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30 May 2016 SNR characterization in distributed acoustic sensing
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Proceedings Volume 9916, Sixth European Workshop on Optical Fibre Sensors; 99162W (2016)
Event: Sixth European Workshop on Optical Fibre Sensors (EWOFS'2016), 2016, Limerick, Ireland
In this paper we study the SNR associated with acoustic detection in Rayleigh-based Distributed Acoustic Sensing (DAS) systems. The study is focused on phase sensitive DAS due to its superiority in terms of linearity and sensitivity. Since DAS is based on coherent interference of backscattered light from multiple scatterers it is prone to signal fading. When left unresolved, the issue of signal fading renders the associated SNR randomly dependent on position and time. Hence, its proper measurement and characterization requires statistical tools. Here such tools are introduced and a methodology for finding the mean SNR and its distribution is implemented in both experiment and simulation. It is shown that the distribution of the DAS-SNR can be obtained from the distribution of backscattered power in OTDR and the mean DAS-SNR is proportional to the energy of the interrogation pulse.
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Haniel Gabai and Avishay Eyal "SNR characterization in distributed acoustic sensing", Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 99162W (30 May 2016);

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