A simplified model for non-destructive thickness measurement immune to the lift-off effect

Yan-ru, WU; Cao, Zhang; Xu, Lijun

doi:10.1109/imtc.2011.5944256

Cited by 3 publications

(1 citation statement)

References 15 publications

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“…Wu et al 18 proposed an air-core coil for thickness measurement which is immune to the lift-off effect by using the phase signature of inductance change when an air-core coil is next to a plate sample. The results proved the effectiveness of the postulated technique.…”

Section: Introductionmentioning

confidence: 99%

Hybrid GMR/IR probe to reduce the effects of lift-off

Faraj

Samsuri

Abdalla

et al. 2019

Measurement and Control

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Eddy current testing technique is being utilized in engineering, such as in nuclear steam pipe, aircraft and gas/oil pipeline, due to its sensitivity to small cracks and subsurface defects, immediate results, environmental friendliness, and use in examining complex sizes and shapes of substances. However, the lift-off noise due to irregular inspected materials surface, varying coating thicknesses, or movement of transducers extremely limits the implementation of eddy current testing in a non-disastrous testing which impacts the measure of defect depth on the conductive material. In this paper, a study on hybrid giant magneto-resistance/infrared probe is proposed to minimize the influence of lift-off for detecting the depth defect. The giant magneto-resistance reads the magnetic field which reflects any defect inside the pipeline, and infrared sensors read the movement of each giant magneto-resistance inside the pipeline. The error compensation technique depends on Mamdani fuzzy which examines the interaction that exists between the peak value of giant magneto-resistance and the infrared sensor signal. The eddy current testing inspection system includes details of the giant magneto-resistance–eddy current probe design and instrumentation of the error compensation technique. The measurement method is based on alternating current supply with 30 kHz frequency to ensure that the crack signals are clearly displayed. The proposed method is verified experimentally, and the result shows that the impact of lift-off noise is highly reduced in the eddy current testing technique and enhances the sensor accuracy. The depth defect error caused by 1 mm lift-off is reduced to 7.20%.

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Section: Introductionmentioning

confidence: 99%

Hybrid GMR/IR probe to reduce the effects of lift-off

Faraj

Samsuri

Abdalla

et al. 2019

Measurement and Control

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A Novel Measurement Method of Nonferromagnetic Metal Pipe Thickness Based on the Tilt Angle Intersection

Mao

Wang

Xiao

2022

IEEE Trans. Instrum. Meas.

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Giant Magnetoresistance Sensors: A Review on Structures and Non-Destructive Eddy Current Testing Applications

Rifai

Abdalla

Ali

et al. 2016

Sensors

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Non-destructive eddy current testing (ECT) is widely used to examine structural defects in ferromagnetic pipe in the oil and gas industry. Implementation of giant magnetoresistance (GMR) sensors as magnetic field sensors to detect the changes of magnetic field continuity have increased the sensitivity of eddy current techniques in detecting the material defect profile. However, not many researchers have described in detail the structure and issues of GMR sensors and their application in eddy current techniques for nondestructive testing. This paper will describe the implementation of GMR sensors in non-destructive testing eddy current testing. The first part of this paper will describe the structure and principles of GMR sensors. The second part outlines the principles and types of eddy current testing probe that have been studied and developed by previous researchers. The influence of various parameters on the GMR measurement and a factor affecting in eddy current testing will be described in detail in the third part of this paper. Finally, this paper will discuss the limitations of coil probe and compensation techniques that researchers have applied in eddy current testing probes. A comprehensive review of previous studies on the application of GMR sensors in non-destructive eddy current testing also be given at the end of this paper.

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A simplified model for non-destructive thickness measurement immune to the lift-off effect

Cited by 3 publications

References 15 publications

Hybrid GMR/IR probe to reduce the effects of lift-off

Hybrid GMR/IR probe to reduce the effects of lift-off

A Novel Measurement Method of Nonferromagnetic Metal Pipe Thickness Based on the Tilt Angle Intersection

Giant Magnetoresistance Sensors: A Review on Structures and Non-Destructive Eddy Current Testing Applications

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