Optical fluorescent hygrometer for water vapor low concentration measurements

Vladimir Yushkov; Alexander Lukjanov; Serafim Merkulov; Mikhail Khaplanov; Ludmila Shyshatzkaya; Jorg Gumbel

doi:10.1117/12.221083

20 September 1995 Optical fluorescent hygrometer for water vapor low concentration measurements

Vladimir Yushkov, Alexander Lukjanov, Serafim Merkulov, Mikhail Khaplanov, Ludmila Shyshatzkaya, Jorg Gumbel

Proceedings Volume 2506, Air Pollution and Visibility Measurements; (1995) https://doi.org/10.1117/12.221083
Event: European Symposium on Optics for Environmental and Public Safety, 1995, Munich, Germany

Abstract

An optical hygrometer has been developed to make night-time measurements of water vapor in the upper atmosphere using the technique of photofragment fluorescence. Hygrometer uses the fluoroscence at wavelengths near 310 nm of excited OH molecules produced in the photodissociation of water molecules by UV radiation with hydrogen lamp (121.6 nm). A coaxial optical scheme is used. A compact hydrogen lamp is aligned along the axis of the instrument, inside the annular fast focusing optics. It provides the effective convergence of fluorescence from a large angle and thus increase the sensitivity of this method. The modulation of the hydrogen lamp with the frequency 1 kHz is used. Specially designed laboratory technique for calibration of the hygrometer is described. Total weight of the optical hygrometer is about 3 kg. It can be easily integrated with the Vaisala RS-80 radio sonde. This allows us to obtain reliable real-time data on temperature, pressure, and water vapor concentrations in the upper troposphere and stratosphere.

Citation Download Citation

Vladimir Yushkov, Alexander Lukjanov, Serafim Merkulov, Mikhail Khaplanov, Ludmila Shyshatzkaya, and Jorg Gumbel "Optical fluorescent hygrometer for water vapor low concentration measurements", Proc. SPIE 2506, Air Pollution and Visibility Measurements, (20 September 1995); https://doi.org/10.1117/12.221083

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