Fiber Bragg Grating Humidity Sensor Based on Polyimide Material

Xinkui Xing; Xue Jiang; Fanfan Liu; Kabin Kuang; Heying Qin

doi:10.3788/LOP202259.1328002

Laser & Optoelectronics Progress, Volume. 59, Issue 13, 1328002(2022)

Fiber Bragg Grating Humidity Sensor Based on Polyimide Material

Xinkui Xing1...2,3, Xue Jiang1,2,3, Fanfan Liu1,2,3, Kabin Kuang1,2,3, and Heying Qin1,23,* |Show fewer author(s)

Author Affiliations

¹School of Civil and Architectural Engineering, Guilin University of Technology, Guilin 541004, Guangxi , China

²Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources, Guilin University of Technology, Guilin 541004, Guangxi , China

³Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering, Guilin 541004, Guangxi , China

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Figures & Tables(9)

Fig. 1. Schematic diagram of the FBG humidity sensor

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Fig. 2. Experimental product of PI coating film

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Fig. 3. Experimental system of the FBG humidity sensor

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Fig. 4. Humidity sensing characteristic curves of FBG coated with PI films of different thickness. (a) 0.13 mm; (b) 0.23 mm; (c) 0.35 mm

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Fig. 5. Sample and the bubbles it presents

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Fig. 6. Simulation results under constant humidity. (a) Temperature sensing characteristic curve; (b) temperature sensitivity curve

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Fig. 7. Humidity sensing characteristic curve under constant temperature (thickness: 0.13 mm)

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Table 1. Parameters of experimental samples
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Table 1. Parameters of experimental samples
Type Outer diameter /mm Inner diameter /mm Thickness /mm
Sample 0.18 0.15 0.07
0.24 0.20 0.13
0.34 0.30 0.23
0.46 0.40 0.35
0.56 0.50 0.45

Table 2. Humidity sensing characteristics and fitting degree of FBG films coated with PI films of different thickness and length
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Table 2. Humidity sensing characteristics and fitting degree of FBG films coated with PI films of different thickness and length
Thickness /mm Length /mm Sensitivity /（pm%RH） Fitting
0.13 10 5.5 0.99
20 5.4 0.99
30 5.4 0.99
0.23 10 5.6 0.95
20 5.7 0.95
30 5.7 0.95
0.35 10 1.7 0.99
20 7.2 0.92
30 6.5 0.92
40 5.0 0.94
50 4.4 0.94

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Xinkui Xing, Xue Jiang, Fanfan Liu, Kabin Kuang, Heying Qin. Fiber Bragg Grating Humidity Sensor Based on Polyimide Material[J]. Laser & Optoelectronics Progress, 2022, 59(13): 1328002

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