Xiren Jin, Zeju Rui, Zihang Xiang, Chupeng Lu, Shuo Zhang, Xian Xu, Mingyang Lü, Yiwei Ma, Cuiting Sun, Xinghua Yang, Tao Geng, Weimin Sun, Libo Yuan. Ultrasensitive liquid level sensor based on slice-shaped composite long period fiber grating[J]. Chinese Optics Letters, 2022, 20(1): 011202
- Chinese Optics Letters
- Vol. 20, Issue 1, 011202 (2022)
Fig. 1. Experimental device diagram for fabricating the SSC-LPFG.
Fig. 2. Scheme diagram of the SSC-LPFG fiber structure.
Fig. 3. (a) Simulated energy transfer diagram. (b) Experimental and simulated transmission spectra of the SSC-LPFG structure.
Fig. 4. Liquid level measuring device.
Fig. 5. Liquid level measurement begins and ends with wavelength drift.
Fig. 6. SSC-LPFG liquid level sensing performance at different liquid levels.
Fig. 7. (a) Resonant dip of sensors with different polishing depths. (b) Dip wavelength shift versus liquid level (different depth of polishing).
Fig. 8. Liquid level sensing performance.
Fig. 9. Response of dip wavelength to temperature changing.
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Table 1. Parameter Comparison of Optical Fiber Liquid Level Sensors
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