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- W2062000119 abstract "Abstract At present monitoring of dangerous atmospheric pollutant the gaseous HF is a very important ecological problem. The chemical method of the analisis which is used today is time — consuming, and doesn't allow to carry out a continuous control of HF concentration. The laser method based on the selective absorption of He-Ne laser's radiation with wave length λ=2,3951 μk by HF molecules (line 1R5) has no defects mentioned above. The absorption cross-section of the laser radiation σHF is 2,35·10−17 cm−2 at the low pressure (≤10 torr) of a gaseous mixure and is 2,0·10−18 cm−2 in the presence of nitrogen at 760 torr [1]. Similarly, the cross-section σ for the molecules H20, carbon, sulphur, nitrogen oxides, hydrocarbons a.o is by 5–6 orders less. We have made two types of gas analyzer models to determine HF concentration: 1) in the air of production premises— “Ecofluorine” 2) in technological and released gases— “Technofluorine”. These two devices operate in the condition of flow of gas under a cell. A multipass optical cell with maximum lenght of 70 m is used in the first gas analyzer, the range of measurements being 0,05÷10 mg.m−3. The second model makes it possible to measure HF content in technological gases under the 1–760 torr at the level of 5.10−4 ÷ 2,0% (vol.) and in gases released at the atmospheric pressure in the range of 1,0 ÷ 50 mg·m−3." @default.
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- W2062000119 date "1991-09-01" @default.
- W2062000119 modified "2023-09-27" @default.
- W2062000119 title "The HF laser absorption gas analizer" @default.
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- W2062000119 doi "https://doi.org/10.1016/s0022-1139(00)83851-8" @default.
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