Work

Simultaneous detection of liquid level and refractive index with a long-period fiber grating based sensor device

Year: 2013

Type: article

Abstract: In this study, a long-period fiber grating (LPFG)-based optical fiber sensor device is proposed for simultaneous detection of liquid level and refractive index (RI). When part of the grating was submerged in an unknown liquid, the resonant wavelength of each cladding mode of the LPFG sensor varied linearly with the submerged length and nonlinearly with the RI of the liquid. By retaining the first-order (sensitivity) and second-order (cross sensitivity) terms of a Taylor expansion of the nonlinear relation, the changes in submerged length (or liquid level) and RI can be simultaneously evaluated from the changes in resonant wavelength of two cladding modes. The sensitivity coefficients to liquid level, RI, their cross effect and environmental effects were studied both analytically and experimentally. The maximum prediction error by the proposed evaluation algorithm was found to be 1 mm for liquid level and 0.005 for RI.

Source: Measurement Science and Technology

DOI: 10.1088/0957-0233/24/9/095303

Authors: Ying Huang, Baokai Chen, Genda Chen, Hai Xiao, Samee U Khan

Institutions: North Dakota State University, Missouri University of Science and Technology

Language: English

Topic: Advanced Fiber Optic Sensors

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: bronze

Funders: National Science Foundation, Division of Civil, Mechanical and Manufacturing Innovation

Award: Nano Ferrous Particles Dispersed on Optical Fiber Sensors for Distributed Corrosion Assessment of Civil Infrastructures