Abstract - Three approaches that allow the tailoring of long period gratings based refractometric sensors for concentration measurement in fuel blends are employed to assess the fuel quality in biodiesel and biodiesel-petrodiesel blend. To allow the analysis of fuel samples with refractive index higher than fiber cladding one, the samples refractive indices were changed by thermo-optic effect and by dilution in a standard substance with low refractive index. The obtained results show the sensor can detect oil concentration in biodiesel samples with resolution as better as 0.07% and biodiesel concentration in biodiesel-petrodiesel samples with average resolution of 0.09%.
Marianne Sumie Kawano, Bárbara Rutyna Heidemann, Tárik Kaiel Machado Cardoso, Gustavo Rafael Collere Possetti, Ricardo Canute Kamikawachi, Marcia Muller, and José Luís Fabris, "Tailoring fiber grating sensors for assessment of highly refractive fuels," Appl. Opt. 51, 2015-2022 (2012)
Source: Optical Society of America