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In this article, a pH fiber‐optic sensor based on an air‐gap long period fiber grating (AG‐LPG) in a multi‐modes fiber is proposed. Owing to the different pH solutions to cause the index variation of surrounding AG‐LPG, the grating wavelength will be shifted due to the change of the effective index both in core and cladding layers. For pH sensing applications, the experimental results show the sensitivity...
In this paper, we propose a novel high-sensitivity fiber-optic humidity sensor based on a calcium chloride thin film to be coated on an air-gap long-period grating fabricated (AG-LPG) by combining the fiber side-polishing and fiber etching methods. When the surrounding refractive index of the air-gap long-period grating is changed by a change in humidity, the grating resonant wavelength is considered...
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