Fiber bragg grating strain measurements in comparison with additional techniques for rock mechanical testing

Schmidt‐Hattenberger, Cornelia; Naumann, Marcel; Borm, G.

doi:10.1109/jsen.2003.809025

Cited by 29 publications

(14 citation statements)

References 9 publications

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“…Existing packaging methods include gluing FBG to the target and embedding with adhesives [22,23,24,25,26], packaging FBG in pipes or on plates [25,27,28,29,30], or encapsulating FBG into composites or layered structures [20,31,32,33,34]. For field geohazard monitoring, the installation works can be extremely tricky since the optical fibers can hardly be adhered on geomaterials.…”

Section: Development Of Fbg-based Geohazard Monitoring Systemsmentioning

confidence: 99%

FBG-Based Monitoring of Geohazards: Current Status and Trends

Zhu

Shi

Zhang

2017

Sensors

125

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In recent years, natural and anthropogenic geohazards have occured frequently all over the world, and field monitoring is becoming an increasingly important task to mitigate these risks. However, conventional geotechnical instrumentations for monitoring geohazards have a number of weaknesses, such as low accuracy, poor durability, and high sensitivity to environmental interferences. In this aspect, fiber Bragg grating (FBG), as a popular fiber optic sensing technology, has gained an explosive amount of attention. Based on this technology, quasi-distributed sensing systems have been established to perform real-time monitoring and early warning of landslides, debris flows, land subsidence, earth fissures and so on. In this paper, the recent research and development activities of applying FBG systems to monitor different types of geohazards, especially those triggered by human activities, are critically reviewed. The working principles of newly developed FBG sensors are briefly introduced, and their features are summarized. This is followed by a discussion of recent case studies and lessons learned, and some critical problems associated with field implementation of FBG-based monitoring systems. Finally the challenges and future trends in this research area are presented.

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Section: Development Of Fbg-based Geohazard Monitoring Systemsmentioning

confidence: 99%

FBG-Based Monitoring of Geohazards: Current Status and Trends

Zhu

Shi

Zhang

2017

Sensors

125

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Section: Introductionmentioning

confidence: 99%

“…Geotechnical engineering needs reliable and precise information on stress, strain, and temperature in their states, rates, and gradients both in-situ and under laboratory conditions [1]. To date, however, there are only a few cases where FBG strain sensors have been used for rock deformation [1,2]. Other applications ofFBG sensors in geotechnical engineering include dynamic monitoring oftunnel displacements [3], and in downhole measurements [4].…”

Section: Introductionmentioning

confidence: 99%

Packaging and testing of fiber Bragg gratings for use as strain sensor in rock specimens

2013

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This paper reports a packaging and calibration procedure for surface mounting of fiber Bragg grating (FBG) sensors to measure strain in rocks. The packaging of FBG sensors is performed with glass fiber and polyester resin, and then subjected to tensile loads in order to obtain strength and deformability parameters, necessaries to assess the mechanical performance of the sensor packaging. For a specific package, an optimal curing condition has been found, showing good repeatability and adaptability for non-planar surfaces, such as occurs in rock engineering.The successfully packaged sensors and electrical strain gages were attached to standard rock specimens of gabbro. Longitudinal and transversal strains under compression loads were measured with both techniques, showing that response of FBG sensors is linear and reliable. An analytical model is used to characterize the influences of rock substrate and FBG packaging in strain transmission. As a result, we obtained a sensor packaging for non-planar and complex natural material under acceptable sensitivity suitable for very small strains as occurs in hard rocks.

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“…The fiber optic sensors has shown many advantage over the traditional strain sensors, such as free from electromagnetic interferences, avoiding undesirable noise, having low signal transmission loss allowing a remote monitoring and long-term stability, small size which makes it easy to be embedded in the structure, excellent multiplexing ability which make large scale monitoring possible and reduces the price potentially at the same time, free from corrosion and so on. The fiber optic sensors system [2][3][4][5] based on FBG may be one of the best chose because of its stability, high sensitivity and excellent multiplexing ability.…”

Section: Introductionmentioning

confidence: 99%

Monitoring the Como Railway Bridge based on dynamic FBG sensor system

Zhang

Sun

Peng³

et al. 2007

SPIE Proceedings

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A FBG-based dynamic strain sensor system, whose responding frequency and resolution can be high as 16Hz and ~1µε respectively, is described and the system is applied to monitor the dynamic strain of Como Railway Bridge in Australia.The results of one-month long measurement show that the system can figure out all dynamic strain caused by passed trains and also prove the stability of the sensor system.

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Fiber bragg grating strain measurements in comparison with additional techniques for rock mechanical testing

Cited by 29 publications

References 9 publications

FBG-Based Monitoring of Geohazards: Current Status and Trends

FBG-Based Monitoring of Geohazards: Current Status and Trends

Packaging and testing of fiber Bragg gratings for use as strain sensor in rock specimens

Monitoring the Como Railway Bridge based on dynamic FBG sensor system

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