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A high sensitivity liquid refraction index fiberoptic sensor based on a multimode air-gap long period fiber grating is experimentally demonstrated with the sensitivity of 1063.737 nm and 702.032 nm per unit index for the sugar-solution and the salt-solution respectively.
A very high-sensitivity fiber hydrometer based on a side-polished long period grating fabricated in photonic crystal fibers is firstly experimentally demonstrated with the sensitivity of specific gravity of 3.02 nm /0.01.
In this paper, we show that both pressure and temperature can be measured simultaneously by using a high-sensitivity fiber sensor. This sensor has a superstructure fiber grating (SFG) encapsulated in a polymer-half-filled metal cylinder, which has two openings on opposite sides of the wall of the polymer, to sense the pressure. The sensed pressure is transferred into axial extended-strain. The variation...
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