Investigation on Time-to-Peak Feature Insensitive to Liftoff Effect for Pulsed Eddy Current Evaluation

Yang, Panpan; Fan, Mengbao; Cao, Binghua; Gao, Shang

doi:10.1109/tim.2019.2954011

Cited by 12 publications

(4 citation statements)

References 27 publications

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“…A potential method to compensate the temperature, the materials effects of solid iron rod and eccentricity changing could be multi-frequency sensor technique and pulsed eddy current method [22]- [23], which will be investigated in the future works. The iron rod temperature changes electrical conductivity and magnetic permeability, which affect reluctance of magnetic flux path and magnetic flux penetration depth, hs (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…The developed analytical method despite its simplicity has almost same accuracy as 2D FEM because the effects of finite length of the iron rod is negligible at frequencies above 400 Hz even with high relative magnetic permeability about 400-500. Analytical methods are always preferable to numerical calculations [26] if its accuracy is in satisfactory range [23].…”

Section: Discussionmentioning

confidence: 99%

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A Novel Position Sensor With a Conical Iron Core

Mirzaei

Ripka

Grim

2020

IEEE Trans. Instrum. Meas.

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A novel position sensor is presented in this paper for pneumatic and hydraulic cylinders applications. Solid iron core with conical shape surrounded by axisymmetric coils is an essential part of the proposed position sensor. Axisymmetric coils are used for e xcitation and voltage measurements. Annealing of conical solid iron core is also performed to homogenize magnetic properties and increase conical solid iron core permeability, which improve s position sensor performance in terms of sensitivity and linearity. Analytical and finite element analyses are utilized along with measurements in order to analyze the performance of position sensor. The me asurements of position sensors are performed for excitation coil inductance and pick up coils voltages. Different frequencies are considered for the analysis and measurements. The measurement results show the maximum linearity error is about 4% for the manufactured model and it is calculated maximum 1% for theoretical model.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

A Novel Position Sensor With a Conical Iron Core

Mirzaei

Ripka

Grim

2020

IEEE Trans. Instrum. Meas.

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“…[5] The intensity of the secondary magnetic field that decays with time affects the numerical change of the loop current in the receiving device, so the process of the secondary magnetic field decaying can be reflected by the voltage dynamics in the receiving loop. [6] By extracting and analyzing the response voltage signal, the corrosion damage of pipeline to be inspected can be determined. The working principle of the transient electromagnetic method to detect the pipeline with the coating layer is shown in Figure 1.…”

Section: Test Methods For Corrosion Under Insulationmentioning

confidence: 99%

Research on corrosion detection method of pipeline under thermal insulation with heat trace wire

Dang,

Jiang,

Yang

2024

Eighth International Conference on Energy System, Electricity, and Power (ESEP 2023)

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In the process of transporting crude oil, especially heavy oil, in submarine pipelines, hydrate formation, wax precipitation and viscosity increase often occur due to the decrease of temperature, which directly affects oil and gas transportation and may seriously lead to pipeline blockage and production of oil and gas fields. In order to maintain the temperature in the pipeline during production operation and shutdown, it is usually necessary to take insulation measures for the submarine pipeline. However, during the operation of the equipment, corrosion under the thermal insulation layer often occurs, and even leakage accidents may occur in serious cases, seriously threatening the safe and stable operation of the device. Therefore, we use the transient electromagnetic method to detect the corrosion of the pipeline under the thermal insulation layer. However, pipeline insulation is usually heated by an electric tracing system to maintain the temperature of the pipeline surface. Since the tracing core is made of metal material, the electric tracing system always exists in the detection process, which will affect the detection signal of pulsed eddy current pipeline and affect the detection performance of the detection system for pipeline corrosion detection under the thermal insulation layer. In order to solve this problem, a method of pipeline corrosion detection under thermal insulation with trace wire is proposed in this paper. By establishing the corrosion detection model of the pipeline under the insulation layer with heat trace wire, the influence of trace wire on the detection system is compared and analyzed, and the winding direction and winding position of trace wire can be clearly identified, which provides a basis for further analysis of the pipeline situation.

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“…Xu et al [9] found that the time to peak feature is independent of lift-off distance and has good robustness. Yang et al [10] theoretically discovered the physics of the time to peak feature. The number of unknown variables that can be resolved is proportional to the number of uncorrelated features.…”

Section: Introductionmentioning

confidence: 99%

Defect Classification Using Postpeak Value for Pulsed Eddy-Current Technique

Yang

Wang

et al. 2020

Sensors

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In this paper, a feature termed as the postpeak value is proposed for the pulsed eddy current technique (PECT). Moreover, a method using the postpeak value is proposed to classify surface and reverse defects. A PECT system is built for verification purposes. Experiment results prove that the postpeak feature value has better performance than that of the traditional peak value in the case of reverse defect detection. In contrast, the peak value is better than the postpeak value in the case of surface defect detection. Experiment results also validate that the proposed classification algorithm has advantages: classification can be achieved in real time, the calculation process and results are easy to understand, and supervised training is unnecessary.

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Investigation on Time-to-Peak Feature Insensitive to Liftoff Effect for Pulsed Eddy Current Evaluation

Cited by 12 publications

References 27 publications

A Novel Position Sensor With a Conical Iron Core

A Novel Position Sensor With a Conical Iron Core

Research on corrosion detection method of pipeline under thermal insulation with heat trace wire

Defect Classification Using Postpeak Value for Pulsed Eddy-Current Technique

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