Chao Du, Bin Zhang, Shuang Zhao, Qiuyu Wang, Li Zhang, Liqin Cui, Xiao Deng. Ultrasensitive Methane Volume Fraction Sensor Based on Long Period Fiber Grating and Back-Propagation Neural Network[J]. Laser & Optoelectronics Progress, 2023, 60(7): 0706009
- Laser & Optoelectronics Progress
- Vol. 60, Issue 7, 0706009 (2023)
Fig. 1. Designed dual-layer sensing structure of LPFG
Fig. 2. PMCs between LP06 and LP01 for different cladding diameters
Fig. 3. Single-layer film structure. (a) PMCs between LP06 and LP01 under different methane volume fraction; (b) simulated transmission spectra of LPFG when methane volume fraction changes from 0% to 3.5%
Fig. 4. Film thickness optimization. (a) Relationship between effective RI of LP06 and coated film thickness; (b) relationship between effective RI variation rate of LP06 and film thickness
Fig. 5. Dual-layer thin film structures. (a) PMCs between LP06 and LP01 under different methane volume fraction; (b) simulated transmission spectra of LPFG when methane volume fraction changes from 0% to 3.5%
Fig. 6. Methane volume fraction changes from 0% to 3.5%. (a) PMCs between LP06 and LP01; (b) resonance wavelength shifts with methane volume fraction variations
Fig. 7. Model of three-layer BP neural network
Fig. 8. Test sample prediction results. (a) Comparison of predicted and tested values; (b) prediction error of the test sample
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Table 1. Comparison of sensitivity for different methane sensor
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