Simultaneous measurement of temperature and liquid refractive index based on fiber open Fabry-Pérot cavity and Bragg grating
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Abstract:
A temperature and refractive index sensor based Fiber Bragg Grating (FBG) end surface cascade open Fabry-P?rot (FP) cavity has been designed and demonstrated experimentally. The open FP cavity has been fabricated on the end face of a FBG by dislocation fusion in this work, the open FP cavity could be used for refractive index sensing, the temperature is measured by cascading a FBG. The working principle of the sensor and the method of improving the sensitivity are analyzed by theoretical simulation. The refractive index sensitivity of the sensor is 1108.4nm/RIU, while the maximum fluctuation of the sensor stability experiment detection is 0.005nm, the results show that it has satisfactory characteristics. The sensor is a compact all-fiber structure, so it has potential applications in the field of temperature refractive index sensing, such as biomedical, capacitor electrolyte detection.
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This work was supported in part by Funding National Natural Science Foundation of China (Nos.61735014, 61927812), in part Shaanxi Provincial Education Department (No.18JS093), in part Operation Fund of Logging Key Laboratory of Group Company (2021DQ0107-11) and in part Graduate Student Innovation Fund of Xi’an Shiyou University (YCS23213178, YCS22213185).
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