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Structural schematic of eventual positions of air bubbles in the proposed directional fiber-optic level meter when the conditions are (a)clockwise inclination (−θ tilted), (b) equilibrated (θ = 0), and (c) counterclockwise inclination (+θ tilted), respectively.
Spectral responses of the measurements with different inclinations for the proposed level meters in the (a) equilibrant, (b) −θ inclination, and (c) +θ inclination conditions. Insets respectively indicate micrographs of the locations of the air-bubble in the HCFs (spectral resolution: 0.8 nm).
Schematic diagram of the proposed sensor with hybrid F-P cavities.
Measured FSR2 of the interference spectra with different situations (dliquid). Insets show the corresponding micrographs of the air bubble locations obtained by the sensor when in the equilibrant state, respectively, tilts to SMF side (−θ) and HCF end (+θ) directions. Here the tilted angle θ is about 5°.
Sensitivity of wavelength shift of the interference spectral dips with different temperature. Inset shows the wavelength shifts of the interference dips with different temperature.
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