Yanyan Xu, Jun Li, Hao Li, Yujia Zhao, Mingjing Xu, Jiaxin Liu, Peizhen Jiang, Ai Zhou. Research on Humidity Sensor Based on Tapered Seven Core Fiber[J]. Chinese Journal of Lasers, 2021, 48(23): 2306002
- Chinese Journal of Lasers
- Vol. 48, Issue 23, 2306002 (2021)
Fig. 1. Schematic diagrams of sensing structure. (a) Sensor structure; (b) microscope of the tapered area of TSCF; (c) cross section of seven core fiber untapered
Fig. 2. Variation of mode effective refractive index with external refractive index. (a) HE11; (b) HE12; (c) HE13
Fig. 3. Energy distribution in seven core fiber with diameter of 10 μm
Fig. 4. Relationship between the output normalized optical power of tapered fiber and wavelength at different refractive indexes
Fig. 5. Scanning electron microscopes. (a) Graphene oxide; (b) uncoated optical fiber; (c) optical fiber coated with graphene oxide; (d) partially enlarged optical fiber coated with graphene oxide
Fig. 6. Transmission spectra of sensor structure before and after tapering and GO coating
Fig. 7. Refractive index sensitivity of samples with different diameters. (a)(b) Sample s-1; (c)(d) sample s-2; (e)(f) sample s-3
Fig. 8. Relative humidity test device
Fig. 9. Transmission spectra of sample s-4 at different relative humidity
Fig. 10. Spectral response of different resonant waves of sample s-4 varying with humidity. (a)(b) Dip A; (c)(d) Dip B; (e)(f) Dip C
Fig. 11. Humidity response of sample s-5. (a) Transmission; (b) sensitivity of relative humidity
Fig. 12. Stability test of sample s-4 under different relative humidity
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