Desenvolvimento de sistema sensorial ótico para o monitoramento contínuo da integridade de estruturas

Abstract

In recent years, there has been a strong trend towards the use of optical sensors based on Bragg g ratings to monitor various parameters, thanks to the advantages over other sensors. Among these advantages, there is an increase in the signal to noise ratio, speed and efficiency in data collection, possibility of use in aggressive environments, immunity to electromagnetic interference, electrical insulation, reduced weight and size, longer useful life, among others. Monitoring methods for parameters such as t emperature, deformation, stress, refractive index, acceleration and relative humidity are already widespread in the technique and literature. Given this, the current scenario of applications of these sensors in Brazil stands out, where there are works aime d at monitoring engineering works of art (such as bridges and viaducts) and similar structures, however, the application is still scarce in sectors of the infrastructure, such as port stations and flammable transport pipelines. Therefore, through this work , it is proposed to develop an optical sensory system based on Bragg gratings to monitor the thickness loss of a 1020 carbon steel metal plate subjected to controlled corrosion, by collecting frequency variation data of the plate as a function of time. To validate the results obtained experimentally, electrochemical tests were also performed under similar conditions, as well as a numerical model representative of the situation observed experimentally was adjusted. Through the tests carried out, it was possi ble to observe that the results found experimentally presented an adequate reliability, indicating the adequate functionality of the sensors for monitoring the loss of thickness caused by corrosion in metallic structures.