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High sensing accuracy realisation with millimetre/sub-millimetre resolution in optical frequency domain reflectometer

High sensing accuracy realisation with millimetre/sub-millimetre resolution in optical frequency domain reflectometer
High sensing accuracy realisation with millimetre/sub-millimetre resolution in optical frequency domain reflectometer
By effectively suppressing the nonlinear sweep noise and random range of wavelength sweep in the optical frequency domain reflectometer, the theoretical spatial resolution and uniform sweep distribution are delivered for high sensing accuracy. A strain accuracy of ±0.51 με is realised with a 5 mm sensing resolution, while the accuracy is ±5.89 με with a 1 mm sensing resolution. Theoretical limitation between the strain accuracy and sensing resolution is further studied for the sub-millimetre resolution sensing. It is found that signal to noise ratio and frequency bandwidth of the calculated cross-correlation are critical factors in measuring accuracy. Increasing the sweep range can provide a better spatial frequency step for a high signal to noise ratio in the cross-correlation. With a 130 nm sweep range, the measurement accuracy is limited to ±19.31 με with a 0.5 mm
sensing resolution. Besides, for the long-distance sensing of 104m, the measurement accuracy is ±8.72 με with a 1 mm sensing resolution
Fiber nonlinear optics, Optical fiber sensors, Optical fibers, Optical frequency domain reflectometer, Optical interferometry, Signal resolution, Spatial resolution, Wavelength measurement, accuracy, nonlinear wavelength sweep, sensing resolution
0733-8724
4050-4056
Guo, Zhen
1498b5ea-f842-4348-bf5c-60c483c83d59
Yan, Jize
786dc090-843b-435d-adbe-1d35e8fc5828
Han, Gaoce
122baece-e361-472a-8256-513369c62a78
Greenwood, David
a8f56c38-457e-4fce-bc73-798c030eecc8
Marco, James
89cfd42f-c42f-42d6-a598-2f8880ad271e
Yu, Yifei
02e7785a-f696-4327-89e0-e696ac88c149
Guo, Zhen
1498b5ea-f842-4348-bf5c-60c483c83d59
Yan, Jize
786dc090-843b-435d-adbe-1d35e8fc5828
Han, Gaoce
122baece-e361-472a-8256-513369c62a78
Greenwood, David
a8f56c38-457e-4fce-bc73-798c030eecc8
Marco, James
89cfd42f-c42f-42d6-a598-2f8880ad271e
Yu, Yifei
02e7785a-f696-4327-89e0-e696ac88c149

Guo, Zhen, Yan, Jize, Han, Gaoce, Greenwood, David, Marco, James and Yu, Yifei (2022) High sensing accuracy realisation with millimetre/sub-millimetre resolution in optical frequency domain reflectometer. IEEE Journal of Lightwave Technology, 40 (12), 4050-4056. (doi:10.1109/JLT.2022.3141596).

Record type: Article

Abstract

By effectively suppressing the nonlinear sweep noise and random range of wavelength sweep in the optical frequency domain reflectometer, the theoretical spatial resolution and uniform sweep distribution are delivered for high sensing accuracy. A strain accuracy of ±0.51 με is realised with a 5 mm sensing resolution, while the accuracy is ±5.89 με with a 1 mm sensing resolution. Theoretical limitation between the strain accuracy and sensing resolution is further studied for the sub-millimetre resolution sensing. It is found that signal to noise ratio and frequency bandwidth of the calculated cross-correlation are critical factors in measuring accuracy. Increasing the sweep range can provide a better spatial frequency step for a high signal to noise ratio in the cross-correlation. With a 130 nm sweep range, the measurement accuracy is limited to ±19.31 με with a 0.5 mm
sensing resolution. Besides, for the long-distance sensing of 104m, the measurement accuracy is ±8.72 με with a 1 mm sensing resolution

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Accepted/In Press date: 2 January 2022
e-pub ahead of print date: 10 January 2022
Keywords: Fiber nonlinear optics, Optical fiber sensors, Optical fibers, Optical frequency domain reflectometer, Optical interferometry, Signal resolution, Spatial resolution, Wavelength measurement, accuracy, nonlinear wavelength sweep, sensing resolution

Identifiers

Local EPrints ID: 457727
URI: http://eprints.soton.ac.uk/id/eprint/457727
ISSN: 0733-8724
PURE UUID: 28addb60-aa2b-4308-bd11-da6f8627aa6a
ORCID for Jize Yan: ORCID iD orcid.org/0000-0002-2886-2847

Catalogue record

Date deposited: 16 Jun 2022 00:26
Last modified: 23 Jun 2022 01:47

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Contributors

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

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