Flaws characterization with pulsed eddy currents NDT
نویسندگان
چکیده
منابع مشابه
Compu1er Modeling of Pulsed Eddy-currents in Conducting Materials for Ndt Purposes
The numerical modeling of single frequency eddy-current phenomena based on the magnetic vector potential has been successfully applied to many NDT applications [1-3]. Despite the considerable wealth of sinusoidal eddy-current literature, the numerical modeling of pulsed eddy-currents has received little attention. Most of the recent finite element transient eddy-current NDT modeling [4,5] emplo...
متن کاملTowards Material Characterization and Thickness Measurements using Pulsed Eddy Currents implemented with an Improved Giant Magneto Resistance Magnetometer
Standard Pulsed Eddy Current Systems, as RTD-INCOTEST© equipment, use receiver coils to measure eddy current decay in conducting objects. Advantages of full coils, as sensor for the eddy current, are its simple construction and the possibility of eddy current focussing. But, some disadvantages are the high induction voltage due to a large pulsed signal, the large sensor area and the low coil’s ...
متن کاملStandard Flaws for Eddy Current Probe
Calibration procedures for eddy current inspections often involve the use of artifact standards containing manufactured flaws. The manufactured flaw is assumed to be a good approximation of the type of flaw being sought during the inspection. These manufactured flaws are most often produced by electrical dis charge machining (EDM) , milling, or the controlled growth of fatigue cracks. With simp...
متن کاملDetection of Hidden Flaws with GMR-Based Eddy Current Technique
Nondestructive inspections involving multi-layered structures often require a reliable NDI methodology to estimate size and location of a flaw with quantitative information about width and depth. Compared to conventional wire-wound pick-up coil based eddy current NDI methods, Giant Magneto-resistive (GMR) sensor based eddy current methods have shown a much better sensitivity (20–50 times) for a...
متن کاملCharacterization of Magnetron Sputtered Coatings by Pulsed Eddy Current Techniques
A method that uses induced pulsed eddy currents for characterization of thick magnetron sputtered Nb coatings on steel is presented in this paper. The objectives of this work are to develop a system for rapid quantitative nondestructive inspection of coatings as well as to determine the correlation between coating properties, such as density and purity, and eddy current measured resistivity of ...
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ژورنال
عنوان ژورنال: IEEE Transactions on Magnetics
سال: 1999
ISSN: 0018-9464
DOI: 10.1109/20.767399