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A fiber micro-bending sensor is presented with multimode interference effects created by splicing a piece of no-core fiber between two single-mode fibers. The micro-bending measurement is experimentally demonstrated with a sensitivity of −183.788 nm/m−1.
A fiber PH sensor based on an air-gap long period fiber grating (AG-LPG) in a multi-modes fiber is proposed with the sensitivity of −0.219 nm/pH and 0.248 nm/ pH for measuring the acid and alkaline solutions respectively. The operating mechanism is based on the index of different pH-value solutions to cause the grating loss-dip wavelength shift due to the change of the effective index both in core...
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.
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