In this work, we propose and demonstrate a new method to reconstruct the Brillouin Frequency shift (BFS) profile in high spatial resolution Brillouin Optical Frequency Domain Analysis (BOFDA) sensors. The method aims to compensate the distorting terms affecting BOFDA measurements, which originate from the modulation impressed on the acoustic wave involved in the scattering phenomenon. We show that these terms can be easily removed by applying a high-pass filter to the data acquired in the frequency-domain, at the cost of a degradation of the signal-to-noise ratio. A numerical analysis, as well as experimental tests carried out at 8-mm spatial resolution, validate the proposed technique.
High-pass filtering for accurate reconstruction of the Brillouin Frequency Shift profile from Brillouin Optical Frequency Domain Analysis data
Zeni, L.;Coscetta, A.;Minardo, A.
2017
Abstract
In this work, we propose and demonstrate a new method to reconstruct the Brillouin Frequency shift (BFS) profile in high spatial resolution Brillouin Optical Frequency Domain Analysis (BOFDA) sensors. The method aims to compensate the distorting terms affecting BOFDA measurements, which originate from the modulation impressed on the acoustic wave involved in the scattering phenomenon. We show that these terms can be easily removed by applying a high-pass filter to the data acquired in the frequency-domain, at the cost of a degradation of the signal-to-noise ratio. A numerical analysis, as well as experimental tests carried out at 8-mm spatial resolution, validate the proposed technique.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
