Acta Photonica Sinica, Volume. 52, Issue 1, 0106005(2023)
In-situ Calibration Method of FBG Strain Sensor under Dynamic Excitation
Figures & Tables(10)
Fig. 1. Diagram of FBG strain sensor dynamic calibration experimental device
Fig. 3. Waveform matching results of 1529 nm FBG strain sensor and resistance strain gauge
Fig. 5. Static data fitting of FBG strain sensors with wavelength of 1 529 nm and 1 547 nm
Table 1. Waveform matching coefficient of FBG strain sensor at 1 529 nm and 1 547 nm
View tableView in ArticleTable 1. Waveform matching coefficient of FBG strain sensor at 1 529 nm and 1 547 nm
Weight/g First test Second test Third test 1 529 nm 1 547 nm 1 529 nm 1 547 nm 1 529 nm 1 547 nm 250 0.994 9 0.994 8 0.989 5 0.989 4 0.991 3 0.991 1 500 0.996 4 0.996 4 0.983 8 0.983 5 0.996 4 0.996 3
Table 2. Peak value of FBG strain sensor and resistance strain gauge at 1 529 nm
View tableView in ArticleTable 2. Peak value of FBG strain sensor and resistance strain gauge at 1 529 nm
Parameter 1 2 3 4 5 6 7 FBG Δλ /pm 62.3 61.6 61.1 62.0 61.6 62.2 61.8 Strain gauge Δε /με 50.6 50.6 50.3 50.3 50.4 50.4 50.4 Sensitivity coefficient/
（pm·με-1）
1.23 1.22 1.22 1.23 1.22 1.23 1.23
Table 3. Peak value of FBG strain sensor and resistance strain gauge at 1 547 nm
View tableView in ArticleTable 3. Peak value of FBG strain sensor and resistance strain gauge at 1 547 nm
Parameter 1 2 3 4 5 6 7 FBG Δλ/pm 59.7 60.8 59.6 59.9 59.9 59.6 60.8 Strain gauge Δε/με 50.6 50.6 50.3 50.3 50.4 50.4 50.4 Sensitivity coefficient/
（pm·με-1）
1.18 1.20 1.18 1.19 1.19 1.18 1.21
Table 4. Sensitivity calibration coefficient of FBG strain sensor under 250 g weight excitation
View tableView in ArticleTable 4. Sensitivity calibration coefficient of FBG strain sensor under 250 g weight excitation
Wavelength/
nm
First test Second test Third test Average value Sensitivity coefficient/
（pm·με-1）
Relative standard deviation Sensitivity coefficient/
（pm·με-1）
Relative standard deviation Sensitivity coefficient/
（pm·με-1）
Relative standard deviation Sensitivity coefficient/
（pm·με-1）
1 529 1.23 0.57% 1.23 0.58% 1.23 0.66% 1.230 1 547 1.19 0.88% 1.19 0.46% 1.20 0.26% 1.193
Table 5. Sensitivity calibration coefficient of FBG strain sensor under 500 g weight excitation
View tableView in ArticleTable 5. Sensitivity calibration coefficient of FBG strain sensor under 500 g weight excitation
Wavelength/
nm
First test Second test Third test Average value Sensitivity coefficient/
（pm·με-1）
Relative standard deviation Sensitivity coefficient/
（pm·με-1）
Relative standard deviation Sensitivity coefficient/
（pm·με-1）
Relative standard deviation Sensitivity coefficient/
（pm·με-1）
1 529 1.23 0.40% 1.23 0.66% 1.23 0.49% 1.230 1 547 1.20 0.31% 1.19 0.32% 1.19 0.26% 1.193
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Ye LU, Huaping GONG, Jingyi CAI, Qiming FAN, Chunliu ZHAO. In-situ Calibration Method of FBG Strain Sensor under Dynamic Excitation[J]. Acta Photonica Sinica, 2023, 52(1): 0106005
Paper Information
Category: Fiber Optics and Optical Communications
Received: Jun. 16, 2022
Accepted: Jul. 6, 2022
Published Online: Feb. 27, 2023
The Author Email: GONG Huaping (gonghp@163.com)
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