A METHOD FOR DETERMINING GASEOUS IMPURITIES IN THE ATMOSPHERE USING STEPWISE FREQUENCY MODULATION OF A DIODE LASER
N.E. Dultsev, E.N. Chesnokov, P.V. Koshlyakov
Institute of Chemical Kinetics and Combustion, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: IR spectroscopy, DFB laser, methane
Abstract
The paper considers the possibility of creating an automated device for detecting methane (CH4) in the atmosphere based on tunable diode infrared absorption spectroscopy using stepwise frequency modulation of laser radiation. A feedback diode laser (DFB) operating at a wavelength of 1653 nm was used as the radiation source. The optimal value of the modulation amplitude has been determined. The possibility of detecting methane in concentrations from 6 ppm for an optical path of 60 cm is demonstrated.
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