Addressed Combined Fiber-Optic Sensors as Key Element of Multisensor Greenhouse Gas Monitoring Systems

Area of Science:

• Optoelectronics and Sensor Technology
• Environmental Monitoring
• Greenhouse Gas Detection

Background:

• Traditional fiber-optic sensors face limitations in cost and metrological performance.
• Developing advanced sensing systems for accurate greenhouse gas monitoring is crucial.

Purpose of the Study:

• To investigate the design and application of addressed combined fiber-optic sensors (ACFOSs) for multisensory greenhouse gas concentration control.
• To propose a novel structural scheme for a multisensory gas concentration monitoring system.

Main Methods:

• Development of combined fiber-optic sensors (CFOSs) integrating fiber Bragg gratings (FBGs) or addressed fiber Bragg structures (AFBSs) with Fabry-Perot resonators (FPRs).
• Utilizing microwave photonics interrogating methods for cost-effective sensing.
• Application of Karhunen-Loève transform (KLT) for spectral component separation.
• Employing polymer films of varying materials and thicknesses as FPR sensitive elements.

Main Results:

• The proposed ACFOS design enables the detection of four greenhouse gases (CO2, NO2, CH4, Ox) with high accuracy.
• The system demonstrates accurate environmental temperature measurement (-60 to +300 °C) with 0.1-0.01 °C accuracy.
• Gas concentration is measured within the range of 10-90% with 0.1-0.5% accuracy.
• The use of AFBSs instead of FBGs significantly reduces system cost while enhancing metrological characteristics.

Conclusions:

• The developed ACFOS and multisensory system offer a cost-effective and highly accurate solution for greenhouse gas and temperature monitoring.
• The integration of AFBSs and KLT provides a robust method for analyzing spectral data and determining gas concentrations.
• This technology has significant potential for environmental monitoring and industrial control applications.