Interrogação de sensores a fibra óptica através de métodos computacionais

Abstract

Optical fiber sensors have become a popular alternative to traditional electronic sensors due to their numerous advantages. An important challenge in deploying optical sensors is the interrogation of the sensor, that is, recovering the measurement value from the sensor output. This work aims to present a simple yet effective way of interrogating a fiber Bragg grating (FBG) sensor using optical filters and suitable computational methods. As an example, a temperature sensor was analyzed, although the interrogation system is able to deal with any measurement, by calibrating it suitably. This interrogation system is capable of giving the precise temperature value without directly measuring the resonance wavelength shift or performing any Fourier calculations. The methods were implemented and the training was accomplished using simulated data. Simulation results are presented and compared to a traditional method of interrogation. The system proposed in this work showed excellent performance in identifying the temperature from the sensor output and showed higher precision than the traditional method presented.