scintillation noise appeared, and the correlation between the fluctuation of the water vapor and the scintillation was able to be estimated.
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Naoki Kagawa, Osami Wada, Ryuji Koga, "Measurement of water vapor fluctuation with a laser absorption spectrometry system having anti-scintillation performance", Proc. SPIE 4539, Remote Sensing of Clouds and the Atmosphere VI, (31 January 2002); doi: 10.1117/12.454427; https://doi.org/10.1117/12.454427
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