Adjusting LOI for Enhancement of Pulsed Eddy Current Thickness Measurement

Wen, Dongdong; Fan, Mengbao; Cao, Binghua; Ye, Bo

doi:10.1109/tim.2019.2904331

Cited by 29 publications

(4 citation statements)

References 26 publications

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“…In the current research, the common electromagnetic nondestructive evaluation methods for defect size evaluation include eddy current testing (ECT) [ 4 , 5 , 6 , 7 ], pulsed eddy current testing (PECT) [ 8 , 9 , 10 , 11 , 12 ], and magnetic flux leakage (MFL) testing [ 13 , 14 , 15 ], alternating current field measurement (ACFM) [ 16 , 17 , 18 ]. MFL [ 19 , 20 , 21 , 22 , 23 ] was limited by wall thickness, while the signal for evaluating defects in thick-walled components is attenuated with increasing wall thickness, and some of them [ 24 , 25 , 26 , 27 , 28 , 29 , 30 ] were often affected by skin effects or magnetic shielding effects.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Depth Size Based on Layered Magnetization by Double-Sided Scanning for Internal Defects

Deng,

Qian,

Hong

et al. 2024

Sensors

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The quantitative evaluation of defects is extremely important, as it can avoid harm caused by underevaluation or losses caused by overestimation, especially for internal defects. The magnetic permeability perturbation testing (MPPT) method performs well for thick-walled steel pipes, but the burial depth of the defect is difficult to access directly from a single time-domain signal, which is not conducive to the evaluation of defects. In this paper, the phenomenon of layering of magnetization that occurs in ferromagnetic materials under an unsaturated magnetizing field is described. Different magnetization depths are achieved by applying step magnetization. The relationship curves between the magnetization characteristic currents and the magnetization depths are established by finite element simulations. The spatial properties of each layering can be detected by different magnetization layering. The upper and back boundaries of the defect are then localized by a double-sided scan to finally arrive at the depth size of the defect. Defects with depth size of 2 mm are evaluated experimentally. The maximum relative error is 5%.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Depth Size Based on Layered Magnetization by Double-Sided Scanning for Internal Defects

Deng,

Qian,

Hong

et al. 2024

Sensors

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“…At present, various NDT methods are applied to the nonferromagnetic pipe crack inspection, which mainly include the penetrant testing (PT) [5], the radiographic testing (RT) [6], the ultrasonic testing (UT) [7,8], and the eddy current testing (ET) [9]. PT are the most commonly used NDT methods because of their simple principles and low requirements for operation, but they require thorough cleaning of the pipe surface [10].…”

Section: Introductionmentioning

confidence: 99%

Rotating alternating current field measurement testing system with TMR arrays for arbitrary-angle crack on nonferromagnetic pipes

Zhao¹,

Li²,

Yuan³

et al. 2022

Meas. Sci. Technol.

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Nonferromagnetic pipes are widely used in power plants such as fluid transportation and heat exchanger devices. Due to the severe environments, including corrosion, high temperature, etc., it is subject to surface arbitrary-angle cracks. In view of this background, this paper proposed a rotating alternating current field measurement (RACFM) testing system for arbitrary-angle cracks in nonferromagnetic pipes. The RACFM pipe detection model is established and the unidirectional excitation coil and the orthogonal excitation coil are simulated separately. The testing system and the probe with tunnel magneto resistance (TMR) sensor arrays and flexible orthogonal excitation coils are built to detect cracks at different angles in the pipe. The simulation and experimental results reveal that the RACFM detection system has high sensitivity for arbitrary-angle cracks in the outer surface of the pipe, and it can effectively measure the lengths and angles of the cracks.

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“…In eddy-current testing, the air-cored coil (Fig. 1) is commonly used for the measurement of: material thickness [1][2][3], magnetic permeability [4][5][6], electrical conductivity [7,8], calculations of magnetic field [9,10], or in a fuzzy logic approach [11][12][13][14]. In mathematical models, the geometric dimensions of the air-cored coil are usually determined by the means of four parameters: inner radius r 1 , outer radius r 2 , lower height h 1 , and upper height h 2 (Fig.…”

Section: Introductionmentioning

confidence: 99%

Fast Method of Calculating the Air-Cored Coil Impedance Using the Filamentary Coil Model

Tytko¹

2020

PIER M

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This paper presents a method for calculating the air-cored coil impedance with the employment of a mathematical model of an ideal filamentary coil. The proposed algorithm enables assigning, in a very quick way, each cylindrical air-cored coil to the corresponding filamentary coil using only two equivalent parameters. The first of them is the radius of the coil, whereas the second one is the distance between the coil and the surface of the tested material. The changes both in the parameters of the system under consideration and in the tested material bring about the same change in the impedance of the air-cored coil and the corresponding filamentary coil. This property brings a lot of advantages, since it allows using simpler final formulas for the filamentary coil and performing the calculations in a much shorter time, while obtaining the same results as in the case of the air-cored coil. At the same time, the creation of the scale of the measuring instrument and its calibration becomes far simpler since it is based on only two equivalent parameters.

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Adjusting LOI for Enhancement of Pulsed Eddy Current Thickness Measurement

Cited by 29 publications

References 26 publications

Evaluation of Depth Size Based on Layered Magnetization by Double-Sided Scanning for Internal Defects

Evaluation of Depth Size Based on Layered Magnetization by Double-Sided Scanning for Internal Defects

Rotating alternating current field measurement testing system with TMR arrays for arbitrary-angle crack on nonferromagnetic pipes

Fast Method of Calculating the Air-Cored Coil Impedance Using the Filamentary Coil Model

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