DIGITAL TWIN OF THE FABRY-PEROT SENSOR FOR GREENHOUSE GAS CONCENTRATION MONITORING
The paper presents a mathematical model of a Fabry-Perot fiber-optic sensor implemented at the end of an optical fiber by depositing a thin polymer film sensitive to the concentration of greenhouse gases. Verification of the mathematical model with the results of full-scale experiments and data of other authors was carried out in order to use it as a digital twin of the sensitive element of the sensor. The numerical and natural experiments carried out made it possible to draw a conclusion about the prospects for the use of fiber-optic Fabry-Perot sensors for monitoring and analyzing the concentration of greenhouse gases (carbon dioxide, methane and nitrous oxide) in the atmosphere with an appropriate choice of the absorbing material of the sensitive element. It is shown that the really achievable limit of resolution makes it possible to determine the change in the dielectric constant of a polymer film in the fourth decimal place.