Weiming Ke, zhenhua Li, Zhixiang Zhou, Yanmei Lin, Yi Xiao. Reduced Graphene Oxide-Based Interferometric Fiber-Optic Humidity Sensor[J]. Acta Optica Sinica, 2019, 39(12): 1206007
- Acta Optica Sinica
- Vol. 39, Issue 12, 1206007 (2019)
Fig. 1. Schematic of sensor
Fig. 2. Characterization test results of GO and RGO coated on the fiber. (a) Raman spectra of GO and RGO; (b) XRD spectra of GO and RGO; (c)(d) XPS spectra of GO and RGO. Power spectra of C—C bond (284.7 eV), C—O bond (286.9 eV), and surface adsorbed oxygen (532.65 eV) are shown
Fig. 3. SEM photo of cross section of RGO-covered microfiber
Fig. 4. Experimental setup
Fig. 5. Interference spectrum of transmitted light in sensor at 25 ℃ when RH is 65%
Fig. 6. Variation of interference spectrum of transmitted light in sensor with humidity at humidity rise stage. (a) 45%RH; (b) 95%RH; (c) 45%RH
Fig. 7. Wavelength of interference dip as a function of humidity. (a) Interference dip1; (b) interference dip2
Fig. 8. Responses of interference dip1 and dip2 to variation of temperature at circumstance humidity of 61%
Fig. 9. Comparison of transmitted light spectra of sensor before and after heating under different conditions. (a) 25 ℃, 65%RH; (b) 25 ℃, 95%RH
Fig. 10. Evolution of interference dip2. (a) Evolution of interference dip2 with increase of humidity; (b) evolution of interference dip2 with decrease of humidity; (c) wavelength of interference dip2 as a function of humidity
Fig. 11. Response of output optical power of sensor to human expiration at transmitted light wavelength of 1568 nm
Fig. 12. Fluctuations of wavelength of interference dip2 at different constant humidity
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Table 1. Sensors with maximum sensitivities among non-graphene-type OFHSs and their dynamic ranges
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Table 2. Sensitivities and dynamic ranges of sensors among graphene-type OFHSs
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