Study on carbon dioxide concentration sensor with fiber Bragg grating

In this work, we introduced a polymer-based fiber Bragg grating sensor for carbon dioxide (CO₂). The device integrates a polymer coating on the fiber Bragg grating sensor as a CO₂-sensitive region, and then a hydrophobic zeolite is coated on the surface to isolate water vapor interference. To eliminate the effect of temperature on the sensor detection performance, an uncoated fiber Bragg grating was introduced as a temperature compensation unit. Then, a CO₂ detection system was constructed to simulate the carbon sequestration environment to calibrate the CO₂ concentration for sensors and to analyze the sensor performance under different environmental conditions. The experimental analysis shows that the fiber Bragg grating CO₂ sensor not only has high CO₂ sensitivity, but also has excellent reversibility and stability in high temperature and high humidity environments.