Optical fiber sensor temperature coded for concentration measurement of oilbiodiesel blends
This work describes the operation of an optical fiber sensor employed in the determination of remaining oil concentration in oilbiodiesel blends. The sensor is based both on the sensitivity of a long period grating to changes in the surroundings refractive index and on the thermo-optical properties of oilbiodiesel blends. The sensor response is provided by a temperature coded interrogation unit that employs an auxiliary fiber Bragg grating. The standard metrological analysis of an optimized sensor showed that is possible to detect until 0.10%v/v of oil in oilbiodiesel blends.
optical fiber sensor biofuel analysis interrogation technique