DESIGN AND EXPERIMENTAL VALIDATION OF A FIBER OPTIC PRESSURE SENSOR WITH FBG TECHNOLOGY

The development of smart systems through the use of components capable of autonomously generating data regarding their own performance is an extremely innovative aspect in the development of complex machines and their related control algorithms. This goal can be achieved by widely employing integrated and minimally invasive sensing technology that can be seamlessly integrated into control logic. In this regard, the use of monomodal optical fiber and Fiber Bragg Grating (FBG) sensors is the best technical solution currently available. This paper describes the development of a pressure sensor created by using an FBG sensor embedded in a silicone resin base. When subjected to pressure, the deformability of the resin induces a strain in the FBG sensor. The aim is therefore to verify the presence of a correlation between the applied pressure and the optical data generated by the grating. The sensor was fabricated by casting resin into a mold created through additive manufacturing, and then placed in an additional casing, also fabricated through additive manufacturing. The product underwent a specific experimental testing campaign, with the data analyzed statistically. The results highlighted excellent sensitivity, validating the proof of concept and providing an estimation of the sensor's current performance.