Bragg Gratings in Optical Fibers: Fundamentals and Applications

Othonos, Andreas

doi:10.1007/978-1-4757-6079-8_2

Cited by 110 publications

(33 citation statements)

References 167 publications

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“…Fiber Bragg gratings (FBGs) are used extensively in the telecommunications industry [11], [12]. An FBG behaves like a spectral filter which has inherent characteristics that render it very sensitive to strain and temperature.…”

Section: Introductionmentioning

confidence: 99%

Polymer-coated fiber Bragg grating for relative humidity sensing

et al. 2005

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A fiber-optic-based humidity sensor has been fabricated using a fiber Bragg grating (FBG) coated with a moisturesensitive polymer. The sensing concept exploits the inherent characteristics of the FBG and is based on the strain effect induced in the Bragg grating through the swelling of the polymer coating. A direct indication of the humidity level is given by the shift of the Bragg wavelength caused by the expansion of the sensing material. The FBG sensor used in this work has an approximate coating thickness of 33 m and was exposed to different humidity levels at room temperature. The sensitivity of the sensor was estimated to be about 4.5 pm/%RH at a wavelength of 1535 nm, this being obtained through a process of linear regression. The resulting uncertainty in the measurement is 4%RH and the response time of the sensor and the moisture expansion coefficient of polyimide were obtained from a series of experimental investigations and cross compared with the results of previous work.

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Section: Introductionmentioning

confidence: 99%

Polymer-coated fiber Bragg grating for relative humidity sensing

et al. 2005

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“…The pulses are generated to specific characteristics by an optical spectrum analyser. Once a pulse has propagated through optic fiber, it is a fed into an interrogator or optical spectrum analyser (Othonos, 2000). The pulse is then analysed by the device, to determine any attenuation or change in wavelength (which may have resulted from scattering during the pulse's propagation).…”

Section: Principles Of Fiber Optic Sensingmentioning

confidence: 99%

“…The photosensitivity of optical fibers allows for the formation of phase structures within its' core, called gratings (Othonos, 2000). The operational principles of fiber Bragg gratings (FBGs) is based on the presence of these gratings within the optical fiber which are created as a series of density alterations positioned periodically along the optical fiber glass core (Iten, 2011).…”

Section: Fiber Bragg Gratings (Fbgs)mentioning

confidence: 99%

Sinkhole collapse propagation studies through instrumented small-scale physical models

Ferentinou

2020

Proc. IAHS

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Abstract. Sinkholes are common geohazards, frequently responsible for sudden catastrophic ground collapse. Thus, effective monitoring would allow for further understanding of the mechanism of occurrence of sinkholes and lead to the development of a potential early warning system to provide an alarm or a warning of incipient col-lapse. In the current study, fiber Bragg gratings (FBGs) were used to instrument reduced scale models, simulating a sinkhole event. The tests were conducted by embedding optic fiber sensors in the soil and inducing failure until critical conditions were reached. FBG sensors were manufactured in a single optic fiber cable. The measurements of small horizontal strains were recorded simultaneously and in various positions. Failure mechanism was found to relate to the backfill density, and compaction.

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“…The damage probability of each node is determined according to the arrangement characteristics of fiber grating sensor network [12]. For the FBG, the grating area may be failure due to the high temperature, but there will not be fracture failure after encapsulation.…”

Section: Optical Fbg Sensor Network Reliability Research Based On Thementioning

confidence: 99%

Fiber Bragg grating sensor network optimization

Wang

Zeng

Mu³

et al. 2015

Photonic Sens

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This study introduces the optimization of the fiber Bragg grating (FBG) network and the load identification. Current researches on the optimal placement and reliability of the FBG network and the static load identification are generally analyzed. And then, the optimal placement of sensors and reliability of the FBG network are studied. Through the analysis of structural response characteristics, the general rules of sensors placement in structural static response parameters monitoring are proposed. The probability calculation is introduced, and the numerical analyses of the FBG sensor network reliability of several simple topologies are given.

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Bragg Gratings in Optical Fibers: Fundamentals and Applications

Cited by 110 publications

References 167 publications

Polymer-coated fiber Bragg grating for relative humidity sensing

Polymer-coated fiber Bragg grating for relative humidity sensing

Sinkhole collapse propagation studies through instrumented small-scale physical models

Fiber Bragg grating sensor network optimization

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