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Surface-mounted tilt sensor using fiber Bragg grating technology for engineered slope monitoring with temperature compensation

Surface-mounted tilt sensor using fiber Bragg grating technology for engineered slope monitoring with temperature compensation
Surface-mounted tilt sensor using fiber Bragg grating technology for engineered slope monitoring with temperature compensation

A surface-mounted tilt sensor was designed and fabricated to measure the inclination angle of engineered structures or slopes in two directions. The device utilizes two strain-sensitive fiber Bragg gratings (FBGs) for tilt angle measurement bidirectionally and one strain-free FBG to provide temperature compensation. In this work, a tilt sensor prototype was fabricated using a 3-D printer, with a robust enclosure and a miniature actuator with dimensions of 115 × 65 × 30 mm and 45 × 20 × 3 mm, respectively. The device was first calibrated in the laboratory for tilt and temperature parameters. For tilt calibration, the device yields a sensitivity value of 0.0135 and 0.0123 nm/° for + x- and- x -directions. On the other hand, the device delivers a sensitivity value of 0.0105 nm/°C as the response to temperature changes. The tilt sensor was also tested for suitability in a real-field deployment where it was installed on a retaining wall and was left for four weeks. The field test data indicate no vertical displacement of the wall since the device exhibits zero inclination changes during the test period. This compact, robust, and easy-to-install tilt sensor has excellent potential for various geotechnical applications, mainly in landslide detections, ground movement, and engineered slope monitoring.

Engineered slope monitoring, fiber Bragg gratings (FBGs), ground movement, landslides, tilt sensor
1530-437X
12828-12837
Sa'ad, M.S.M.
08686d35-c75f-41ec-ac1d-98d958a3f37e
Ahmad, H.
4485923c-0746-46dd-b8be-7f87b1317330
Alias, M.A.
572a6cc7-0b9a-479c-a7eb-29f0d8bfd808
Zaini, M.K.A.
9490bb46-b873-4fcc-945c-92adb37baa5a
Lim, K.S.
62cba7b4-2e01-4d43-bb85-e928a8874325
Harun, S.W.
d3e9713f-9eb8-4f28-a20e-30dc7f869ce0
Grattan, K.T.V.
2c12919a-59bd-4427-96ef-4d8c685c9893
Rahman, B.M.A.
c6088251-1bf5-49d6-8700-686f4589a146
Brambilla, G.
815d9712-62c7-47d1-8860-9451a363a6c8
Reduan, S.A.
05d0c1af-a599-4d57-898d-e1780b913d54
Bayang, L.
29b5fd27-fb21-40ac-90cc-632aad118e2e
Ismail, M.F.
65f2b6e4-25e0-4ab2-b8bb-dc687b307434
Sa'ad, M.S.M.
08686d35-c75f-41ec-ac1d-98d958a3f37e
Ahmad, H.
4485923c-0746-46dd-b8be-7f87b1317330
Alias, M.A.
572a6cc7-0b9a-479c-a7eb-29f0d8bfd808
Zaini, M.K.A.
9490bb46-b873-4fcc-945c-92adb37baa5a
Lim, K.S.
62cba7b4-2e01-4d43-bb85-e928a8874325
Harun, S.W.
d3e9713f-9eb8-4f28-a20e-30dc7f869ce0
Grattan, K.T.V.
2c12919a-59bd-4427-96ef-4d8c685c9893
Rahman, B.M.A.
c6088251-1bf5-49d6-8700-686f4589a146
Brambilla, G.
815d9712-62c7-47d1-8860-9451a363a6c8
Reduan, S.A.
05d0c1af-a599-4d57-898d-e1780b913d54
Bayang, L.
29b5fd27-fb21-40ac-90cc-632aad118e2e
Ismail, M.F.
65f2b6e4-25e0-4ab2-b8bb-dc687b307434

Sa'ad, M.S.M., Ahmad, H., Alias, M.A., Zaini, M.K.A., Lim, K.S., Harun, S.W., Grattan, K.T.V., Rahman, B.M.A., Brambilla, G., Reduan, S.A., Bayang, L. and Ismail, M.F. (2023) Surface-mounted tilt sensor using fiber Bragg grating technology for engineered slope monitoring with temperature compensation. IEEE Sensors Journal, 23 (12), 12828-12837. (doi:10.1109/JSEN.2023.3268649).

Record type: Article

Abstract

A surface-mounted tilt sensor was designed and fabricated to measure the inclination angle of engineered structures or slopes in two directions. The device utilizes two strain-sensitive fiber Bragg gratings (FBGs) for tilt angle measurement bidirectionally and one strain-free FBG to provide temperature compensation. In this work, a tilt sensor prototype was fabricated using a 3-D printer, with a robust enclosure and a miniature actuator with dimensions of 115 × 65 × 30 mm and 45 × 20 × 3 mm, respectively. The device was first calibrated in the laboratory for tilt and temperature parameters. For tilt calibration, the device yields a sensitivity value of 0.0135 and 0.0123 nm/° for + x- and- x -directions. On the other hand, the device delivers a sensitivity value of 0.0105 nm/°C as the response to temperature changes. The tilt sensor was also tested for suitability in a real-field deployment where it was installed on a retaining wall and was left for four weeks. The field test data indicate no vertical displacement of the wall since the device exhibits zero inclination changes during the test period. This compact, robust, and easy-to-install tilt sensor has excellent potential for various geotechnical applications, mainly in landslide detections, ground movement, and engineered slope monitoring.

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More information

e-pub ahead of print date: 15 June 2023
Keywords: Engineered slope monitoring, fiber Bragg gratings (FBGs), ground movement, landslides, tilt sensor

Identifiers

Local EPrints ID: 481538
URI: http://eprints.soton.ac.uk/id/eprint/481538
ISSN: 1530-437X
PURE UUID: f88fe085-2e86-435b-88ff-f2d1c29da1e6
ORCID for G. Brambilla: ORCID iD orcid.org/0000-0002-5730-0499

Catalogue record

Date deposited: 31 Aug 2023 16:57
Last modified: 18 Mar 2024 02:53

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Contributors

Author: M.S.M. Sa'ad
Author: H. Ahmad
Author: M.A. Alias
Author: M.K.A. Zaini
Author: K.S. Lim
Author: S.W. Harun
Author: K.T.V. Grattan
Author: B.M.A. Rahman
Author: G. Brambilla ORCID iD
Author: S.A. Reduan
Author: L. Bayang
Author: M.F. Ismail

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