Amplified OTDR Systems for Multipoint Corrosion Monitoring

Nascimento, Jehan Fonsêca do; Silva, Marcionilo J. da; Coêlho, Isnaldo José de Souza; Cipriano, Eliel; Martins-Filho, Joaquim F.

doi:10.3390/s120303438

Cited by 13 publications

(4 citation statements)

References 16 publications

(18 reference statements)

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“…Currently, the key FOCS methods include fiber Bragg grating, Brillouin optical time domain reflectometer/analysis, and long period fiber grating. In addition, some FOCS technologies have been applied extensively in experimental researches, such as optical time-domain reflectometer (OTDR) [80,81], Fabry–Perot interferometer [82,83], quasi-distributed sensors [84], Fe(C)-coated optical fiber sensors [85], etc. Nevertheless, there are existing problems for the wide application of all FOCS methods in practical engineering: (1) Quantitative relationship between changes in physical property and corrosion extent; (2) To avoid chemical attack, mechanical impact, or man-made interference, research on the packaging and embedding of sensors is particularly important; (3) Due to the limitation in the service life of optical fiber sensors, especially for glass fiber, the updating and replacement of techniques requires further research.…”

Section: Physical Methodsmentioning

confidence: 99%

A Recent Progress of Steel Bar Corrosion Diagnostic Techniques in RC Structures

Luo

Jun-nan

et al. 2018

Sensors

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Corrosion of steel bar is one of key factors undermining reinforced concrete (RC) structures in a harsh environment. This paper attempts to review the non-destructive procedures from the aspect of the corrosion measurement techniques, especially their advantages and limitations. Systematical classification of diagnostic methods is carried out to determine any probable corrosion issues before the structures become severe, and helps choose the suitable method according to different construction features. Furthermore, the three electrochemical factors method is introduced to inspire researchers to combine various techniques to improve corrosion evaluation accuracy. The recommendations for future work are summarized, in conclusion.

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Section: Physical Methodsmentioning

confidence: 99%

A Recent Progress of Steel Bar Corrosion Diagnostic Techniques in RC Structures

Luo

Jun-nan

et al. 2018

Sensors

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“…There are reports in the literature of the use of optical fibers with metallized cleaved facet to create the sensor region [19], [23], [24]. These sensors use the optical time domain reflectometry (OTDR) technique as the interrogation method, which provides multi-point monitoring.…”

Section: Corrosion Sensor Using Metallic Doublementioning

confidence: 99%

Corrosion Sensor Using Metallic Double Layer in Optical Fiber

Oliveira

Silva

Alves

et al. 2021

J. Microw. Optoelectron. Electromagn. Appl.

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In this paper, a new optical fiber corrosion sensor based on metallic bilayers is described. The detection region is located at a fiber end facet and we present simulations as well as experimental results in controlled lab conditions for Ti(10 nm)/Al(10 nm) and Ni(5 nm)/Al(5 nm) bilayers. We perform the characterization of the device by numerical simulations using the COMSOL Multiphysics software, and with an analytical model, which makes use of the Fresnel equations. According to the simulations, the change in the reflected optical signal over time is related to variations in the thickness of the metallic films by the corrosive process and, consequently, the corrosion rate in each metal of the bilayer can be obtained. Upon the simulation results, sensor devices were fabricated by depositing thin metallic films on the cleaved facet of the optical fiber using the sputtering method. We show that the use of a metallic bilayer as a transducer, instead of a monolayer, improves the sensor measuring interval (20 ± 1 nm) and provides information about the corrosion rate along the corrosion process.

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“…[44][45][46][47] where the authors use this simple configuration to develop OTDR multipoint sensing systems devoted to the detection of aluminum and steel degradation, respectively. [44][45][46][47] where the authors use this simple configuration to develop OTDR multipoint sensing systems devoted to the detection of aluminum and steel degradation, respectively.…”

Section: Corrosivity Direct Measurements Using Metallic Sacrificial Lmentioning

confidence: 99%