Fiber Bragg grating high-temperature sensing system based on improved support degree matrix model

In order to improve the detection accuracy of high-temperature resistant sensing network and optimize its performance,a fiber Bragg grating(FBG) high-temperature sensing system based on improved support degree matrix model is developed.A high precision and reliability sensing network structure is designed to improve the poor performance of the traditional FBG sensing network.An improved support degree matrix data fusion model is established on the basis of multi-sensor data fusion principle to fuse raw temperature data.Experimental results show that the total absolute temperature estimated error of the new system is 0.220 ℃ when the experimental temperature is 290 ℃,and the accuracy of the system is ±0.2 ℃ within the range from 20 ℃ to 290 ℃;the fluctuation range of estimated value is small;the robustness of the established data fusion model is good and the system is steady enough to measure temperature when a sensor fails.Obtained results indicate that the sensing system has advantages of high precision,good reliability and strong anti-jamming,which can be used in the practical projects for temperature measurement.