Open AccessHigh-Pass Filtering for Accurate Reconstruction of the Brillouin Frequency Shift Profile From Brillouin Optical Frequency Domain Analysis Data
Author(s) -
Luigi Zeni,
Ester Catalano,
Agnese Coscetta,
Aldo Minardo
Publication year - 2017
Publication title -
ieee sensors journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.681
H-Index - 121
eISSN - 1558-1748
pISSN - 1530-437X
DOI - 10.1109/jsen.2017.2768103
Subject(s) - signal processing and analysis , communication, networking and broadcast technologies , components, circuits, devices and systems , robotics and control systems
In this paper, we propose and demonstrate a new method to reconstruct the Brillouin frequency shift 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.