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
- Laser & Optoelectronics Progress
- Vol. 59, Issue 13, 1328002 (2022)
Fig. 1. Schematic diagram of the FBG humidity sensor
Fig. 2. Experimental product of PI coating film
Fig. 3. Experimental system of the FBG humidity sensor
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
Fig. 5. Sample and the bubbles it presents
Fig. 6. Simulation results under constant humidity. (a) Temperature sensing characteristic curve; (b) temperature sensitivity curve
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 2. Humidity sensing characteristics and fitting degree of FBG films coated with PI films of different thickness and length
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