Técnica de Interrogação de LPGs Auto- Referenciável por Análise Espectral

This paper presents the development of a new interrogation technique for optical fiber sensors based on long period grating (LPG). The technique is a simple and robust mathematical model, that considers all the LPG’s spectral parameters, such as the bandwidth, the resonance wavelength, and the attenuation depth. The validation of this technique is done by experimental results obtained from measurements of the refractive index, with relative error less than 0.15%. A dynamic operating range to obtain the resonance wavelength shift of the LPG around 18 nm was verified.