Yitong LI, Yuqiang YANG, Xiaoguang MU, Ji WANG, Jiale GAO. Temperature insensitive optical fiber dual-cavity salinity sensor[J]. Optics and Precision Engineering, 2024, 32(9): 1283
- Optics and Precision Engineering
- Vol. 32, Issue 9, 1283 (2024)
Fig. 1. Structure of saltwater cavity
Fig. 2. Structure of double parallel cavity
Fig. 3. Interference spectra of single cavity and parallel double cavity with different salinities
Fig. 4. Schematic diagram of optical fiber salinity sensing experimental setup
Fig. 5. Microscope image of saltwater cavity and air cavity
Fig. 6. Variation of saltwater cavity interference spectrum and peak wavelength with temperature
Fig. 7. Variation of air cavity interference spectrum and peak wavelength with temperature
Fig. 8. Variation of sensor interference spectrum and peak wavelength with temperature
Fig. 9. Variation of saltwater cavity interference spectrum and peak wavelength with salinity
Fig. 10. Variation of sensor interference spectrum and peak wavelength with salinity
Fig. 11. Sensor repeatability and stability test results
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Table 1. Comparison of temperature sensitivity and salinity sensitivity of fiber optic salinity sensors
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