Chinese Journal of Lasers, Volume. 47, Issue 1, 0104004(2020)
Strain Transfer Coupling Mechanism of Surface-Bonded Fiber Bragg Grating Sensor
Figures & Tables(14)
Fig. 2. Separate coupling analysis model and coordinate system for strain transfer of surface-bonded FBG. (a) Simplified model for adhesive of surface-bonded FBG; (b) separate analysis model for strain transfer; (c) infinitesimal force acting and coordinate system in coating of FBG; (d) infinitesimal force acting and coordinate system in adhesive of FBG
Fig. 3. Comparison of distributions of axial strain transfer coefficients in fiber core
Fig. 6. Influence of FBG coating on modification accuracy of measured strain error. (a) Young's modulus of coating; (b) diameter of coating
Fig. 7. Influence of adhesive length on modification accuracy of measured strain error
Fig. 8. Influences of geometrical parameters of adhesive on modification accuracy of measured strain error. (a) Influence of adhesive width; (b) influence of adhesive bottom thickness; (c) influence of adhesive top thickness
Fig. 9. Experiments for theoretical solution accuracy of strain sensing coefficient of surface-bonded FBG. (a) Carbon steel anchor used as measured object; (b) nylon rod used as measured object
Fig. 10. Strain sensing coefficient of FBG (curve) and error of theoretical model (bar chart) in experiment I
Fig. 11. Strain sensing coefficient of FBG (curve) and error of theoretical model (bar chart) in experiment II
Table 1. Values of main parameters affecting modification coefficient of strain error
View tableTable 1. Values of main parameters affecting modification coefficient of strain error
Parameter symbol Standard value Value range Elastic modulus of coating Ec /MPa 2.55/50/300 2-300 Diameter ofcoating dc /μm 250 155-500 Adhesive length 2L /mm 50 10-150 Adhesive width w /mm 2 0.25-5 Adhesive top thickness ht/ mm 0 0-1 Adhesive bottom thickness hb/ mm 0 0-1
Table 2. Comparison of experimental and theoretical solutions for strain sensing coefficient of FBG in experiment I
View tableTable 2. Comparison of experimental and theoretical solutions for strain sensing coefficient of FBG in experiment I
No. 2L /mm w /mm ηFEM /% ηFBG /% Δη /% I-1 11.32 1.88 50.14 49.27 1.735 I-2a 11.68 2.96 101.20 99.99 1.196 I-3 13.68 3.12 62.69 60.91 2.839 I-4a 14.02 3.46 99.96 99.99 0.030 I-5 15.08 3.02 67.13 66.67 0.685 I-6a 14.94 2.88 100.05 99.99 0.060 I-7 22.02 2.64 86.17 85.31 0.998 I-8 24.98 2.12 89.40 89.46 0.067 I-9 28.32 3.24 93.31 93.13 0.193
Table 3. Comparison of experimental and theoretical results of strain sensing coefficient of FBG in experiment II
View tableTable 3. Comparison of experimental and theoretical results of strain sensing coefficient of FBG in experiment II
No. 2L /mm w /mm ηFEM /% ηFBG /% Δη /% II-1 10.82 2.52 44.01 44.97 2.181 II-2a 11.02 1.86 97.14 97.08 0.062 II-3 16.58 3.34 69.77 70.46 0.989 II-4a 15.92 2.54 98.68 98.72 0.041 II-5 21.34 3.00 81.08 82.75 2.060 II-6a 21.78 3.24 98.85 98.95 -0.101 II-7 26.06 2.86 92.13 89.97 2.345 II-8 30.22 3.02 90.79 93.8 3.315
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Zhiqiao Quan, Xinqiu Fang, Guangzhe Xue, Xiukun Hu, Chao Gu. Strain Transfer Coupling Mechanism of Surface-Bonded Fiber Bragg Grating Sensor[J]. Chinese Journal of Lasers, 2020, 47(1): 0104004
Paper Information
Category: measurement and metrology
Received: Jul. 4, 2019
Accepted: Sep. 26, 2019
Published Online: Jan. 9, 2020
The Author Email: Xinqiu Fang (xinqiufang@163.com)
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