Eddy current testing of conductive discs using the pot-core sensor

Tytko, Grzegorz; Dziczkowski, Leszek; Magnuski, Mirosław; Zhang, Zhijie; Luo, Yao

doi:10.1016/j.sna.2022.114060

Cited by 5 publications

(3 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…So far, the pot-core sensor has been used for testing discs [ 39 , 40 ] and plates [ 41 , 42 , 43 , 44 ] with a thickness much greater than conductive foils or typical layered structures ( Figure 1 ). This work is the first time that an eddy current system containing a pot-core sensor and an analytical model for testing thin layers and coatings with a thickness of 0.1 mm has been used.…”

Section: Introductionmentioning

confidence: 99%

Eddy Current Testing of Conductive Coatings Using a Pot-Core Sensor

Tytko

2023

Sensors

Self Cite

View full text Add to dashboard Cite

Conductors consisting of thin layers are commonly used in many industries as protective, insulating or thermal barrier coatings (TBC). Nondestructive testing of these types of structures allows one to determine their dimensions and technical condition, while also detecting defects, which significantly reduces the risk of failures and accidents. This work presents an eddy current system for testing thin layers and coatings, which has never been presented before. It consists of an analytical model and a pot-core sensor. The analytical model was derived through the employment of the truncated region eigenfunction expansion (TREE) method. The final formulas for the sensor impedance have been presented in a closed form and implemented in Matlab. The results of the calculations of the pot-core sensor impedance for thin layers with a thickness above 0.1 mm were compared with the measurement results. The calculations made for the TBC were verified with a numerical model created using the finite element method (FEM) in Comsol Multiphysics. In all the cases, the error in determining changes in the components of the pot-core sensor impedance was less than 4%. At the same time, it was shown that the sensitivity of the applied pot-core sensor in the case of thin-layer testing is much higher than the sensitivity of the air-core sensor and the I-core sensor.

show abstract

Section: Introductionmentioning

confidence: 99%

Eddy Current Testing of Conductive Coatings Using a Pot-Core Sensor

Tytko

2023

Sensors

Self Cite

View full text Add to dashboard Cite

show abstract

“…Nondestructive Testing is a process that examines the physical characteristics, chemical parameters, defect location, and other information of the tested object without compromising its structure or performance. Currently, the most common non-destructive testing techniques used in material diagnosis are UltrasonicTesting, Magnetic Powder testing, Eddy Current Testing, and other conventional testing methods [4][5][6] , among which industrial CT testing technology has many advantages over traditional non-destructive testing techniques. With the development of micro-CT technology in recent years, image resolution has successfully reached the micro level, enabling the microstructure analysis of composite materials.…”

Section: Introductionmentioning

confidence: 99%

Investigation on pore characteristics of carbon fiber composite using micro-CT

Chi¹,

Han²,

Miao³

et al. 2023

International Conference on Optoelectronic Materials and Devices (ICOMD 2022)

View full text Add to dashboard Cite

Carbon fiber reinforced resin matrix composite (CFRP) has been widely used in aerospace, military and other fields because of its low density and high strength. In composite components, the reliability of materials is significantly impacted by flaws like bubbles. The microscopic CT (computed tomography) technique is suitable for identifying material flaws. This paper takes CFRP as an example to study the pore structure characteristics. The porosity of the sample is 18.66%. Three distinct areas of the carbon fiber were chosen simultaneously, It makes up 98.58% of the pore size in the ROI (regions of interest)-1 area when the pore diameter is between 200μm and 400μm. When the pore size is 41.98-131μm, 98.58% of the total pore size is represented. The inner pore diameter of ROI-3 is 41.98-52.90μm, and there are 31,023 pores in total, which is 42.35% of all pores. The fractal dimensions of cuboid pore models in three distinct regions are centered in the ranges 1. 62-1.68, 1.52-1.55, and 1.35-1.38, respectively. This suggests that a significant portion of the pores at the microscale or even smaller scale are determined by the number of pores and that the filling capacity of pores varies, which is extremely important for the subsequent cross-scale seepage behavior and seepage law of composite materials.

show abstract

“…It is well known that the pot magnetic core has a higher efficiency because of less magnetic leakage compared with other types of magnetic cores [16]. Hence, this paper proposes a pot-core eddy current sensor based on DC magnetization to sense the permeability perturbation caused by internal defects.…”

Section: Introductionmentioning

confidence: 99%

A pot-core eddy current sensor based on DC magnetization

Ou,

Dong,

et al. 2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

Due to the limitation of the skin effect of traditional eddy current sensors, it is difficult to sense internal defects. This paper proposes a pot-core eddy current sensor based on DC magnetization, which uses DC magnetization to excite the permeability perturbation of internal defects in the surface of samples and uses a pot-core eddy current sensor with higher efficiency to sense the perturbation, thus realizing the detection of defects. The phenomenon of permeability perturbation is analyzed by simulation, and experiments are conducted to verify the performance of the sensor. Also, the effects of magnetizing current and defect size are investigated experimentally. The results show that the sensor can realize the detection of the small internal defect with an unsaturated magnetizing current.

show abstract

Eddy current testing of conductive discs using the pot-core sensor

Cited by 5 publications

References 10 publications

Eddy Current Testing of Conductive Coatings Using a Pot-Core Sensor

Eddy Current Testing of Conductive Coatings Using a Pot-Core Sensor

Investigation on pore characteristics of carbon fiber composite using micro-CT

A pot-core eddy current sensor based on DC magnetization

Contact Info

Product

Resources

About