A Fiber Bragg Grating Force Sensor With Sensitization Structure

This article presents a fiber Bragg grating (FBG) force sensor with enhanced sensitivity. a strain-reinforcing mechanism comprised of a linear structure and loop-shaped structure is proposed. When external tension is applied, the strain directions are opposite in the two structures. Two FBGs were ad...

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Bibliographic Details
Published in:IEEE sensors journal 2021-02, Vol.21 (3), p.3042-3048
Main Authors: Hu, Dongtao, Lv, Shanke, Guo, Yongxing, He, Huagang, Liu, Jiayi
Format: Article
Language:English
Subjects:
acceleration sensor
Bragg gratings
Creep strength
FBG accelerometer
fiber Bragg grating
Fiber gratings
Fiber optic sensor
Finite element method
Force
Mathematical analysis
Performance tests
Sensitivity
Sensitivity enhancement
Sensors
Strain
Strain measurement
Structural health monitoring
Substrates
Temperature compensation
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Summary:This article presents a fiber Bragg grating (FBG) force sensor with enhanced sensitivity. a strain-reinforcing mechanism comprised of a linear structure and loop-shaped structure is proposed. When external tension is applied, the strain directions are opposite in the two structures. Two FBGs were adhered to the surfaces of positive and negative strain bodies and sensor data were compared. Then, the sensing principle of the FBG force sensor was deduced based on the theory of material mechanics. Results of theoretical calculations and finite element analysis (FEA) show that sensitivity of the proposed sensor is about 5.07 times higher than an FBG directly adhered to the surface of the substrate. Comprehensive testing of the sensor prototype was conducted. Experimental results show that the sensor can achieve a sensitivity of 38.25 pm/kN with a repeatability error and hysteresis error of 2.11% and 1.76%, respectively. The enhanced coefficient is 4.84, which is basically consistent with theoretical design value of 5.07. In addition, favorable temperature compensation and creep resistance were obtained during performance tests. Good capability for alternating strain measurement has also been demonstrated. Our results demonstrate the potential for superior structural health monitoring in civil engineering applications using the proposed sensor structure.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2020.3027569