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Enhanced bandwidth distributed acoustic sensing using a frequency multiplexed pulse train and micro-machined point reflector fiber

Enhanced bandwidth distributed acoustic sensing using a frequency multiplexed pulse train and micro-machined point reflector fiber
Enhanced bandwidth distributed acoustic sensing using a frequency multiplexed pulse train and micro-machined point reflector fiber
In this Letter, we present an enhanced bandwidth distributed acoustic sensor (DAS) that uses a frequency multiplexed interrogation system to probe a micro-machined point reflector fiber. The fiber contains a series of discrete point reflectors with reflectance as high as -48 dB, while the frequency multiplexed interrogator allows us to increase the effective pulse repetition rate by a factor of 10. Together, this enables a phase noise as low as -101 dB (re rad2/Hz) for a 2.5 km fiber with 10 m spatial resolution, corresponding to a strain noise of 0.095p ε/Hz. This scheme also enables a 10-fold increase in the sensor bandwidth without introducing noise due to interference fading. Finally, we demonstrate sensing at ranges up to 10 km using a fiber containing 1000 point reflectors, illustrating the scalability of this approach.
0146-9592
529-532
Beresna, Martynas
a6dc062e-93c6-46a5-aeb3-8de332cdec7b
Lee, Timothy
beb3b88e-3e5a-4c3f-8636-bb6de8040fcc
Ogden, Hannah M.
353be0b3-e886-4641-a9e1-8e502f979133
Redding, Brandon
c91fca68-1448-4269-9012-836f2650f083
Beresna, Martynas
a6dc062e-93c6-46a5-aeb3-8de332cdec7b
Lee, Timothy
beb3b88e-3e5a-4c3f-8636-bb6de8040fcc
Ogden, Hannah M.
353be0b3-e886-4641-a9e1-8e502f979133
Redding, Brandon
c91fca68-1448-4269-9012-836f2650f083

Beresna, Martynas, Lee, Timothy, Ogden, Hannah M. and Redding, Brandon (2022) Enhanced bandwidth distributed acoustic sensing using a frequency multiplexed pulse train and micro-machined point reflector fiber. Optics Letters, 47 (3), 529-532. (doi:10.1364/OL.449223).

Record type: Article

Abstract

In this Letter, we present an enhanced bandwidth distributed acoustic sensor (DAS) that uses a frequency multiplexed interrogation system to probe a micro-machined point reflector fiber. The fiber contains a series of discrete point reflectors with reflectance as high as -48 dB, while the frequency multiplexed interrogator allows us to increase the effective pulse repetition rate by a factor of 10. Together, this enables a phase noise as low as -101 dB (re rad2/Hz) for a 2.5 km fiber with 10 m spatial resolution, corresponding to a strain noise of 0.095p ε/Hz. This scheme also enables a 10-fold increase in the sensor bandwidth without introducing noise due to interference fading. Finally, we demonstrate sensing at ranges up to 10 km using a fiber containing 1000 point reflectors, illustrating the scalability of this approach.

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pt_reflector_OL_FINAL_submission_20211221 - Accepted Manuscript
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Accepted/In Press date: 22 December 2021
e-pub ahead of print date: 20 January 2022
Published date: 1 February 2022
Additional Information: Funding Information: U.S. Naval Research Laboratory. Publisher Copyright: © 2022 Optica Publishing Group

Identifiers

Local EPrints ID: 455911
URI: http://eprints.soton.ac.uk/id/eprint/455911
ISSN: 0146-9592
PURE UUID: 631f9a60-671c-4458-be4f-f96c4bdcec80
ORCID for Timothy Lee: ORCID iD orcid.org/0000-0001-9665-5578

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Date deposited: 07 Apr 2022 17:01
Last modified: 07 Feb 2023 05:09

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Contributors

Author: Timothy Lee ORCID iD
Author: Hannah M. Ogden
Author: Brandon Redding

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