Temperature Compensation Fiber Bragg Grating Pressure Sensor Based on Plane Diaphragm
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Pressure sensors are the essential equipments in the field of pressure measurement. In this work, we propose a temperature compensation fiber Bragg grating (FBG) pressure sensor based on the plane diaphragm. The plane diaphragm and pressure sensitivity FBG (PS FBG) are used as the pressure sensitive components, and the temperature compensation FBG (TC FBG) is used to improve the temperature cross-sensitivity. Mechanical deformation model and deformation characteristics simulation analysis of the diaphragm are presented. The measurement principle and theoretical analysis of the mathematical relationship between the FBG central wavelength shift and pressure of the sensor are introduced. The sensitivity and measure range can be adjusted by utilizing the different materials and sizes of the diaphragm to accommodate different measure environments. The performance experiments are carried out, and the results indicate that the pressure sensitivity of the sensor is 35.7 pm/MPa in a range from 0 MPa to 50 MPa and has good linearity with a linear fitting correlation coefficient of 99.95%. In addition, the sensor has the advantages of low frequency chirp and high stability, which can be used to measure pressure in mining engineering, civil engineering, or other complex environment.
KeywordsFiber Bragg grating plane diaphragm temperature compensation pressure sensor performance experiment low frequency chirp
This study was financially supported by the Fundamental Research Funds for the Central Universities (China University of Mining and Technology) (No. 2014ZDPY22), the Funded Project of Jiangsu Provincial Six Talent Peaks (No. 2014-ZBZZ-008), a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (No. SZBF2011-6-B35), and a Project Funded by State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology (No. SKLCRSM16X01).
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