In order to realize the direct temperature measurement in strong electromagnetic and other special high temperature environments,a novel,simple and low-cost optical fiber high-temperature temperature detection system is proposed and demonstrated.The system uses the strong feedback of Fabry-Perot laser diode(FP-LD)to detect the temperature of reflected fiber in real-time.The sensing system consists of a communication laser source,FP-LD,a fiber-optic ring mirror,Sagnac,and a photoelectric detector(PD).The system is used to realize the high temperature temperature sensing in the temperature range of 105～1025 ℃.The experimental results show that the frequency deviation of the strong feedback beat frequency signal(BFS)is linear with the temperature change in the softening temperature of the fiber,which can be widely used for high temperature detection in metallurgy,aerospace and other fields.
关键词
强反馈/法布里-珀罗激光二极管/光纤Sagnac环/拍频信号
Key words
strong feedback/Fabry-Perot laser diode(FP-LD)/fiber-optic Sagnac ring/beat frequency signal(BFS)
维普
万方数据