Abstract
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.
Highlights
IntroductionPhotonic Sensors be achieved [4]. the bare fiber Bragg grating (FBG) is thin and brittle, and its usual pressure sensitivity is only 0.003 nm/MPa [5], which cannot meet the requirements of engineering application and must adopt the appropriate packaging technology and methods in the actual measurement
Pressure sensors are the essential equipments in the field of pressure measurement
While the fiber Bragg grating (FBG) sensing technology being as a new measurement technology [2], which is mainly used as a sensitive component for the manufacture of optical fiber sensors and has the virtues of intrinsic safety, small size, light weight, anti-causticity, anti-electromagnetic, high sensitivity, strong reliability, and ease to form a quasi-distributed sensing system [3]
Summary
Photonic Sensors be achieved [4]. the bare FBG is thin and brittle, and its usual pressure sensitivity is only 0.003 nm/MPa [5], which cannot meet the requirements of engineering application and must adopt the appropriate packaging technology and methods in the actual measurement. Peng et al [6] proposed an FBG pressure sensor based on the free elastic cylinder and obtained the pressure sensitivity of 27 pm/MPa. Zhang et al [7] reported a pressure sensor by using the polymer coated FBG in the thick-wall metal elastic cylinder. Zhang et al [7] reported a pressure sensor by using the polymer coated FBG in the thick-wall metal elastic cylinder Their results showed the pressure sensitivity of this sensor is 1722 times higher than that of the bare grating. A temperature compensation FBG pressure sensor based on the elastic diaphragm is reported. The performance experiments indicated that the FBG pressure sensor has good linearity, low frequency chirp, and high stability, and the temperature cross-sensitivity is effectively avoided, which can provide guidance for the design and manufacture of the sensors, and can be used to measure pressure in mining engineering, civil engineering, or other complex environment
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