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

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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Table 1. Physical parameters of the sensor

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Table 1. Physical parameters of the sensor

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 2. Initial wavelengths of each sensor
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Table 2. Initial wavelengths of each sensor
$λ_{1}$ $λ_{2}$ $λ_{3}$ $λ_{4}$
1537.8838 1537.9940 1537.8546 1537.9982

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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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