Shizheng SUN, Pengzheng YANG, Xiao LIU, Yuanjun LEI, Zhaowei LIU. KCl concentration measurement using FBG sensor based on layered PI film[J]. Optics and Precision Engineering, 2023, 31(3): 322
- Optics and Precision Engineering
- Vol. 31, Issue 3, 322 (2023)
Fig. 1. Schematic diagram of water concentration distribution of layered PI membrane
Fig. 2. Schematic diagram of FBG sensing
Fig. 3. Schematic diagram of measurement principle of PI film FBG concentration sensor
Fig. 4. Schematic diagram of manufacturing process of FBG concentration sensor
Fig. 5. Heating curing temperature curve of PI coating
Fig. 6. FBG sensor concentration experimental system
Fig. 7. Reflection spectra of layered PI film FBG at different concentrations
Fig. 8. Concentration characteristic curves of FBG in layered PI film
Fig. 9. Positive and negative stroke test results
Fig. 10. Concentration sensing characteristic curves of FBG in annular PI films with different layers
Fig. 11. Comparison diagram of wavelength drift
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Table 1. Main parameters of thermosetting polyimide
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Table 2. FBG1 concentration experimental data
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Table 3. Sensitivity characteristics of ring-shaped PI thin film FBG sensors with different layers
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Table 4. Experimental data of wavelength drift
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