Method of Measuring the Spectral Shape of the Radiation Line of a Three‐Micron Long‐Path Laser Gas Analyzer

Ivanov, S.V.; Panchenko, V. Ya.
July 2004
Journal of Applied Spectroscopy;Jul/Aug2004, Vol. 71 Issue 4, p580
Academic Journal
A new method to experimentally determine the spectral shape of the radiation line of a tunable long‐path absorption laser gas analyzer operating in a three‐micron range (λ = 2.5–4.5 μm) on the basis of a difference‐frequency generator is suggested. The method is based on measurement of the transmission function of a gas medium upon modulation of its optical thickness or pressure. Specific vibrational–rotational transitions and also optimal pressures of CO2, N2O, and CH4 are recommended for carrying out experiments.


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