Ultra-low noise dynamic Brillouin strain sensing using combined Stokes and anti-Stokes measurements

Joseph Murray; Brandon Redding

doi:10.1117/12.2585206

12 April 2021 Ultra-low noise dynamic Brillouin strain sensing using combined Stokes and anti-Stokes measurements

Joseph Murray, Brandon Redding

Author Affiliations +

Proceedings Volume 11739, Fiber Optic Sensors and Applications XVII; 117390A (2021) https://doi.org/10.1117/12.2585206
Event: SPIE Defense + Commercial Sensing, 2021, Online Only

Abstract

We present a novel Brillouin based dynamic strain sensor that is immune to most of the technical and environmental noise sources that limit existing Brillouin sensors. In particular, we introduce a modified slope-assisted Brillouin optical time domain analysis (SA-BOTDA) system that combines information from the complex Stokes and anti-Stokes interactions to extract the Brillouin frequency shift while suppressing noise and cross-talk due to fluctuations in the power, frequency, or polarization state of the pump and probe beams. This approach enables a strain noise of 15.6 nε/Hz1/2 in ~1 km of fiber with 4 m resolution and 25 kHz bandwidth.

Conference Presentation

Citation Download Citation

Joseph Murray and Brandon Redding "Ultra-low noise dynamic Brillouin strain sensing using combined Stokes and anti-Stokes measurements", Proc. SPIE 11739, Fiber Optic Sensors and Applications XVII, 117390A (12 April 2021); https://doi.org/10.1117/12.2585206

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