Abstract-In this work, a refractometric fiber sensor for the liquid fuels sector is described. The use of etched FBGs produced in multimode fibers is proposed to overcome the drawbacks associated with sensing high refractive index samples employing fiber transducers. The transducer sensitivity can be tailored by adjusting the final diameter of the etched Bragg grating. Due to a trade-off between the signal-to-noise ratio and the sensitivity, operational parameters of the sensor must be designed to match the expected refractive index dynamic range for specific applications. and in the following years it is expected to reach an upper limit of 27.5 %. As a new technology, its production as well as quality and conformity monitoring still presents few methods and instruments to assess standards, for both production and commercialization sectors [4 -6].The biodiesel is produced by a chemical reaction known as transesterification, with the conversion of a fatty acid into an ester and generating glycerin as a by-product. Some authors [7,8] showed that it is possible to monitor the ester conversion by the determination of the sample refractive index. Such possibility instigated studies about the performance of optical fiber devices as long period gratings
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