Quantitative amplitude-measuring multimode fiber OTDR sensor using speckle pattern tracking

Matthew J. Murray; Clay Kirkendall; Brandon Redding

doi:10.1117/12.2585215

12 April 2021 Quantitative amplitude-measuring multimode fiber OTDR sensor using speckle pattern tracking

Matthew J. Murray, Clay Kirkendall, Brandon Redding

Proceedings Volume 11739, Fiber Optic Sensors and Applications XVII; 1173907 (2021) https://doi.org/10.1117/12.2585215
Event: SPIE Defense + Commercial Sensing, 2021, Online Only

Abstract

Here, we demonstrate a multimode fiber Rayleigh-based sensor that can make quantitative strain measurements by tracking the amplitude of the backscattered speckle pattern recorded on a high-speed camera. The diversity of spatial modes provides sufficient information to recover both the magnitude and algebraic sign of the strain. Amplitude-measuring multimode fiber Rayleigh sensors have reduced sensitivity to laser phase noise, have higher thresholds for nonlinear effects, improving noise performance, and are completely immune to interference fading. The sensor presented here achieves pε/√Hz-level noise, over 10 kHz of bandwidth, and operates at a range of up to 2 km.

Conference Presentation

Citation Download Citation

Matthew J. Murray, Clay Kirkendall, and Brandon Redding "Quantitative amplitude-measuring multimode fiber OTDR sensor using speckle pattern tracking", Proc. SPIE 11739, Fiber Optic Sensors and Applications XVII, 1173907 (12 April 2021); https://doi.org/10.1117/12.2585215

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