Selection of spectral regions for remote gas analysis using a broadband source

Authors: Kalashnikova V.A.
Published in issue: #10(63)/2021
DOI: 10.18698/2541-8009-2021-10-739
Category: Instrument Engineering, Metrology, Information-Measuring Instruments and Systems | Chapter: Laser and opto-electronic systems
Keywords: environmental monitoring, remote gas analysis, pollutants, gas transmission, concentration, spectrum, broadband radiation source, mathematical modeling
Published: 15.10.2021

An important task of environmental monitoring is to determine the concentration of atmospheric pollutants. The main problem that arises when using a broadband radiation source is the impossibility of analytical determination of gas concentrations from the results of attenuation measurements along the sounding path. In this article, mathematical modeling has been carried out. It is shown that for many atmospheric pollutants there are spectral regions for which, with an acceptable error, a transition from the exact equation (a system of equations in the case of a multicomponent gas mixture) to an approximate analytical expression is possible. The dependence of the maximum error arising in the transition from the exact formula to the approximate one on the concentration of the gas under study is estimated.

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