Min Shao, Haonan Sun, Rong Zhang, Yinggang Liu, Xueguang Qiao. Michelson Interferometric Humidity Sensor Based on Photonic Crystal Fiber[J]. Acta Optica Sinica, 2020, 40(24): 2406002
- Acta Optica Sinica
- Vol. 40, Issue 24, 2406002 (2020)
Fig. 1. Diagram of sensor structure and fiber photo. (a) Schematic of the designed sensor structure; (b) cross sectional view of PCF; (c) microscope image of waist-enlarged taper
Fig. 2. Reflection spectra of the designed sensor with different PCF lengths
Fig. 3. Spatial frequency spectra of the designed sensor with different PCF lengths
Fig. 4. Setup of humidity sensing experiment
Fig. 5. Humidity response of the sensor. (a) Reflection spectra of the designed sensor under different relative humidities; (b) intensity and wavelength varying with relative humidity; (c) relative humidity sensitivity of the designed sensor with different PCF lengths
Fig. 6. Sensor's temperature response. (a) Reflection spectra of the designed sensor under different temperatures; (b) intensity and wavelength varying with temperature
Fig. 7. Stability of the designed sensor, inset is reflection spectra at RH of 20%, temperature of 27 ℃
Fig. 8. Response time of the designed sensor
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Table 1. Comparison of humidity sensors based on PCF
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