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Temperature Compensation of Fiber Bragg Grating Sensors in Smart Strand

Compared to other types of sensors, fiber optic sensors have improved accuracy and durability. Recently, the Smart Strand was developed to maximize the advantages of fiber optic sensors for measuring the cable forces in prestressed concrete structures or cable-supported bridges. The Smart Strand has...

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Autores principales: Jeon, Se-Jin, Park, Sung Yong, Kim, Sung Tae
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9106026/
https://www.ncbi.nlm.nih.gov/pubmed/35590971
http://dx.doi.org/10.3390/s22093282
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author Jeon, Se-Jin
Park, Sung Yong
Kim, Sung Tae
author_facet Jeon, Se-Jin
Park, Sung Yong
Kim, Sung Tae
author_sort Jeon, Se-Jin
collection PubMed
description Compared to other types of sensors, fiber optic sensors have improved accuracy and durability. Recently, the Smart Strand was developed to maximize the advantages of fiber optic sensors for measuring the cable forces in prestressed concrete structures or cable-supported bridges. The Smart Strand has fiber Bragg gratings (FBGs) embedded in a core wire of the seven-wire strand. Similar to other sensors, the strain measured at an FBG is affected by temperature; therefore, the temperature effect that is not related to the mechanical strain should be compensated for or corrected in the long-term measurement subjected to temperature variation. However, a temperature compensation procedure for the FBG has yet to be established, and relevant studies have used different formulas for the compensation. Moreover, when the FBG sensors are packaged with a certain material—such as fiber reinforced polymer—for protection, it is important to consider the interaction between the FBG, packaging material, and host material during thermal behavior. Therefore, this study proposed a reasonable procedure for temperature compensation for the FBG sensors embedded in packaging material and host material. In particular, the thermal sensitivity of the Smart Strand was intensively investigated. The proposed theoretical formulas were validated through comparison with data obtained from various specimens in a temperature-controlled chamber. Finally, the procedure was applied to correct the data measured using the Smart Strands in a 20-m-long full-scale specimen for about a year, thus resulting in a realistic trend of the long-term prestressing force.
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spelling pubmed-91060262022-05-14 Temperature Compensation of Fiber Bragg Grating Sensors in Smart Strand Jeon, Se-Jin Park, Sung Yong Kim, Sung Tae Sensors (Basel) Article Compared to other types of sensors, fiber optic sensors have improved accuracy and durability. Recently, the Smart Strand was developed to maximize the advantages of fiber optic sensors for measuring the cable forces in prestressed concrete structures or cable-supported bridges. The Smart Strand has fiber Bragg gratings (FBGs) embedded in a core wire of the seven-wire strand. Similar to other sensors, the strain measured at an FBG is affected by temperature; therefore, the temperature effect that is not related to the mechanical strain should be compensated for or corrected in the long-term measurement subjected to temperature variation. However, a temperature compensation procedure for the FBG has yet to be established, and relevant studies have used different formulas for the compensation. Moreover, when the FBG sensors are packaged with a certain material—such as fiber reinforced polymer—for protection, it is important to consider the interaction between the FBG, packaging material, and host material during thermal behavior. Therefore, this study proposed a reasonable procedure for temperature compensation for the FBG sensors embedded in packaging material and host material. In particular, the thermal sensitivity of the Smart Strand was intensively investigated. The proposed theoretical formulas were validated through comparison with data obtained from various specimens in a temperature-controlled chamber. Finally, the procedure was applied to correct the data measured using the Smart Strands in a 20-m-long full-scale specimen for about a year, thus resulting in a realistic trend of the long-term prestressing force. MDPI 2022-04-25 /pmc/articles/PMC9106026/ /pubmed/35590971 http://dx.doi.org/10.3390/s22093282 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Jeon, Se-Jin
Park, Sung Yong
Kim, Sung Tae
Temperature Compensation of Fiber Bragg Grating Sensors in Smart Strand
title Temperature Compensation of Fiber Bragg Grating Sensors in Smart Strand
title_full Temperature Compensation of Fiber Bragg Grating Sensors in Smart Strand
title_fullStr Temperature Compensation of Fiber Bragg Grating Sensors in Smart Strand
title_full_unstemmed Temperature Compensation of Fiber Bragg Grating Sensors in Smart Strand
title_short Temperature Compensation of Fiber Bragg Grating Sensors in Smart Strand
title_sort temperature compensation of fiber bragg grating sensors in smart strand
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9106026/
https://www.ncbi.nlm.nih.gov/pubmed/35590971
http://dx.doi.org/10.3390/s22093282
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