Abstract
In this paper, a novel integrated sensing structure based on double quartz tubes stepped fiber grating is proposed, which can effectively solve the measurement inaccuracy problem caused by the traditional fiber Bragg grating (FBG) sealing process. Based on thermoelasticity theory, a mathematical model of the temperature sensing performance of the proposed integrated stepped FBG sensing structure is established, and the structural and material influencing parameters of its sensing performance are investigated by combining with Comsol 6.0 simulation; meanwhile, a sample of the proposed integrated stepped FBG sensing structure is prepared, and the temperature sensing performance is tested by temperature sensing experiments, the temperature sensitivity can reach 35.84pm/ °C, and the temperature resolution is 0.030 °C/pm, which is better than that of the metallized FBG (15.91pm/ °C), and verifies the validity of the theoretical model of the temperature sensing performance of the proposed integrated stepped FBG sensing structure. Finally, the temperature cycling response experiment verifies that the sensing structure based on double quartz tubes stepped fiber grating proposed in this paper can effectively improve the temperature sensing performance of FBG based on effectively solving the problems of the traditional adhesive sealing process.
Published Version
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