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Ultimate spatial resolution realisation in optical frequency domain reflectometry with equal frequency resampling

Ultimate spatial resolution realisation in optical frequency domain reflectometry with equal frequency resampling
Ultimate spatial resolution realisation in optical frequency domain reflectometry with equal frequency resampling
A method based on equal frequency resampling is proposed to suppress laser nonlinear frequency sweeping for the ultimate spatial resolution in optical frequency domain reflectometry. Estimation inaccuracy of the sweeping frequency distribution caused by the finite sampling rate in the auxiliary interferometer can be efficiently compensated by the equal frequency resampling method. With the sweeping range of 130 nm, a 12.1 µm spatial resolution is experimentally obtained. In addition, the sampling limitation of the auxiliary interferometer-based correction is discussed. With a 200 m optical path delay in the auxiliary interferometer, a 21.3 µm spatial resolution is realised
at the 191 m fibre end. By employing the proposed resampling and a drawing tower FBG array to enhance the Rayleigh backscattering, a distributed temperature sensing over a 105 m fibre with a sensing resolution of 1 cm is achieved. The measured temperature uncertainty is limited to ±0.15 ºC.
distributed optical fibre sensor, nonlinear frequency sweeping, optical frequency domain reflectometry (OFDR), spatial resolution
1424-8220
Guo, Zhen
725bf880-b7ac-4687-879c-ee1ffd63041e
Han, Gaoce
122baece-e361-472a-8256-513369c62a78
Yan, Jize
786dc090-843b-435d-adbe-1d35e8fc5828
Greenwood, David
6a8f8e1e-d6e4-4d43-84dd-79b15eb61c8b
Marco, James
782bfbf7-2bdb-4cfe-97ef-f0223465634a
Yu, Yifei
0421a794-b155-46e0-8cd7-5f66f3330a40
Guo, Zhen
725bf880-b7ac-4687-879c-ee1ffd63041e
Han, Gaoce
122baece-e361-472a-8256-513369c62a78
Yan, Jize
786dc090-843b-435d-adbe-1d35e8fc5828
Greenwood, David
6a8f8e1e-d6e4-4d43-84dd-79b15eb61c8b
Marco, James
782bfbf7-2bdb-4cfe-97ef-f0223465634a
Yu, Yifei
0421a794-b155-46e0-8cd7-5f66f3330a40

Guo, Zhen, Han, Gaoce, Yan, Jize, Greenwood, David, Marco, James and Yu, Yifei (2021) Ultimate spatial resolution realisation in optical frequency domain reflectometry with equal frequency resampling. Sensors, 21 (14), [4632]. (doi:10.3390/s21144632).

Record type: Article

Abstract

A method based on equal frequency resampling is proposed to suppress laser nonlinear frequency sweeping for the ultimate spatial resolution in optical frequency domain reflectometry. Estimation inaccuracy of the sweeping frequency distribution caused by the finite sampling rate in the auxiliary interferometer can be efficiently compensated by the equal frequency resampling method. With the sweeping range of 130 nm, a 12.1 µm spatial resolution is experimentally obtained. In addition, the sampling limitation of the auxiliary interferometer-based correction is discussed. With a 200 m optical path delay in the auxiliary interferometer, a 21.3 µm spatial resolution is realised
at the 191 m fibre end. By employing the proposed resampling and a drawing tower FBG array to enhance the Rayleigh backscattering, a distributed temperature sensing over a 105 m fibre with a sensing resolution of 1 cm is achieved. The measured temperature uncertainty is limited to ±0.15 ºC.

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Ultimate Spatial Resolution Realisation in Optical Frequency Domain Reflectometry with Equal Frequency Resampling - Version of Record
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Submitted date: 31 May 2021
Accepted/In Press date: 29 June 2021
Published date: 6 July 2021
Keywords: distributed optical fibre sensor, nonlinear frequency sweeping, optical frequency domain reflectometry (OFDR), spatial resolution

Identifiers

Local EPrints ID: 450684
URI: http://eprints.soton.ac.uk/id/eprint/450684
ISSN: 1424-8220
PURE UUID: 0425925c-bad4-4756-8d74-965a00c299df
ORCID for Jize Yan: ORCID iD orcid.org/0000-0002-2886-2847

Catalogue record

Date deposited: 06 Aug 2021 16:31
Last modified: 28 Apr 2022 02:13

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Contributors

Author: Zhen Guo
Author: Gaoce Han
Author: Jize Yan ORCID iD
Author: David Greenwood
Author: James Marco
Author: Yifei Yu

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