scholarly journals Improved NEPA Substations On-Line Monitoring Technology Using Optical Fiber Sensors

2003 ◽  
Vol 2 (1) ◽  
Author(s):  
M Omidiora
Keyword(s):  
Optical Fiber ◽  
Condition Monitoring ◽  
Optical Fiber Sensors ◽  
Monitoring Method ◽  
Future Directions ◽  
Fiber Sensors ◽  
The Arts ◽  
On Line ◽  
Substation Equipment ◽  
Current Monitoring

Condition monitoring of power substations is a significant issue for the National Electric Power Authority (NEPA) of Nigeria. Current methods for monitoring the condition of high voltage equipment are time consuming and often inaccurate, therefore causing catastrophic damage to the substation equipment. Recent research has demonstrated the efficacy of employing optical fiber sensors in condition monitoring of substation equipment. These sensors enhance the current monitoring method and facilitate faster responses to equipment problems. This paper briefly reviews the state of the arts, but is primarily devoted to a discussion of the new approach and future directions in condition monitoring of NEPA substation equipment.

GROWTH MONITORING OF DELAMINATION AND ADHESIVE DEBONDING OF CFRP STRUCTURES BY RAYLEIGH SCATTING-BASED DISTRIBUTION SENSORS

2021 ◽  
Author(s):  
KAZUKI OHNISHI ◽  
TATSURO KOSAKA ◽  
GENKO FUJIOKA
Keyword(s):  
Optical Fiber ◽  
Strain Distribution ◽  
Rayleigh Scattering ◽  
Adhesive Layer ◽  
Optical Fiber Sensors ◽  
Surface Strain ◽  
Growth Monitoring ◽  
Monitoring Method ◽  
Fiber Sensors ◽  
Measured Strain

Since delamination of CFRP laminates is generated by impact or fatigue in aircraft operation, identification method of the delamination is a very important technology to ensure safety of aircraft. Recently, built-in sensors are paid attention as a real-time monitoring method of initiation and growth of delamination. Optical fiber sensors are promised as built-in sensors of FRP due to their high strength, durability and embeddability. In this paper, we applied a Rayleigh scattering-based distribution sensor to detect delamination and debonding of CFRP structures. This optical fiber sensor can measure strain distribution along a fiber with wide area range, high spatial and strain resolutions. The optical fiber sensors attached on the surface of laminates were used to detect delamination and adhesive debonding of DCB, ENF and SLJ (single lap joint) specimens. Pre-crack were formed by inserting a Teflon films between the layers or the laminate and adhesive layer during manufacturing. The experimental results of DCB tests showed that the position of delamination edge could be identified precisely from the measured sharp peak of strain distribution. From the results of ENF tests, it appeared that the strain distribution showed the maximum at the delamination edge and the detected delamination edge positions agreed very well with the observed positions. The measured strain distributions were almost same as simulated results by FEM. From the tensile test results of SLJ specimen, it appeared that strain distribution showed extremum at debonding edge. It was also shown that the measured strain distribution agreed well with simulated results by FEM. From the above results, it appeared that the open delamination and debonding could be easily identified from surface strain distribution measured by the Rayleigh scattering-based sensor.

Optical fiber sensors for coal mine shaft integrity and equipment condition monitoring

2019 ◽  
Author(s):  
Feng Zhu ◽  
Gonghua Wang ◽  
Tongyu Liu ◽  
Gang Ma ◽  
Kenneth T. V. Grattan ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Condition Monitoring ◽  
Coal Mine ◽  
Optical Fiber Sensors ◽  
Mine Shaft ◽  
Fiber Sensors

Intensity-based optical fiber sensors for condition monitoring of engineering materials

1996 ◽  
Author(s):  
Crispin T. M. Doyle ◽  
Anthony R. Martin ◽  
M. Q. Wu ◽  
Tonguy Liu ◽  
Simon A. Hayes ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Condition Monitoring ◽  
Optical Fiber Sensors ◽  
Fiber Sensors ◽  
Engineering Materials

Optical Fiber Sensors for Remote Condition Monitoring of Industrial Structures

2019 ◽  
pp. 1815-1838
Author(s):  
Tong Sun OBE ◽  
M. Fabian ◽  
Y. Chen ◽  
M. Vidakovic ◽  
S. Javdani ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Condition Monitoring ◽  
Optical Fiber Sensors ◽  
Fiber Sensors ◽  
Industrial Structures

Lensed optical fiber sensors for on-line measurement of flow

2002 ◽  
Vol 41 (1) ◽  
pp. 13-18 ◽  
Author(s):  
Sallehuddin Ibrahim ◽  
Robert Garnett Green ◽  
Ken Dutton ◽  
Ruzairi Abdul Rahim
Keyword(s):  
Optical Fiber ◽  
Optical Fiber Sensors ◽  
Fiber Sensors ◽  
Line Measurement ◽  
On Line

Development of Health Monitoring Method for Solar Array Panel using Optical Fiber Sensors

2016 ◽  
Vol 64 (1) ◽  
pp. 6-12 ◽  
Author(s):  
Kazushi SEKINE ◽  
Michihito MATSUMOTO ◽  
Hajime TAKEYA ◽  
Hiromi SEKO ◽  
Yuki KOBAYASHI ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Health Monitoring ◽  
Optical Fiber Sensors ◽  
Solar Array ◽  
Monitoring Method ◽  
Fiber Sensors

scholarly journals A Review of Recent Distributed Optical Fiber Sensors Applications for Civil Engineering Structural Health Monitoring

Sensors ◽  
2021 ◽  
Vol 21 (5) ◽  
pp. 1818
Author(s):  
Mattia Francesco Bado ◽  
Joan R. Casas
Keyword(s):  
Structural Health Monitoring ◽  
Optical Fiber ◽  
Health Monitoring ◽  
Optical Fiber Sensors ◽  
Vibration Monitoring ◽  
Fiber Sensors ◽  
Structural Health ◽  
Comprehensive Collection ◽  
Monitoring Tools ◽  
Distributed Optical Fiber

The present work is a comprehensive collection of recently published research articles on Structural Health Monitoring (SHM) campaigns performed by means of Distributed Optical Fiber Sensors (DOFS). The latter are cutting-edge strain, temperature and vibration monitoring tools with a large potential pool, namely their minimal intrusiveness, accuracy, ease of deployment and more. Its most state-of-the-art feature, though, is the ability to perform measurements with very small spatial resolutions (as small as 0.63 mm). This review article intends to introduce, inform and advise the readers on various DOFS deployment methodologies for the assessment of the residual ability of a structure to continue serving its intended purpose. By collecting in a single place these recent efforts, advancements and findings, the authors intend to contribute to the goal of collective growth towards an efficient SHM. The current work is structured in a manner that allows for the single consultation of any specific DOFS application field, i.e., laboratory experimentation, the built environment (bridges, buildings, roads, etc.), geotechnical constructions, tunnels, pipelines and wind turbines. Beforehand, a brief section was constructed around the recent progress on the study of the strain transfer mechanisms occurring in the multi-layered sensing system inherent to any DOFS deployment (different kinds of fiber claddings, coatings and bonding adhesives). Finally, a section is also dedicated to ideas and concepts for those novel DOFS applications which may very well represent the future of SHM.

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