Low cost embedded hardware based multi-frequency Eddy Current Testing System

Measurement and Control

Faraj

Samsuri

et al. 2018

124

Eddy current testing plays an important role in numerous industries, particularly in material coating, nuclear and oil and gas. However, the eddy current testing technique still needs to focus on the details of probe structure and its application. This paper presents an overview of eddy current testing technique and the probe structure design factors that affect the accuracy of crack detection. The first part focuses on the development of different types of eddy current testing probes and their advantages and disadvantages. A review of previous studies that examined testing samples, eddy current testing probe structures and a review of factors contributing to eddy current signals is also presented. The second part mainly comprised an in-depth discussion of the lift-off effect with particular consideration of ensuring that defects are correctly measured, and the eddy current testing probes are optimized. Finally, a comprehensive review of previous studies on the application of intelligent eddy current testing crack detection in non destructive eddy current testing is presented.

Section: Factors Contributing To Eddy Current Signalsmentioning

confidence: 99%

Challenges in improving the performance of eddy current testing: Review

Measurement and Control

Faraj

Samsuri

et al. 2018

124

“…These features were used to characterise the different types of defects in CFR plastics using scanning PEC and the feature representing the magnetic field intensity variation [22,85]. Experimental appliances mainly consist of inquiries of rectangular hall sensor, generator module for pulse signal, module Howland pump circuit and signal [75]…”

Section: Pulsed Excitation Signalmentioning

confidence: 99%

“…In this case, changes in coil impedance are used in detecting the presence of conductive materials. ECS has been designed and developed based on multiple frequencies to measure cracks in metal structures [74, 75]. This includes the peak AC source and remains capable in operating within the frequency range for the metal surface and sub‐surface near the crack metal.…”

Section: Magnetic Characterisation Excitation Sourcementioning

confidence: 99%

See 1 more Smart Citation

Review on system development in eddy current testing and technique for defect classification and characterization

Ali

IET Circuits, Devices & Systems

Rifai

et al. 2017

Eddy current testing (ECT) is one of the non-destructive evaluation techniques widely used, especially in oil and gas industries. It characterized noisy data to the less-than-perfect detection and as an indication of serious false alarm problem. However, not many researchers have described in detail the intelligent ECT crack detection system. This paper introduces a review of ECT technique and factors that affect the signal fundamental according to the hardware and software development. First, describe the magnetic excitation resources including the sinusoidal and pulse exciting signal. Second, outlines explanation about the ECT probe. The explanations are more about the probes development for air core probe and giant magnetoresistance probe. Third, there is discussion on ECT circuit that used including ECT system, ECT rotating magnetic field and application measurement for optimal control parameters. The defect in characterizations and measurement are discussed on the fourth part of this paper. The fourth part discusses the ECT lift-off compensation including the lift-off and application of intelligent technique in ECT. The limitations of lift-off for coil probe and compensation techniques also discussed in this part. Finally, a comprehensive review of previous studies on the application of intelligent ECT crack detection in nondestructive ECT is presented.

“…The application of eddy current is widespread for measuring electrical conductivity, for defect identification on metallic material and for assessing coating thickness on pipes. Various parameters were considered for the testing methods, which include the type of signal, the amplitude of the signal and the phase angle of the probe, where each of these parameters will affect the signal whenever there is a crack in the plate or workpiece surface [ 1 , 2 , 3 ]. ECT is also used as a quality control tool in various industries to detect a defect and inspect the condition of samples [ 4 , 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

A Novel Eddy Current Testing Error Compensation Technique Based on Mamdani-Type Fuzzy Coupled Differential and Absolute Probes

Ali

Paw

et al. 2018

Sensors

Eddy current testing (ECT) is an accurate, widely used and well-understood inspection technique, particularly in the aircraft and nuclear industries. The coating thickness or lift-off will influence the measurement of defect depth on pipes or plates. It will be an uncertain decision condition whether the defects on a workpiece are cracks or scratches. This problem can lead to the occurrence of pipe leakages, besides causing the degradation of a company’s productivity and most importantly risking the safety of workers. In this paper, a novel eddy current testing error compensation technique based on Mamdani-type fuzzy coupled differential and absolute probes was proposed. The general descriptions of the proposed ECT technique include details of the system design, intelligent fuzzy logic design and Simulink block development design. The detailed description of the proposed probe selection, design and instrumentation of the error compensation of eddy current testing (ECECT) along with the absolute probe and differential probe relevant to the present research work are presented. The ECECT simulation and hardware design are proposed, using the fuzzy logic technique for the development of the new methodology. The depths of the defect coefficients of the probe’s lift-off caused by the coating thickness were measured by using a designed setup. In this result, the ECECT gives an optimum correction for the lift-off, in which the reduction of error is only within 0.1% of its all-out value. Finally, the ECECT is used to measure lift-off in a range of approximately 1 mm to 5 mm, and the performance of the proposed method in non-linear cracks is assessed.