Detection of moisture content in high-purity ammonia by means of diode-laser spectroscopy |
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| Authors: | AG Berezin AI Nadezhdinskii YY Ponurovskii DB Stavrovskii IE Vyazov AP Kotkov VA Ivanov ND Grishnova DM Polezhaev VA Sidorov DA Kotkov |
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| Institution: | (1) A.M. Prokhorov General Physics Institute of Russian Academy of Sciences, Vavilov Str. 38-L2, Moscow, 119991, Russia;(2) Scientific–Industrial Enterprise ‘Salut’, Larina Str. 7, Nizhnii Novgorod, 603950, Russia |
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| Abstract: | The aim of this work was the development of an as-simple-as-possible instrument for trace moisture concentration measurements
in high-purity ammonia. A near-infrared diode-laser-based instrument has been applied to measure the humidity in a process
of on-line detection of water in ammonia during industrial purification. The results of water concentration measurements were
compared with alternative techniques (primarily dew-point detection) and good agreement was achieved. The long-term sensitivity
of such a diode-laser-based instrument was estimated to be 5 ppm. The calculation of the water concentration from measurements
of the integrated volume of water contained in the heavy fraction, extracted during the purification process, yields an even
lower detection limit of less than 0.1 ppm, depending on the initial ammonia purity.
PACS 42.55.Px; 42.62.Cf; 42.62.Fi |
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