Application of optical sensing technology to the civil engineering field with optical fiber strain measurement device (BOTDR)

Komatsu, K.; Fujihashi, Kazuhiko; Okutsu, Masaru

doi:10.1117/12.481994

Cited by 24 publications

(8 citation statements)

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“…Brillouin Optical Time Domain Reflactometer (BOTDR) based distributed FOS are generally used for monitoring purpose. Komatsu et al 20 discussed the measurement principle of the strain measurement method using optical fibers (BOTDR method). Case studies of application to the deformation of telecommunications tunnels, ground subject to landslides and so on, and also an outline of an automatic measuring system were presented.…”

Section: Sensors For Structural Health Monitoring (Shm) Of Undergrounmentioning

confidence: 99%

Stability and reliability of fiber optic measurement systems: basic conditions for successful long term structural health monitoring

2011

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Recent developments in fiber optic sensors for monitoring civil structures have been of great help for engineers dealing with these structures. After literature survey it is observed that while using fiber optic sensor system for health monitoring of civil structures not much attention is given to the core quality of the fiber, types of coating on fiber, implementing methodologies, handling of fiber optic sensors and their long term effect on reliability of the performance of the monitoring system. These issues are important because the structural conditions, stress level and environment in which fiber optic sensors are placed are different from telecommunication industry. In this paper issues related to long term structural health monitoring of civil structures are investigated. The issue of the fatigue property of optic fiber is discussed since reversal bending of the fiber may cause adverse effect on the light carrying capacity of the fiber. Other long term structural health monitoring (SHM) issues such as life of fiber, strain transfer process from fiber core to coating, calibration of fiber and selection of fiber are also discussed based on the experiments carried out for successful implementation of long term health monitoring of civil structures. The main objective of these experiments is to come up with comprehensive long term structural health monitoring system for strain measurement.

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Section: Sensors For Structural Health Monitoring (Shm) Of Undergrounmentioning

confidence: 99%

Stability and reliability of fiber optic measurement systems: basic conditions for successful long term structural health monitoring

2011

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“…Among the SHM techniques, the distributed fiber optic sensing technique is considered most efficient due to its high accuracy, distributed sensing, high resistance to electromagnetic field and long-term stability, such as Brillouin Optical Time Domain Analysis (BOTDA), Brillouin Optical Time Domain Reflectometer (BOTDR), Fiber Bragg Grating (FBG) and so on [4,5] . However, the optical fiber is so fragile that it needs special protection.…”

Section: Introductionmentioning

confidence: 99%

Application of smart BFRP bars with distributed fiber optic sensors into concrete structures

Tang

Yang

et al. 2010

Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2010

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In this paper, the self-sensing and mechanical properties of concrete structures strengthened with a novel type of smart basalt fiber reinforced polymer (BFRP) bars were experimentally studied, wherein the sensing element is Brillouin scattering-based distributed optical fiber sensing technique. First, one of the smart bars was applied to strengthen a 2m concrete beam under a 4-points static loading manner in the laboratory. During the experiment, the bar can measure the inner strain changes and monitor the randomly distributed cracks well. With the distributed strain information along the bar, the distributed deformation of the beam can be calculated, and the structural health can be monitored and evaluated as well. Then, two smart bars with a length of about 70m were embedded into a concrete airfield pavement reinforced by long BFRP bars. In the field test, all the optical fiber sensors in the smart bars survived the whole concrete casting process and worked well. From the measured data, the concrete cracks along the pavement length can be easily monitored. The experimental results also confirmed that the bars can strengthen the structures especially after the yielding of steel bars. All the results confirm that this new type of smart BFRP bars show not only good sensing performance but also mechanical performance in the concrete structures.

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“…Brillouin scattering based distributed fiber optic sensor systems are powerful diagnostic and monitoring tools which can be used to measure strain or temperature [1,2]. They can measure strain or temperature at all points along the sensing fiber and may be tens of kilometers long [3,4].…”

Section: Introductionmentioning

confidence: 99%

Optical fiber characterization for optimization of a Brillouin-scattering-based fiber optic sensor

Brown

Colpitts

2004

SPIE Proceedings

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Brillouin scattering-based distributed fiber optic sensors have been shown to be effective diagnostic tools for monitoring structural health and detecting fires and hot spots, among other uses. Current research has mainly been focused on improving the spatial, strain and temperature resolutions, and sensing lengths of these systems, generally by the use of better signal processing and improved equipment. In contrast, there has been little published work on optimizing the sensing optical fiber itself. A number of commercially available optical fibers have been measured in order to determine how to optimize their Brillouin characteristics. Some characteristics chosen are the number of Brillouin peaks, the frequency of the peaks, their linewidth, and the temperature and strain coefficients of each peak. It is shown that lowering the intrinsic Brillouin frequency of the fiber can increase the Brillouin strain coefficient and decrease the temperature coefficient of the optical fiber for the main Brillouin peak, among other results.

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Application of optical sensing technology to the civil engineering field with optical fiber strain measurement device (BOTDR)

Cited by 24 publications

References 0 publications

Stability and reliability of fiber optic measurement systems: basic conditions for successful long term structural health monitoring

Stability and reliability of fiber optic measurement systems: basic conditions for successful long term structural health monitoring

Application of smart BFRP bars with distributed fiber optic sensors into concrete structures

Optical fiber characterization for optimization of a Brillouin-scattering-based fiber optic sensor

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