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Chin. Phys. B, 2026, Vol. 35(4): 044206    DOI: 10.1088/1674-1056/ae0162
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

Temperature-compensated fiber Bragg grating pressure sensor utilizing square diaphragm-based stress transfer structure

Qinggeng Fan(樊庆赓)1, Dequan Feng(冯德全)2, Zhen'an Jia(贾振安)2, and Muguang Wang(王目光)1,†
1 Institute of Lightwave Technology, Key Laboratory of All Optical Network and Advanced Telecommunication Network, Ministry of Education, Beijing Jiaotong University, Beijing 100044, China;
2 Ministry of Education Key Laboratory on Photoelectric Oil-Gas Logging and Detecting, School of Science, Xi'an Shiyou University, Xi'an 710065, China
Abstract  A fiber Bragg grating (FBG) pressure sensor using square diaphragm, dowel bar, and constant-strength cantilever beam (CSCB) as the stress transfer structure is proposed in this paper. The measurement principle involving pressure to strain transduction is described. Comparative finite element simulations of two diaphragms show square diaphragm's superior pressure responsivity, demonstrating a central deflection approximately 30% greater than that of the circular diaphragm. The performance of this design over the range of 0 to 2 MPa is experimentally evaluated, achieving a pressure sensitivity of 273.72 pm/MPa, excellent coefficient of determination ($R^{2}$) of 0.9992, 0.688% full scale (FS) hysteresis, and 3.368% FS repeatability errors. Furthermore, the utilization of difference in central wavelength shifts between dual Bragg gratings enables effective temperature compensation, resulting in a relative error of 2%. The cost-effective sensor can be adopted for the pressure measurement of gases or liquids within pipelines.
Keywords:  pressure sensor      fiber Bragg grating (FBG)      square diaphragm      temperature compensation  
Received:  24 June 2025      Revised:  20 August 2025      Accepted manuscript online:  02 September 2025
PACS:  42.81.-i (Fiber optics)  
  07.07.Df (Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing)  
  47.80.Fg (Pressure and temperature measurements)  
  07.60.Vg (Fiber-optic instruments)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. U2006217 and 62371035).
Corresponding Authors:  Muguang Wang     E-mail:  mgwang@bjtu.edu.cn

Cite this article: 

Qinggeng Fan(樊庆赓), Dequan Feng(冯德全), Zhen'an Jia(贾振安), and Muguang Wang(王目光) Temperature-compensated fiber Bragg grating pressure sensor utilizing square diaphragm-based stress transfer structure 2026 Chin. Phys. B 35 044206

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