Abstract: This article proposes an intensity-modulated liquid level sensor (LLS) based on cascaded long-period fiber grating (CLBG) and fiber Bragg grating (FBG) structure with temperature ...

Abstract: In this letter, we develop a novel fiber-optic sensor based on a hollow-core Bragg fiber (HCBF) for high-precision detection of liquid level. The intensity responses of anti-resonance ...