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Measurement Accuracy Enhancement via Radio Frequency Filtering in Distributed Brillouin Sensing

ORCID
0000-0002-2562-7112
Affiliation
THz Photonics Group, Institut für Hochfrequenztechnik, Technische Universität BraunschweigSchleinitzstr. 22, 38106 Braunschweig, Germany. cheng.feng@ihf.tu-bs.de.
Feng, Cheng;
ORCID
0000-0003-3300-2312
Affiliation
THz Photonics Group, Institut für Hochfrequenztechnik, Technische Universität BraunschweigSchleinitzstr. 22, 38106 Braunschweig, Germany.
Preussler, Stefan;
ORCID
0000-0002-4204-463X
Affiliation
THz Photonics Group, Institut für Hochfrequenztechnik, Technische Universität BraunschweigSchleinitzstr. 22, 38106 Braunschweig, Germany.
Emad Kadum, Jaffar;
ORCID
0000-0001-6853-7128
Affiliation
THz Photonics Group, Institut für Hochfrequenztechnik, Technische Universität BraunschweigSchleinitzstr. 22, 38106 Braunschweig, Germany.
Schneider, Thomas

In this article, we demonstrate the noise reduction and signal to noise ratio (SNR) enhancement in Brillouin optical time-domain analyzers (BOTDA). The results show that, although the main noise contribution comes from the Brillouin interaction itself, a simple low pass filtering on the detected radio frequency (RF) signal reduces remarkably the noise level of the BOTDA traces. The corresponding SNR enhancement depends on the employed cut-off frequency of the low pass filter. Due to the enhancement of the SNR, a mitigation of the standard deviation error of the Brillouin frequency shift (BFS) has been demonstrated. However, RF filters with low cut-off frequency could lead to distortions on the trace signals and therefore detection errors on a non-uniform BFS. The trade-off between the noise reduction and the signal distortion as well as an optimal cut-off frequency are discussed in detail.

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