Detection of corrosion under insulation on aerospace structures via pulsed eddy current thermography

Hernandez, Johnathan; Fouliard, Quentin; Vo, Khanh; Raghavan, Seetha

doi:10.1016/j.ast.2021.107317

Cited by 25 publications

(10 citation statements)

References 39 publications

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“…Therefore, a discrete Fourier transform is needed to decompose the signal into different frequency components. In this paper, the temperature response of each pixel is calculated according to the following one-dimensional discrete Fourier transform formula [ 20 ]:

where

is the sampling interval,

designates the frequency increment,

is the number of samples,

and

are, respectively, the real and imaginary components of

. Then, the amplitude and phase can be calculated by the following equation [ 20 ]:

…”

Section: Methodologiesmentioning

confidence: 99%

Comparison Research on Characterization and Evaluation Approaches for Paint Coated Corrosion Using Eddy Current Pulsed Thermography

Xue

Zhang

Ding

et al. 2023

Sensors

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Paint coated corrosion detection and evaluation is a big challenge for steel performance and structure health. Eddy current pulsed thermography (ECPT) technique is investigated because it can reflect the corrosion physical properties through paint coating by the infrared signal. This paper proposes skewness method, which presents the feature of temperature curve’s shape automatically, and compares it with principal component analysis (PCA), phase analysis, and kurtosis feature extraction methods for paint coated corrosion characterization and evaluation. The averaged skewness shows the best sensitivity for 0–6 months corrosion. The normalized second principal component (PC) presents good sensitivity and the best measurement scale for corroded time. Furthermore, the temperature curve analysis proves that the electrical conductivity dominates the induced heating and heat distribution. The corrosion height is utilized to explain why ECPT technique is valid within 10 months corroded time. ECPT technique is proved as a smart sensor system for paint coated corrosion detection and characterization.

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where

is the sampling interval,

designates the frequency increment,

is the number of samples,

and

are, respectively, the real and imaginary components of

. Then, the amplitude and phase can be calculated by the following equation [ 20 ]:

…”

Section: Methodologiesmentioning

confidence: 99%

Comparison Research on Characterization and Evaluation Approaches for Paint Coated Corrosion Using Eddy Current Pulsed Thermography

Xue

Zhang

Ding

et al. 2023

Sensors

View full text Add to dashboard Cite

show abstract

“…This is because CUI can result in sudden and hazardous leaks, as well as plant shutdowns with a significant decrease in production volumes [1][2][3][4]. Several techniques have been developed for detecting various defects in pipelines, such as the visual method [5], radiography [6], ultrasonic guided waves [7,8], microwaves [9,10], and eddy current testing [11][12][13][14]. Among them, pulsed eddy current (PEC) testing [13,14], a different form of the eddy current-based technique, is well-known and widely accepted for its noncontact characteristic and potentially large lift-off distance.…”

Section: Introductionmentioning

confidence: 99%

Circular-arc array for the pulsed eddy current inspection of thermally insulated pipelines

Yang,

Dang,

Yang

et al. 2023

Meas. Sci. Technol.

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The inspection of corrosion under insulation (CUI) has been identified as a significant challenge in the petroleum and chemical process industries. As some of the most effective strategies, pulsed eddy current (PEC) techniques have proved effective for the measurement of the CUI of pipelines. In this paper, we propose a circular-arc array (CAA) to improve the measurement efficiency for the PEC inspection of thermally insulated pipelines. Based on the PEC system model for inspecting the CUI of pipelines, the magnetic field distribution of the CAA with multiple excitors was investigated. It is shown that the coverage of induced magnetic field gets much larger than that of the single excitor to realize high-efficiency measurements. Moreover, a sparsely distributed receiver array is designed to further improve the signal-to-noise ratio by eliminating the waviness effect due to multiple excitors. Finally, experiments were conducted, and the results demonstrated the effectiveness of the proposed method for the inspection of thermally insulated pipelines.

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“…Sudirman et al [9] employed wavelet scattering transform for denoising pulsed eddy current signals and used Gaussian process regression models to extract features, thereby improving the detection accuracy of pulsed eddy currents. Hernandez et al [10] performed tests on aircraft paint corrosion samples using pulsed eddy current thermography. The results demonstrated the ability of this technique to identify defects ranging from 0.4 mm to 5 mm.…”

Section: Introductionmentioning

confidence: 99%

Research on pulsed eddy current technology for local corrosion defects

Han,

Wang,

Liu

2023

Ninth International Conference on Mechanical Engineering, Materials, and Automation Technology (MMEAT 2023)

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Pulsed eddy current (PEC) detection technology has been widely applied in nuclear power, petrochemical, and other fields. PEC has a high detection rate for large-area corrosion and thinning. However, since the PEC detection results mainly provide the average wall thickness of the probe's focal area, its capability to detect local corrosion defects and pitting is relatively low. In this paper, for ferromagnetic materials, we propose a method based on area weighting to subdivide the region of interest and perform imaging correction on the detection data of local defects, to make the measured values of local defect pulsed eddy current closer to the true wall thickness.

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Detection of corrosion under insulation on aerospace structures via pulsed eddy current thermography

Cited by 25 publications

References 39 publications

Comparison Research on Characterization and Evaluation Approaches for Paint Coated Corrosion Using Eddy Current Pulsed Thermography

Comparison Research on Characterization and Evaluation Approaches for Paint Coated Corrosion Using Eddy Current Pulsed Thermography

Circular-arc array for the pulsed eddy current inspection of thermally insulated pipelines

Research on pulsed eddy current technology for local corrosion defects

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