Title :
Distributed Sensing at Centimeter-Scale Spatial Resolution by BOFDA: Measurements and Signal Processing
Author :
Bernini, Romeo ; Minardo, Aldo ; Zeni, Luigi
Author_Institution :
Ist. per il Rilevamento Elettromagnetico dell´´Ambiente, Consiglio Naz. delle Ric., Naples, Italy
Abstract :
In this paper, we demonstrate high spatial (≈3 cm) and spectral (≈30 MHz) resolution Brillouin sensing by use of Brillouin optical frequency-domain analysis (BOFDA) and signal processing. An iterative method is employed to correct the acquired data from spurious effects associated to acoustic wave modulation and relevant in the high spatial resolution regime. Experimental tests demonstrate that the proposed algorithm allows to reconstruct the Brillouin shift profile with the full spatial resolution allowed by the system bandwidth.
Keywords :
acoustic waves; distributed sensors; fibre optic sensors; frequency-domain analysis; iterative methods; optical information processing; stimulated Brillouin scattering; Brillouin optical frequency-domain analysis; Brillouin shift profile; acoustic wave modulation; centimeter-scale spatial resolution; distributed sensing; high spatial resolution Brillouin sensing; high spectral resolution Brillouin sensing; iterative method; signal processing; spurious effects; system bandwidth; Acoustic beams; Acoustics; Frequency modulation; Optical fiber sensors; Scattering; Spatial resolution; Optical fiber sensors; strain measurement; temperature measurement;
Journal_Title :
Photonics Journal, IEEE
DOI :
10.1109/JPHOT.2011.2179024
