Journal
SENSORS
Volume 19, Issue 13, Pages -Publisher
MDPI
DOI: 10.3390/s19132878
Keywords
stimulated brillouin scattering; Brillouin optical time-domain analyzers; fiber optics sensors; distributed optical sensing; radio frequency filtering
Funding
- German Research Foundation [DFG SCHN 716/13-1]
- Niedersachsisches Vorab (NL-4 Project QUANOMET)
- Iraqi Ministry of Oil/State Company for Oil Projects (SCOP)
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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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