Monitoring of high refractive index edible oils using coated long period fiber grating sensors Luís Carlos Coelho en Diana Viegas en José Luís Santos en José Almeida en 2018-01-13T20:14:54Z 2018-01-13T20:14:54Z 2015 en
dc.description.abstract Monitoring the quality of high refractive index edible oils is of great importance for the human health. Uncooked edible oils in general are healthy foodstuff, olive oil in particular, however, they are frequently used for baking and cooking. High quality edible oils are made from seeds, nuts or fruits by mechanical processes. Nevertheless, once the mechanical extraction is complete, up to 15% of the oil remains in oil pomace and in the mill wastewater, which can be extracted using organic solvents, often hexane. Optical fiber sensors based on long period fiber gratings (LPFG) have very low wavelength sensitivity when the surround refractive index is higher than the refractive index of the cladding. Titanium dioxide (TiO2) coated LPFG could lead to the realization of high sensitivity chemical sensor for the food industry. In this work LPFG coated with a TiO2 thin film were successfully used for to detect small levels of hexane diluted in edible oils and for real time monitoring the thermal deterioration of edible oils. For a TiO2 coating of 30 nm a wavelength sensitivity of 1361.7 nm/RIU (or 0.97 nm /% V/V) in the 1.4610-1.4670 refractive index range was achieved, corresponding to 0 to 12 % V/V of hexane in olive oil. A sensitivity higher than 638 nm/RIU at 225 degrees C was calculated, in the 1.4670-1.4735 refractive index range with a detection limit of thermal deterioration of about 1 minute. en
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dc.language eng en
dc.relation 5256 en
dc.relation 4636 en
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dc.rights info:eu-repo/semantics/embargoedAccess en
dc.title Monitoring of high refractive index edible oils using coated long period fiber grating sensors en
dc.type conferenceObject en
dc.type Publication en
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