双膜结构FBG土压力传感器优化设计及灵敏度分析

doi:10.3969/j.issn.0255-8297.2024.02.006

Abstract

Abstract: In order to realize the health monitoring and effective evaluation of the pile foundation structure safety and its service state, a double-diaphragm structure soil pressure sensor is proposed in this paper. Fiber Bragg gratings (FBGs) are used as the sensing element. By adding a temperature compensation film in the protective structure, complete separation of temperature effects and external load impacts is achieved. Based on the working principle of a double-diaphragm structure soil pressure sensor, the pressure sensitivity coefficient characteristics of the sensor are discussed. A systematic analysis is conducted on the influencing parameters of sensitivity coefficient by combining finite element analysis and experimental research. Numerical analysis results show that the thickness of the membrane has the greatest impact on the pressure sensitivity coefficient. The structural radius and membrane thickness can be set as 20 mm and 1.8 mm, respectively. Experimental results show that within the range of 0~2 MPa, the pressure sensitivity coefficient reaches 3.32 pm/kPa.

Key words: fiber Bragg grating (FBG), double-diaphragm structure, soil pressure sensor, sensitivity analysis

CLC Number:

TN253

XING Guangzhi, CHEN Bozhi, WU Wenjing. Optimal Design and Sensitivity Analysis of Double-Diaphragm Structure FBG Soil Pressure Sensors[J]. Journal of Applied Sciences, 2024, 42(2): 248-261.

References

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Optimal Design and Sensitivity Analysis of Double-Diaphragm Structure FBG Soil Pressure Sensors

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