In-situ Calibration Method of FBG Strain Sensor under Dynamic Excitation

Table 1. Waveform matching coefficient of FBG strain sensor at 1 529 nm and 1 547 nm
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Table 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
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Table 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
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Table 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

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Table 4. Sensitivity calibration coefficient of FBG strain sensor under 250 g weight excitation

Wavelength/

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

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Table 5. Sensitivity calibration coefficient of FBG strain sensor under 500 g weight excitation

Wavelength/

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

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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)

DOI:10.3788/gzxb20235201.0106005

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Waveform matching coefficient of FBG strain sensor at 1 529 nm and 1 547 nm

Table 1. Waveform matching coefficient of FBG strain sensor at 1 529 nm and 1 547 nm

Table 2. Peak value of FBG strain sensor and resistance strain gauge at 1 529 nm

Table 2. Peak value of FBG strain sensor and resistance strain gauge at 1 529 nm

Table 3. Peak value of FBG strain sensor and resistance strain gauge at 1 547 nm

Table 3. Peak value of FBG strain sensor and resistance strain gauge at 1 547 nm

Table 4. Sensitivity calibration coefficient of FBG strain sensor under 250 g weight excitation

Table 4. Sensitivity calibration coefficient of FBG strain sensor under 250 g weight excitation

Table 5. Sensitivity calibration coefficient of FBG strain sensor under 500 g weight excitation

Table 5. Sensitivity calibration coefficient of FBG strain sensor under 500 g weight excitation

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