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Short-range non-bending fully distributed water/humidity sensors

Short-range non-bending fully distributed water/humidity sensors
Short-range non-bending fully distributed water/humidity sensors

Existing sensing technologies lack the ability to spatially resolve multiple sources of water or humidity without relying on the deployment of numerous inline sensors. A fully distributed approach has the potential to unlock a diverse range of applications, such as humidity mapping and liquid-depth measurements. We have explored a new direction toward what is, to the best of our knowledge, the first non-bending fully distributed water/humidity sensors. This new class of sensors was made possible from the first combination of small-core exposed-core fiber, a hydrophilic polyelectrolyte multilayer coating, and coherent optical frequency-domain reflectometry. Their non-bending nature enables deployment in a wider range of environments compared to the bending type based on water-induced fiber bending. The sensing mechanism involves monitoring back-reflected optical signals created by changes in the local reflectivity due to water-induced reduction in the local refractive-index of the coating. The demonstrated average sensitivity of the sensing fiber with 10.0 bilayer polyelectrolyte multilayer coating to relative humidity varies from 0.060 to 0.001/%RH (0-38 cm distance) within a dynamic range of 26-95%RH. The distance-dependent detection limit varies between 0.3-10.0%RH (0-38 cm distance), and the spatial resolution of 4.6 mm is the smallest demonstrated for exposed-core fibers and can be vastly improved by simply broadening the swept range. The response time is 4-6 s, and the recovery time is 3-5 s. The sensing range (i.e., distance) is -0.5 m, which is more suitable for water-depth monitoring.

Distributed, exposed core, frequency, humidity, hygrometer, OFDR, optical fiber, polyelectrolyte coating, reflectometry, sensor, water
0733-8724
2014-2022
Chen, George Y.
b766d3f7-a6dc-4c15-8f00-17ad044348c1
Wu, Xuan
f6df6b7a-8de6-4dae-af4c-1d89228ae531
Schartner, Erik P.
600d0555-48c8-4854-90bc-1eef2b68eb3c
Shahnia, Soroush
a7468ef1-5db5-4359-8101-ee12fcddb79f
Hebert, Nicolas Bourbeau
ca244879-6fbc-46b8-af0e-cb5e4a7430bd
Yu, Li
ba6d107a-4a5e-4065-8fb4-12de5fc22c2f
Liu, Xiaokong
54c5eb00-0862-4397-b1b0-f94cac2a0275
Shahraam, Afshar V.
7437005b-3f34-499d-a656-b250a9e1c8ee
Newson, Trevor P.
6735857e-d947-45ec-8163-54ebb25daad7
Ebendorff-Heidepriem, Heike
83fc0e57-ee8c-4e7d-ab6f-5fd7074f4bc8
Xu, Haolan
2bae2417-d547-44ec-8c0f-e57d052f98b0
Lancaster, David G.
4c1e2bb1-fa1a-4a42-86eb-58025c753e06
Monro, Tanya M.
20e60474-c0f6-4c5e-af89-e8bd3c6fc43c
Chen, George Y.
b766d3f7-a6dc-4c15-8f00-17ad044348c1
Wu, Xuan
f6df6b7a-8de6-4dae-af4c-1d89228ae531
Schartner, Erik P.
600d0555-48c8-4854-90bc-1eef2b68eb3c
Shahnia, Soroush
a7468ef1-5db5-4359-8101-ee12fcddb79f
Hebert, Nicolas Bourbeau
ca244879-6fbc-46b8-af0e-cb5e4a7430bd
Yu, Li
ba6d107a-4a5e-4065-8fb4-12de5fc22c2f
Liu, Xiaokong
54c5eb00-0862-4397-b1b0-f94cac2a0275
Shahraam, Afshar V.
7437005b-3f34-499d-a656-b250a9e1c8ee
Newson, Trevor P.
6735857e-d947-45ec-8163-54ebb25daad7
Ebendorff-Heidepriem, Heike
83fc0e57-ee8c-4e7d-ab6f-5fd7074f4bc8
Xu, Haolan
2bae2417-d547-44ec-8c0f-e57d052f98b0
Lancaster, David G.
4c1e2bb1-fa1a-4a42-86eb-58025c753e06
Monro, Tanya M.
20e60474-c0f6-4c5e-af89-e8bd3c6fc43c

Chen, George Y., Wu, Xuan, Schartner, Erik P., Shahnia, Soroush, Hebert, Nicolas Bourbeau, Yu, Li, Liu, Xiaokong, Shahraam, Afshar V., Newson, Trevor P., Ebendorff-Heidepriem, Heike, Xu, Haolan, Lancaster, David G. and Monro, Tanya M. (2019) Short-range non-bending fully distributed water/humidity sensors. Journal of Lightwave Technology, 37 (9), 2014-2022, [8639067]. (doi:10.1109/JLT.2019.2897346).

Record type: Article

Abstract

Existing sensing technologies lack the ability to spatially resolve multiple sources of water or humidity without relying on the deployment of numerous inline sensors. A fully distributed approach has the potential to unlock a diverse range of applications, such as humidity mapping and liquid-depth measurements. We have explored a new direction toward what is, to the best of our knowledge, the first non-bending fully distributed water/humidity sensors. This new class of sensors was made possible from the first combination of small-core exposed-core fiber, a hydrophilic polyelectrolyte multilayer coating, and coherent optical frequency-domain reflectometry. Their non-bending nature enables deployment in a wider range of environments compared to the bending type based on water-induced fiber bending. The sensing mechanism involves monitoring back-reflected optical signals created by changes in the local reflectivity due to water-induced reduction in the local refractive-index of the coating. The demonstrated average sensitivity of the sensing fiber with 10.0 bilayer polyelectrolyte multilayer coating to relative humidity varies from 0.060 to 0.001/%RH (0-38 cm distance) within a dynamic range of 26-95%RH. The distance-dependent detection limit varies between 0.3-10.0%RH (0-38 cm distance), and the spatial resolution of 4.6 mm is the smallest demonstrated for exposed-core fibers and can be vastly improved by simply broadening the swept range. The response time is 4-6 s, and the recovery time is 3-5 s. The sensing range (i.e., distance) is -0.5 m, which is more suitable for water-depth monitoring.

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More information

Accepted/In Press date: 1 February 2019
e-pub ahead of print date: 11 February 2019
Published date: 1 May 2019
Keywords: Distributed, exposed core, frequency, humidity, hygrometer, OFDR, optical fiber, polyelectrolyte coating, reflectometry, sensor, water

Identifiers

Local EPrints ID: 430946
URI: http://eprints.soton.ac.uk/id/eprint/430946
ISSN: 0733-8724
PURE UUID: 2638f96d-6def-41f3-bdad-f0bb83a723a4

Catalogue record

Date deposited: 17 May 2019 16:30
Last modified: 07 Oct 2020 00:16

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Contributors

Author: George Y. Chen
Author: Xuan Wu
Author: Erik P. Schartner
Author: Soroush Shahnia
Author: Nicolas Bourbeau Hebert
Author: Li Yu
Author: Xiaokong Liu
Author: Afshar V. Shahraam
Author: Heike Ebendorff-Heidepriem
Author: Haolan Xu
Author: David G. Lancaster
Author: Tanya M. Monro

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