FP cavity and FBG cascaded optical fiber temperature and pressure sensor
A fiber Bragg grating (FBG) and Fabry–Perot (FP) cavity cascaded fiber sensing system was manufactured for temperature and pressure sensing. Temperature sensing as high as 175°C was performed by an FBG for the linear variation of an FBG wavelength with temperature. After the temperature was sensed, the demodulation system can find the original FP cavity length and its pressure and cavity length correlation coefficient; thus, the ambient pressure would be calculated. The sensing pressure can be as high as 100 MPa with a repeatability of 1/10,000 and high stability. This kind of fiber sensor has been used in the Shengli Oil Field.
基金项目：This work was supported by the National Natural Science Foundation of China (No. 61605102) and the Taishan Scholar Program (No. tsqn20161061). Many thanks to Professor Gangding Peng from the University of New South Wales, Australia for his meaningful instruction during our experiments and Xiaohui Liu from the Laser Institute of Qilu University of Technology (Shandong Academy of Sciences) for his help in discussions.
Qingchao Zhao：Laser Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250103, China
Shaodong Jiang：Laser Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250103, China
Jiasheng Ni：Laser Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250103, China
Chang Wang：Laser Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250103, China
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Hui Li, Qingchao Zhao, Shaodong Jiang, Jiasheng Ni, Chang Wang, "FP cavity and FBG cascaded optical fiber temperature and pressure sensor," Chinese Optics Letters 17(4), 040603 (2019)