Journal ArticleDOI
Fiber-optic Bragg grating sensors for bridge monitoring
TLDR
Fiber-optic Bragg grating strain sensors hold a great deal of potential for structural monitoring because of their exceptional stability and demonstrated potential for long-term monitoring as discussed by the authors, which results in measurement stability and lead/interconnect insensitivity which permit longterm and intermittent monitoring with high resolution and accuracy.Abstract:
Fiber-optic Bragg grating strain sensors hold a great deal of potential for structural monitoring because of their exceptional stability and demonstrated potential for long-term monitoring. This sensing technology takes advantage of a spectrally encoded signal which provides inherent immunity from signal intensity fluctuations which plague many other fiber-optic and electronic sensing techniques. This results in measurement stability and lead/interconnect insensitivity which permit longterm and intermittent monitoring with high resolution and accuracy. Fiber-optic grating sensors are intrinsic to the optical fiber, thus capitalizing on its extremely small size and inherent strength and durability. Recent results are provided from a sensor array installed in a road bridge. The strain sensors are attached to both steel and carbon-fiber-reinforced plastic prestressing tendons, which are embedded in the precast girders of the bridge. Measurements of traffic loads and the relaxation behaviour of the tendons are presented. The potential of fiber grating technology is briefly discussed including its application in long-gage strain-sensing and strain-distribution measurements.read more
Citations
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Journal ArticleDOI
Fibre Bragg gratings in structural health monitoring—Present status and applications
Mousumi Majumder,Tarun Kumar Gangopadhyay,Ashim Kumar Chakraborty,Kamal Dasgupta,D.K. Bhattacharya +4 more
TL;DR: The recent research and development activities in structural health monitoring using FBG sensors have been critically reviewed, highlighting the areas where further work is needed.
Journal ArticleDOI
Recent applications of fiber optic sensors to health monitoring in civil engineering
TL;DR: In this paper, the authors present an overview of current research and development in the field of structural health monitoring with civil engineering applications, including building, piles, bridges, pipelines, tunnels, and dams.
Journal ArticleDOI
Recent progress in applications of in-fibre Bragg grating sensors
TL;DR: In-fibre Bragg grating (FBG) sensor technology has become one of the most rapidly progressing sensing topics of this decade in the field of optical fiber sensors as mentioned in this paper.
Journal ArticleDOI
Development of fiber Bragg grating sensors for monitoring civil infrastructure
TL;DR: In this article, a multi-disciplinary research program on fiber bragg grating sensors involving the School of Civil and Structural Engineering at Nanyang Technological University in Singapore is reported.
Journal ArticleDOI
Detection of Transverse Cracks in CFRP Composites Using Embedded Fiber Bragg Grating Sensors
TL;DR: In this article, fiber Bragg grating (FBG) sensors were applied for the detection of transverse cracks, which cause strain distribution within the gage length, in carbon fiber reinforced plastic (CFRP) cross-ply laminates.
References
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Journal ArticleDOI
Photosensitivity in optical fiber waveguides: Application to reflection filter fabrication
TL;DR: In this paper, the observation of photosensitivity in Ge-doped core optical fibers is reported. The photosensitivity is manifested by light-induced refractive index changes in the core of the waveguide.
Journal ArticleDOI
Formation of Bragg gratings in optical fibers by a transverse holographic method
G. Meltz,W W Morey,W. H. Glenn +2 more
TL;DR: Bragg gratings have been produced in germanosilicate optical fibers by exposing the core, through the side of the cladding, to a coherent UV two-beam interference pattern with a wavelength selected to lie in the oxygen-vacancy defect band of germania, near 244 nm.
Journal ArticleDOI
Bragg gratings fabricated in monomode photosensitive optical fiber by UV exposure through a phase mask
TL;DR: In this paper, a photolithographic method is described for fabricating refractive index Bragg gratings in photosensitive optical fiber by using a special phase mask grating made of silica glass.
Book
Geotechnical Instrumentation for Monitoring Field Performance
TL;DR: In this paper, the authors provide a guide to the entire process of geotechnical instrumentation, showing where to monitor safety and performance, and what benefits can be achieved, and how construction specifications should be written.