Optical sensor based on hybrid FBG/titanium dioxide coated LPFG for monitoring organic solvents in edible oils

TALANTA

卷:148

Article

Coelho, Luis^1,2  Viegas, Diana³  Santos, Jose Luis^1,2  Marques Martins de Almeida, Jose Manuel^1,4 

[1] Univ Porto, Fac Sci, INESC Technol & Sci, CAP INESC TEC,FCUP, P-4169007 Oporto, Portugal

[2] Univ Porto, Fac Sci, Dept Phys, P-4169007 Oporto, Portugal

[3] INL Int Iberian Nanotechnol Lab, P-4175330 Braga, Portugal

[4] Univ Tras Os Montes & Alto Douro, Sch Sci & Technol, Dept Phys, P-5001801 Vila Real, Portugal

关键词: Monitoring contamination of olive oil;    Organic solvents in edible oils;    Titanium dioxide coating;    Long period fiber grating;    Fiber Bragg grating;   

DOI  :  10.1016/j.talanta.2015.10.067

来源: Elsevier

【 摘 要 】

A hybrid optical sensing scheme based on a fiber Bragg grating (FBG) combined with a titanium dioxide coated long period fiber grating (LPFG) for monitoring organic solvents in high refractive index edible oils is reported. In order to investigate and optimize the sensor performance, two different FBG/LPFG interrogation systems were investigated. The readout of the sensor was implemented using either the wavelength shift of the LPFG resonance dip or the variation in the optical power level of the reflected/transmitted light at the FBG wavelength peak, which in turn depends on the wavelength position of the LPFG resonance. Hexane concentrations up to 20%V/V, corresponding to the refractive index range from 1.451 to 1.467, were considered. For the transmission mode of operation, sensitivities of 1.41 nm/%V/V and 0.11 dB/%V/V, with resolutions of 0.58%V/V and 0.29%V/V, were achieved when using the LPFG wavelength shift and the FBG transmitted optical power, respectively. For the FBG reflection mode of operation, a sensitivity of 0.07 dB/V/V and a resolution better than 0.16%V/V were estimated. (C) 2015 Elsevier B.V. All rights reserved.

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