Real-Time Early Warning Strategies for Corrosion Mitigation in Harsh Environments

Coelho, L.; Santos, Paulo S. S. dos; Jorge, P. A. S.; Almeida, José

doi:10.1109/jlt.2017.2755076

Cited by 5 publications

(5 citation statements)

References 9 publications

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“…After 24 h, the corrosion shifted the grating peak wavelength and optical power values to 1537.30 nm and 20.17 dB, respectively. After 36 h, the spectra presented a residual increase in optical power of about 0.43 dB, while the wavelength decreased only 0.58 nm, which is expected [19]. A comparison of the corrosion results for the Fe-coated LPFG in terms of optical power and wavelength is presented in Figure 14.…”

Section: Resultsmentioning

confidence: 54%

“…Previous works showed the possibility of using a Fe-coated LPFG as a corrosion sensor [19,23]. Thus, as an example of use of the developed IU, the corrosion-induced spectral characteristics variations of a 20-nm thick LPFG were followed.…”

Section: Resultsmentioning

confidence: 99%

“…The thin film deposition was performed by thermal evaporation of pure metal (Goodfellow, Huntingdon, England) using an electron beam evaporator (Auto 306 from Edwards Ltd., Burgess Hill, UK). The deposition chamber was kept at around 2.6×10−6 mbar, and it is fitted with a homemade rotary system, illustrated in Reference [19], in order to produce homogeneous coatings around the cylindrical fibers. Prior to the thin film coating, a 2-nm layer of chromium was deposited to improve the adhesion between the silica fiber and Fe thin film.…”

Section: Methodsmentioning

confidence: 99%

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Low-Cost Interrogation System for Long-Period Fiber Gratings Applied to Remote Sensing

Santos

Jorge

Almeida

et al. 2019

Sensors

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We present a portable and low-cost system for interrogation of long-period fiber gratings (LPFGs) costing around a 30th of the price of a typical setup using an optical spectrum analyzer and a broadband light source. The unit is capable of performing real-time monitoring or as a stand-alone data-logger. The proposed technique uses three thermally modulated fiber-coupled laser diodes, sweeping a few nanometers around their central wavelength. The light signal is then modulated by the LPFG and its intensity is acquired by a single photo-detector. Through curve-fitting algorithms the sensor transmission spectrum is reconstructed. Testing and validation were accomplished by inducing variations in the spectral features of an LPFG through changes either in external air temperature from 22 to 425 °C or in refractive index (RI) of the surrounding medium from 1.3000 to 1.4240. A dynamic resolution between 3.5 and 1.9 °C was achieved, in temperatures from 125 to 325 °C. In RI measurements, maximum wavelength and optical power deviations of 2.75 nm and 2.86 dB, respectively, were obtained in the range from 1530 to 1570 nm. The worse RI resolution obtained was 3.47 × 10 − 3 . The interrogation platform was then applied in the detection of iron corrosion, expressing wavelength peak values within 1.12 nm from the real value in the region between 1530 and 1570 nm.

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Section: Resultsmentioning

confidence: 54%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Low-Cost Interrogation System for Long-Period Fiber Gratings Applied to Remote Sensing

Santos

Jorge

Almeida

et al. 2019

Sensors

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“…In this context, further improvements have been achieved when gratings were inscribed in etched cladding fibers [ 122 ] and/or fibers were coated with thin films [ 79 , 128 , 129 , 130 , 131 , 132 , 133 , 134 , 135 , 136 ]. L. Coelho et al at INESC TEC conducted relevant research related to the influence of metal oxide coating on arc-induced gratings and their applications as refractometric sensors [ 137 , 138 , 139 , 140 , 141 , 142 , 143 , 144 , 145 ].…”

Section: Lpfgs’ Sensitivity To Fabrication and Physical Parametersmentioning

confidence: 99%

Arc-Induced Long-Period Fiber Gratings at INESC TEC. Part II: Properties and Applications in Optical Communications and Sensing

Rego

Caldas

Иванов

2021

Sensors

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In this work, we review the most important achievements of INESC TEC related to the properties and applications of arc-induced long-period fiber gratings. The polarization dependence loss, the spectral behavior at temperatures ranging from cryogenic up to 1200 °C and under exposure to ultraviolet and gamma radiation is described. The dependence of gratings sensitivity on the fabrication parameters is discussed. Several applications in optical communications and sensing domains are referred.

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“…Chemists tend to agree that it is technically impossible to eliminate corrosion since non-precious metals are chemically unstable by nature [5][6][7]. Therefore, increased positive outcomes from corrosion mitigation actions [8][9] are contingent upon the timely detection of corrosion. However, manual inspection to detect the onset or existence of corrosion in facilities is characterized by a number of significant challenges.…”

Section: Introductionmentioning

confidence: 99%

Autoencoder-Based Representational Learning for the Determination of Corrosion Severity

Ayogu,

Ekebor,

Nwokorie

et al. 2023

IJEEI

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Automatic determination of corrosion severity is an important task that has not received adequate study due to the non-availability of datasets. This study explores corrosion severity detection by leveraging representation learning for the development of lightweight, shallow machine learning models. A variational autoencoder was used for feature extraction. Four classifiers, specifically RF, SVC, k-NN, and XGBoost, were trained using the encoded representation without any additional processing. Voting classifiers were also constructed using the trained models. Except for the slight drop in precision (6.06%) of the soft voting classifier, augmentation produces a general positive influence on the precision, recall, and F1-score of the models understudied; it improved the precision, recall, and F1-metrics of K-NN and hard-voting classifiers most remarkably. For K-NN, the improvement reached 29.17%, 20.93%, and 30.77% for precision, recall, and F1-metrics, respectively, and 30.36%, 26.42%, and 35.29%, respectively, for the hard voting classifier. Whereas our experiments could not produce stateof-the art results, it provides adequate motivation to further study VAE as a data preprocessing unit for the development of simple, efficient, lightweight models that can be deployed on resource constrained devices, which will in turn advance the development and deployment of corrosion monitoring systems on low-cost devices.

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Real-Time Early Warning Strategies for Corrosion Mitigation in Harsh Environments

Cited by 5 publications

References 9 publications

Low-Cost Interrogation System for Long-Period Fiber Gratings Applied to Remote Sensing

Low-Cost Interrogation System for Long-Period Fiber Gratings Applied to Remote Sensing

Arc-Induced Long-Period Fiber Gratings at INESC TEC. Part II: Properties and Applications in Optical Communications and Sensing

Autoencoder-Based Representational Learning for the Determination of Corrosion Severity

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