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Denoising of BOTDR Dynamic Strain Measurement Using Convolutional Neural Networks.

Published version
Peer-reviewed

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Authors

Li, Bo 
Han, Xiaole 

Abstract

The Brillouin optical time domain reflectometry (BOTDR) system measures the distributed strain and temperature information along the optic fibre by detecting the Brillouin gain spectra (BGS) and finding the Brillouin frequency shift profiles. By introducing small gain stimulated Brillouin scattering (SBS), dynamic measurement using BOTDR can be realized, but the performance is limited due to the noise of the detected information. An image denoising method using the convolutional neural network (CNN) is applied to the derived Brillouin gain spectrum images to enhance the performance of the Brillouin frequency shift detection and the strain vibration measurement of the BOTDR system. By reducing the noise of the BGS images along the length of the fibre under test with different network depths and epoch numbers, smaller frequency uncertainties are obtained, and the sine-fitting R-squared values of the detected strain vibration profiles are also higher. The Brillouin frequency uncertainty is improved by 24% and the sine-fitting R-squared value of the obtained strain vibration profile is enhanced to 0.739, with eight layers of total depth and 200 epochs.

Description

Peer reviewed: True

Keywords

Brillouin scattering, convolutional neural network, fibre optic sensing, image denoising

Journal Title

Sensors (Basel)

Conference Name

Journal ISSN

1424-8220
1424-8220

Volume Title

Publisher

MDPI AG
Sponsorship
Fundamental Research Funds for the Central Universities (2242022k30055)
Hawaii Department of Transportation (2020-4R-SUPP)