A lecturer from the Department of Physics Publishes a Scientific Paper on the Application of an End-face Fiber-optic Gas Concentration Sensor, Based on a Fabry-Perot Interferometer

Publishing a Scientific Paper

Lecturer Dr. Safaa Mohammed Ridha from the Department of Physics published a scientific paper titled “Applicability limits of the end-face fiber-optic gas concentration sensor, based on a Fabry-Perot interferometer” in the Karbala International Journal of Modern Science, classified as Q1.
The research aimed to discover a new mathematical model for a fiber-optic sensor for gas analysis using a Fabry-Perot interferometer.
The research also included constructing and discovering a new mathematical model for a fiber-optic sensor for gas concentration analysis. The sensor was implemented as a Fabry-Perot interferometer on the end-face of an optical fiber by applying a thin polymer film whose transmittance depends on the concentration of the tested gas. It was found that changes in the properties of the optical fiber or the transmittance of the atmosphere primarily lead to a change in the contrast of the spectrum and do not change the period or wavelength shift of its comb. The study analyzed the effects of polymer film thickness, ambient temperature, and humidity on the Fabry-Perot spectrum, demonstrating the need for temperature and humidity compensation sensors. A method was developed to determine transmittance in narrow and broad ranges based on the comb period and wavelength shift of the Fabry-Perot reflectance spectrum.