Thermal Influence on Long-Distance Optical Measurement of Suspension Bridge Displacement

Detalhes bibliográficos
Autor(a) principal: Lages Martins, L.
Data de Publicação: 2014
Outros Autores: Rebordão, J., Ribeiro, A.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://repositorio.lnec.pt:8080/jspui/handle/123456789/1006701
Resumo: This paper discusses the thermal influence on long-distance and noncontact measurement of suspension bridge three-dimensional displacement by the use of an optical system composed of a digital camera, infrared active targets, and computational support. ln this type of measurement method, the optical propagation path of light through the air can range from 250 m up to 750 m, making its measurement accuracy strongly dependent on atmospheric refraction and turbulence, phenomena that are linked to the vertical temperature gradient between the camera and targets. ln addition, the adopted measurement geometrical configuration can lead to a height difference between these two elements (camera and targets) above 50 m. The paper describes the experimental setup and procedure followed for the determination of local temperature vertical gradients in the 25th of April Bridge in Lisbon (Portugal), where an optical measurement system was applied. The obtained thermal measurements are presented and applied in the evaluation of the systematic refraction vertical deviation, based on appropriate mathematical models mentioned in the paper, and for the identification of stable or unstable observation thermal conditions related to turbulence.
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spelling Thermal Influence on Long-Distance Optical Measurement of Suspension Bridge DisplacementDisplacementOptical systemSuspension bridgeTemperatureThis paper discusses the thermal influence on long-distance and noncontact measurement of suspension bridge three-dimensional displacement by the use of an optical system composed of a digital camera, infrared active targets, and computational support. ln this type of measurement method, the optical propagation path of light through the air can range from 250 m up to 750 m, making its measurement accuracy strongly dependent on atmospheric refraction and turbulence, phenomena that are linked to the vertical temperature gradient between the camera and targets. ln addition, the adopted measurement geometrical configuration can lead to a height difference between these two elements (camera and targets) above 50 m. The paper describes the experimental setup and procedure followed for the determination of local temperature vertical gradients in the 25th of April Bridge in Lisbon (Portugal), where an optical measurement system was applied. The obtained thermal measurements are presented and applied in the evaluation of the systematic refraction vertical deviation, based on appropriate mathematical models mentioned in the paper, and for the identification of stable or unstable observation thermal conditions related to turbulence.2014-12-12T10:09:12Z2017-04-12T11:07:38Z2014-01-01T00:00:00Z2014-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://repositorio.lnec.pt:8080/jspui/handle/123456789/1006701eng0195-928XDOI 10.1007/s10765-014-1607-3Lages Martins, L.Rebordão, J.Ribeiro, A.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-09-28T03:01:52Zoai:localhost:123456789/1006701Portal AgregadorONGhttps://www.rcaap.pt/oai/openairemluisa.alvim@gmail.comopendoar:71602024-09-28T03:01:52Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Thermal Influence on Long-Distance Optical Measurement of Suspension Bridge Displacement
title Thermal Influence on Long-Distance Optical Measurement of Suspension Bridge Displacement
spellingShingle Thermal Influence on Long-Distance Optical Measurement of Suspension Bridge Displacement
Lages Martins, L.
Displacement
Optical system
Suspension bridge
Temperature
title_short Thermal Influence on Long-Distance Optical Measurement of Suspension Bridge Displacement
title_full Thermal Influence on Long-Distance Optical Measurement of Suspension Bridge Displacement
title_fullStr Thermal Influence on Long-Distance Optical Measurement of Suspension Bridge Displacement
title_full_unstemmed Thermal Influence on Long-Distance Optical Measurement of Suspension Bridge Displacement
title_sort Thermal Influence on Long-Distance Optical Measurement of Suspension Bridge Displacement
author Lages Martins, L.
author_facet Lages Martins, L.
Rebordão, J.
Ribeiro, A.
author_role author
author2 Rebordão, J.
Ribeiro, A.
author2_role author
author
dc.contributor.author.fl_str_mv Lages Martins, L.
Rebordão, J.
Ribeiro, A.
dc.subject.por.fl_str_mv Displacement
Optical system
Suspension bridge
Temperature
topic Displacement
Optical system
Suspension bridge
Temperature
description This paper discusses the thermal influence on long-distance and noncontact measurement of suspension bridge three-dimensional displacement by the use of an optical system composed of a digital camera, infrared active targets, and computational support. ln this type of measurement method, the optical propagation path of light through the air can range from 250 m up to 750 m, making its measurement accuracy strongly dependent on atmospheric refraction and turbulence, phenomena that are linked to the vertical temperature gradient between the camera and targets. ln addition, the adopted measurement geometrical configuration can lead to a height difference between these two elements (camera and targets) above 50 m. The paper describes the experimental setup and procedure followed for the determination of local temperature vertical gradients in the 25th of April Bridge in Lisbon (Portugal), where an optical measurement system was applied. The obtained thermal measurements are presented and applied in the evaluation of the systematic refraction vertical deviation, based on appropriate mathematical models mentioned in the paper, and for the identification of stable or unstable observation thermal conditions related to turbulence.
publishDate 2014
dc.date.none.fl_str_mv 2014-12-12T10:09:12Z
2014-01-01T00:00:00Z
2014-01
2017-04-12T11:07:38Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://repositorio.lnec.pt:8080/jspui/handle/123456789/1006701
url http://repositorio.lnec.pt:8080/jspui/handle/123456789/1006701
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 0195-928X
DOI 10.1007/s10765-014-1607-3
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv mluisa.alvim@gmail.com
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