OCDMA-Based Sensor Network for Monitoring Construction Sites Affected by Vibrations

Farzad Rahimian, Saleh Seyedzadeh, Ivan Glesk

Research output: Contribution to journalArticle

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Abstract

Due to the progressive demand for more accurate structural health monitoring of large-scale facilities, e.g. modern high-speed railways and bridges, there is a huge uptake in the development of optical sensor networks (OSN), which can help mitigate the issues with conventional electric sensors, especially their sensitivity to electromagnetic interferences and larger sizes. The existing fibre optic infrastructures are not widely used by OSNs, due to the lack of appropriate multiplexing techniques. Aiming at addressing the implementation issues of optical sensors in urban areas, this study proposes an efficient and cost-effective system for supporting the vibration sensing of unequally distributed points. The proposed system takes the advantages of spectral amplitude encoding optical code division multiple access (SAC-OCDMA) technique, in providing differentiated services in the physical layer with varying code weights. This system utilises more wavelengths (i.e. higher power) to the farthest sensing points in order to retrieve vibration signals, properly. The mechanism of SAC for OSN is elaborated using simulation results including the impact of transmission distance and the procedure of allocating codes to different zones. These results indicate the suitability of the proposed system to be implemented in existing fibre optic infrastructures. Moreover, the numerical analysis shows a high capacity of the sensor network deploying SAC. The proposed system contributes to the construction research and practice by addressing the implementation issues of structural health monitoring of large-scale facilities in urban areas.
Original languageEnglish
JournalJournal of Information Technology in Construction
Publication statusPublished - 13 Jun 2019

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Optical sensors
Sensor networks
Structural health monitoring
Fiber optics
Monitoring
Signal interference
Multiplexing
Code division multiple access
Numerical analysis
Wavelength
Sensors
Costs

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title = "OCDMA-Based Sensor Network for Monitoring Construction Sites Affected by Vibrations",
abstract = "Due to the progressive demand for more accurate structural health monitoring of large-scale facilities, e.g. modern high-speed railways and bridges, there is a huge uptake in the development of optical sensor networks (OSN), which can help mitigate the issues with conventional electric sensors, especially their sensitivity to electromagnetic interferences and larger sizes. The existing fibre optic infrastructures are not widely used by OSNs, due to the lack of appropriate multiplexing techniques. Aiming at addressing the implementation issues of optical sensors in urban areas, this study proposes an efficient and cost-effective system for supporting the vibration sensing of unequally distributed points. The proposed system takes the advantages of spectral amplitude encoding optical code division multiple access (SAC-OCDMA) technique, in providing differentiated services in the physical layer with varying code weights. This system utilises more wavelengths (i.e. higher power) to the farthest sensing points in order to retrieve vibration signals, properly. The mechanism of SAC for OSN is elaborated using simulation results including the impact of transmission distance and the procedure of allocating codes to different zones. These results indicate the suitability of the proposed system to be implemented in existing fibre optic infrastructures. Moreover, the numerical analysis shows a high capacity of the sensor network deploying SAC. The proposed system contributes to the construction research and practice by addressing the implementation issues of structural health monitoring of large-scale facilities in urban areas.",
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year = "2019",
month = "6",
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language = "English",
journal = "Journal of Information Technology in Construction",
issn = "1874-4753",
publisher = "International Council for Research and Innovation in Building and Construction",

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OCDMA-Based Sensor Network for Monitoring Construction Sites Affected by Vibrations. / Rahimian, Farzad; Seyedzadeh, Saleh; Glesk, Ivan.

In: Journal of Information Technology in Construction, 13.06.2019.

Research output: Contribution to journalArticle

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AU - Seyedzadeh, Saleh

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AB - Due to the progressive demand for more accurate structural health monitoring of large-scale facilities, e.g. modern high-speed railways and bridges, there is a huge uptake in the development of optical sensor networks (OSN), which can help mitigate the issues with conventional electric sensors, especially their sensitivity to electromagnetic interferences and larger sizes. The existing fibre optic infrastructures are not widely used by OSNs, due to the lack of appropriate multiplexing techniques. Aiming at addressing the implementation issues of optical sensors in urban areas, this study proposes an efficient and cost-effective system for supporting the vibration sensing of unequally distributed points. The proposed system takes the advantages of spectral amplitude encoding optical code division multiple access (SAC-OCDMA) technique, in providing differentiated services in the physical layer with varying code weights. This system utilises more wavelengths (i.e. higher power) to the farthest sensing points in order to retrieve vibration signals, properly. The mechanism of SAC for OSN is elaborated using simulation results including the impact of transmission distance and the procedure of allocating codes to different zones. These results indicate the suitability of the proposed system to be implemented in existing fibre optic infrastructures. Moreover, the numerical analysis shows a high capacity of the sensor network deploying SAC. The proposed system contributes to the construction research and practice by addressing the implementation issues of structural health monitoring of large-scale facilities in urban areas.

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