Influence of Fiber Bragg Grating Coupling Mode on Sensing Characteristics of Unidirectional CFRP Plate

Bingjie Miao; Shigang Luo; Chunhong Wang; Shaobo Song; Jin He

doi:10.3788/LOP220689

Laser & Optoelectronics Progress, Volume. 60, Issue 5, 0528003(2023)

Influence of Fiber Bragg Grating Coupling Mode on Sensing Characteristics of Unidirectional CFRP Plate

Bingjie Miao¹, Shigang Luo^1、*, Chunhong Wang², Shaobo Song¹, and Jin He¹

Author Affiliations

¹Product Development Department, Carbon Technology Group Co., Ltd., Tianjin 300383, China

²College of Textile Science and Engineering, Tiangong University, Tianjin 300387, China

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Figures & Tables(10)

Fig. 1. Principle of sample preparation. (a) Type of external bare grating; (b) type of external substrate; (c) type of embedded bare grating

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Fig. 2. Variation curves of central wavelength variation with temperature. (a) T-1; (b) T-2; (c) T-3

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Fig. 3. Real-time monitoring curves of the sensor during the heating process

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Fig. 4. Experimental device of the cyclic loading

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Fig. 5. Variation curve of sensor center wavelength with stress. (a) L-1; (b) L-2; (c) L-3

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Fig. 6. Center wavelength change-time curves of K-1, K-2, and K-3

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Table 1. Sample numbers of the three groups of tests
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Table 1. Sample numbers of the three groups of tests
No. Experiment 1 Experiment 2 Experiment 3
Type of external bare grating T-1 L-1 K-1
Type of external substrate T-2 L-2 K-2
Type of embedded bare grating T-3 L-3 K-3

Table 2. Retardance and repeatability of T-1, T-2, and T-3

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Table 2. Retardance and repeatability of T-1, T-2, and T-3

Properties of FBG sensors	T-1	T-2	T-3
Maximum hystersis（ $Δ Y_{H, m a x}$ ）	0.0007	0.0017	0.0013
Full range output value（ $Y_{F S}$ ）	0.343	0.362	0.325
Maximum standard deviation（ $S_{m a x}$ ）	0.0047	0.0040	0.0031
Retardance /%	0.20	0.47	0.40
Repeatability /%	5.89	4.75	4.10

Table 4. Retardance and repeatability of L-1, L-2, and L-3

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Table 4. Retardance and repeatability of L-1, L-2, and L-3

Properties of FBG sensors	L-1	L-2	L-3
Maximum hystersis（ $Δ Y_{H, m a x}$ ）	0.237	0.199	0.019
Full range output value（ $Y_{F S}$ ）	3.835	7.716	7.525
Maximum standard deviation（ $S_{m a x}$ ）	0.123	0.239	0.056
Retardance /%	6.18	2.58	0.25
Repeatability /%	13.80	13.33	3.20

Table 5. Detailed parameters in the long-term detection process
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Table 5. Detailed parameters in the long-term detection process
Sensor Stage a Stage b
$∆ λ$ /nm Stress loss /MPa $∆ T$ /s $∆ λ$ /nm Stress loss /MPa
K-1 0.342 92.43 33418 0.338 91.35
K-2 0.389 49.87 34305 0.269 34.48
K-3 0.214 28.53 1303 0.018 2.40

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Bingjie Miao, Shigang Luo, Chunhong Wang, Shaobo Song, Jin He. Influence of Fiber Bragg Grating Coupling Mode on Sensing Characteristics of Unidirectional CFRP Plate[J]. Laser & Optoelectronics Progress, 2023, 60(5): 0528003

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