20 May 2013 High spatial resolution BOTDA using simultaneously launched gain and loss pump pulses
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Proceedings Volume 8794, Fifth European Workshop on Optical Fibre Sensors; 87943L (2013) https://doi.org/10.1117/12.2026670
Event: Fifth European Workshop on Optical Fibre Sensors, 2013, Krakow, Poland
Abstract
We report a 10cm spatial resolution in a Brillouin-based distributed sensing system using two simultaneously launched gain and loss pump pulses, having slightly different durations. Post-recording subtraction of the probe signal, excited by the shorter pulse, from the corresponding one, obtained from the longer pump pulse, is no longer required, since it is done automatically by the overlapping parts of the gain and loss pump pulses. Using a 30ns gain pump pulse and a 29ns loss pump pulse we were able to improve upon previously published results, achieving a distributed strain measurement along a standard single mode optical fiber with a spatial resolution of ~10cm. This technique does not broaden the involved Brillouin gain spectra so that the strain/temperature sensitivity is not compromised.
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A. Motil, O. Danon, Y. Peled, M. Tur, "High spatial resolution BOTDA using simultaneously launched gain and loss pump pulses", Proc. SPIE 8794, Fifth European Workshop on Optical Fibre Sensors, 87943L (20 May 2013); doi: 10.1117/12.2026670; https://doi.org/10.1117/12.2026670
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