Optimization and Test of Fiber Bragg Grating Strain Sensor with Loop Structure

Dingyi Dan; Keqin Ding; Anqing Shu

doi:10.3788/LOP202259.1728002

Journals >Laser & Optoelectronics Progress >Volume 59 >Issue 17 >Page 1728002 > Article

Laser & Optoelectronics Progress
Vol. 59, Issue 17, 1728002 (2022)

Optimization and Test of Fiber Bragg Grating Strain Sensor with Loop Structure

Dingyi Dan¹, Keqin Ding^2、*, and Anqing Shu¹

Author Affiliations

¹School of Mechanical and Electrical Engineering, Wuhan Institute of Technology, Wuhan 430205, Hubei , China

²China Special Equipment Inspection and Research Institute, Beijing 100029, China

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DOI: 10.3788/LOP202259.1728002 Cite this Article Set citation alerts

Dingyi Dan, Keqin Ding, Anqing Shu. Optimization and Test of Fiber Bragg Grating Strain Sensor with Loop Structure[J]. Laser & Optoelectronics Progress, 2022, 59(17): 1728002 Copy Citation Text

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Fig. 1. Structure diagram of the FBG strain sensor

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Fig. 2. Schematic diagram of dimension parameters of the FBG strain sensor

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Fig. 3. Mesh division and load distribution of the senser

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Fig. 4. Deformation distribution of the sensor with loop structure. (a) Deformation distribution of the FBG; (b) deformation distribution of the matrix

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Fig. 5. Influence of different parameters on the strain sensitivity of the sensor. (a)

L

; (b)

D

; (c)

d

; (d)

h

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Fig. 6. Fabrication of the FBG sensor. (a) Matrix of the sensor; (b) workbench for processing optical fibers; (c) dispensing system; (d) fabricated fiber Bragg grating sensor

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Fig. 7. Schematic diagram of the installation of the sensor

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Fig. 8. Test system with applied temperature load and applied tensile load

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Fig. 9. Results of temperature-controlled experiments and tensile experiments. (a) Sensor wavelength as a function of temperature; (b) sensor wavelength drift as a function of tensile load

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Fig. 10. Load-strain curve of the sensor

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Physical parameter	Value
Elastic modulus of FBG $E_{f} / P a$	$7.2 \times 10^{10}$
Poisson’s ratio of FBG $λ_{f}$	$0.17$
Radius of FBG $r_{f} / m m$	$0.0625$
Height of bonding layer $h_{1} / m m$	$0.5$
Width of bonding layer $D_{1} / m m$	$1$
Length of bare FBG $L_{f} / m m$	$17$
Elastic modulus of bonding layer $E_{a} / P a$	$4 \times 10^{9}$
Poisson’s ratio of bonding layer $λ_{a}$	$0.34$
Elastic modulus of matrix $E_{m} / P a$	$1.94 \times 10^{11}$
Poisson’s ratio of matrix $λ_{m}$	$0.3$

Table 1. Physical parameters of the sensor

$λ_{1}$	$λ_{2}$	$λ_{3}$	$λ_{4}$
1537.8838	1537.9940	1537.8546	1537.9982

Table 2. Initial wavelengths of each sensor

Dingyi Dan, Keqin Ding, Anqing Shu. Optimization and Test of Fiber Bragg Grating Strain Sensor with Loop Structure[J]. Laser & Optoelectronics Progress, 2022, 59(17): 1728002

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