Capillary liquid-core optical fiber temperature sensor based on fluorescence intensity ratio
Aiming to the problem of the complicated preparation of existing optical fiber fluorescence tem-perature sensing probes,we propose a simple,cost-effective,and high-performance optical fiber fluores-cence temperature sensor based on a capillary liquid core.Firstly,a mixed solution consisting of temperature-sensitive rhodamine B and temperature-insensitive rhodamine 123 was used as the temperature-sensitive ma-terial and encapsulated in a stainless-steel capillary to prepare a sensing probe.The ratio of the fluorescence emission peak intensities of the two dyes was utilized for temperature sensing.Subsequently,the sensing probe's mixed solution concentration and capillary structural parameters were optimized.Then,the perform-ance of the sensor was tested.Finally,the sensor was applied to real-life temperature measurements.The ex-perimental results demonstrate that the sensor has a temperature response range of 30-70℃ and that there is a quadratic correlation between the fluorescence intensity ratio and the temperature,with the fitted correla-tion coefficient as high as 0.9984.The sensor exhibits excellent accuracy,repeatability,and stability,with more than three months of service time.Moreover,it can be well-utilized to detect temperature in daily life.The optical fiber fluorescence temperature sensor shows significant potential for real-time monitoring and re-mote detection applications.
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