28 September 2015 Fast interrogation of fiber Bragg grating sensors using electro-optic dual optical frequency combs
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Proceedings Volume 9634, 24th International Conference on Optical Fibre Sensors; 963422 (2015) https://doi.org/10.1117/12.2195288
Event: International Conference on Optical Fibre Sensors (OFS24), 2015, Curitiba, Brazil
Abstract
In this document, a FBG interrogation system based on a multimode optical source and a direct read-out is proposed for measuring fast phenomena such as vibrations and ultrasounds. The system is based on an electro-optic dual optical frequency-comb. This architecture allows the configuration of the multimode optical source parameters such as the number of modes that are within the reflected spectrum (FWHM) of the FBG. Results are presented for the dual-comb operating under optimized control when mapping these optical modes onto detectable tones of multiples of 100 kHz around a centre radiofrequency tone (40 MHz). Dynamic strain is induced onto the fiber through an actuator, which generates changes in the reflected wavelength of the FBG and in turn the modes within the reflected spectrum. The electrical signals are analyzed using fast Fourier transform algorithms allowing identification of the vibrations.
© (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
O. E. Bonilla-Manrique, O. E. Bonilla-Manrique, J. A Garcia-Souto, J. A Garcia-Souto, P. Martin-Mateos, P. Martin-Mateos, B. Jerez-Gonzalez, B. Jerez-Gonzalez, P. Acedo, P. Acedo, } "Fast interrogation of fiber Bragg grating sensors using electro-optic dual optical frequency combs ", Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 963422 (28 September 2015); doi: 10.1117/12.2195288; https://doi.org/10.1117/12.2195288
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