An optical fiber temperature sensor based on fluorescence intensity ratio used for real-time monitoring of chemical reactions

An all-optical temperature sensor based on a fluorescence intensity ratio suitable for real-time monitoring of temperature in chemical reaction processes is proposed and experimentally demonstrated. The sensor can be used for online real-time measurement of the temperature of a chemical reaction system in a small and complex environment. The sensor probe was made of Er3+/Yb3+ co-doped TeO2–WO3–Na2O–ZnF2–Nb2O5 glass and combined with an all-optical sensor system using a discharge melting method. By making different Er3+/Yb3+ concentrations of glass, Er3+/Yb3+ co-doped TeO2–WO3–Na2O–ZnF2–Nb2O5 glass with the best luminescence intensity was explored, and the influence of different excitation powers on the sensing of high-power excitation light material sensing was analyzed. The thermal and optical properties of the material were analyzed, and the possibility of using it as a temperature sensor material was discussed experimentally and theoretically. The maximum temperature sensitivity of the sensor is 0.0067 K-1. Finally, it was applied in the actual chemical reaction.