Ming Chen, Jianhua Chang, Yao Xu, Aobo Jin, Ziyi Hu. Optical Fiber Sensor for Simultaneous Measurement of Temperature, Humidity, and Strain Based on Hollow Core Fiber[J]. Acta Optica Sinica, 2023, 43(23): 2306001
- Acta Optica Sinica
- Vol. 43, Issue 23, 2306001 (2023)
Fig. 1. Schematic of sensor structure. (a) Schematic of S-H-S structure; (b) HCF endface diagram
Fig. 2. Schematic of optical transmission in FP resonant cavity
Fig. 3. Transmission and reflection spectra of the sensor. (a) In the air; (b) in the water
Fig. 4. Microscope diagrams of sensors with different lengths of HCF. (a) 50 μm; (b) 380 μm; (c) 520 μm; (d) 580 μm; (e) 780 μm; (f) 990 μm
Fig. 5. Reflection and transmission spectra for sensors with different lengths of HCF. (a) 50 μm; (b) 380 μm; (c) 520 μm; (d) 580 μm; (e) 780 μm; (f) 990 μm
Fig. 6. Reflection and transmission spectra for sensors with different cladding diameters when HCF length is 520 μm. (a) 125 μm; (b) 100 μm; (c) 90 μm; (d) 80 μm; (e) 65 μm; (f) 50 μm
Fig. 7. Micrograph of sensor and diagram of experimental setup. (a) Micrograph of sensor; (b) diagram of experimental setup
Fig. 8. Schematic of the position of descending. (a) dip 1; (b) dip 2 and dip 3
Fig. 9. Wavelength shift of dip 3 and their linear fitting results changed with relative humidity. (a) Wavelength shift before soak-raise; (b) wavelength shift after soak-raise; (c) linear fitting before soak-raise; (d) linear fitting after soak-raise
Fig. 10. Wavelength shift of descending and their linear fitting results changed with the temperature. (a) dip 1; (b) dip 2; (c) dip 3; (d) linear fitting results
Fig. 11. Wavelength shift of descending and their linear fitting results changed with relative humidity. (a) dip 1; (b) dip 2; (c) dip 3; (d) linear fitting results
Fig. 12. Wavelength shift of descending and their linear fitting results changed with the strain. (a) dip 1; (b) dip 2; (c) dip 3; (d) linear fitting results
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Table 1. Comparison of multi-parameter sensors of the same type
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