Long range Raman-Amplified Distributed Acoustic Sensor based on spontaneous Brillouin Scattering for large strain sensing

Bakhtiari Gorajoobi, Shahab, Masoudi, Ali and Brambilla, Gilberto (2022) Long range Raman-Amplified Distributed Acoustic Sensor based on spontaneous Brillouin Scattering for large strain sensing. Sensors, 22 (5), [2047]. (doi:10.3390/s22052047).

Record type: Article

Abstract

A Brillouin distributed acoustic sensor (DAS) based on optical time-domain refractometry exhibiting a maximum detectible strain of 8.7 mε and a low signal fading is developed. Strain waves with frequencies of up to 120 Hz are measured with an accuracy of 12 µε at a sampling rate of 1.2 kHz and a spatial resolution of 4 m over a sensing range of 8.5 km. The sensing range is further extended by using a modified inline Raman amplifier configuration. Using 80 ns Raman pump pulses, the signal-to-noise ratio is improved by 3.5 dB, while the accuracy of the measurement is enhanced by a factor of 2.5 to 62 µε at the far-end of a 20 km fiber

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Accepted/In Press date: 3 March 2022

Published date: 6 March 2022

Additional Information: Funding Information: Funding: This research was funded by Royal Society (CHL/R1/180350), and Natural Environment Research Council (NE/S012877/1, NE/T005890/1). Publisher Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland.

Keywords: Brillouin-OTDR, DAS, DVS, Distributed acoustic sensor, Phase-OTDR, Strain sensor

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