SPECTRAL METHOD AND DEVICE FOR OPERATIVE DETERMINATION OF LOW CONCENTRATIONS OF NITROGEN AND OXYGEN IN GASEOUS MIXTURES WITH HELIUM

摘要

FIELD: methods for operative measurement of low concentrations of nitrogen (20...500 ppm) and oxygen (5...50 ppm) in the mixtures of gases of nitrogen, oxygen and helium.;SUBSTANCE: the intensities of the spectral lines of the excited gaseous mixed are measured and analyzed, simultaneously with measurement of the intensity of radiation of nitrogen and helium additionally measured is the intensity of radiation of atomic oxygen at nm, and the concentration of nitrogen and oxygen is calculated by formulas given in the description of the invention. The claimed device has a gas chamber with optical windows and a discharger connected to a high-frequency high-voltage source, pressure transducer, light filter passing the nitrogen radiation, photodiodes and a computer connected to them. In addition, the device uses an interference light filter at nm and an additional photodiode connected to it for recording the radiation of atomic oxygen, with the aid of which the concentration of oxygen and nitrogen in the gaseous mixed with helium is determined with due account made for radiation of nitrogen and helium.;EFFECT: provided simultaneous measurement of low concentrations of nitrogen and oxygen in gaseous mixed with helium at a pressure of 0.2 to 2.0 atm.