A method of eddy-current flaw detection of bars and tubes based on the use of a combined eddy-current transducer with excitation of spatial magnetic-field components at different frequencies

2011 ◽  
Vol 47 (11) ◽  
pp. 747-753 ◽  
Author(s):  
A. E. Goldshtein ◽  
V. F. Bulgakov ◽  
H. -M. V. A. Kroning
Keyword(s):  
Magnetic Field ◽  
Eddy Current ◽  
Flaw Detection ◽  
Current Transducer ◽  
Eddy Current Transducer

Application of an Ultra-Compact Eddy-Current Transducer for Investigation of Defects in Welded Joints of High-Strength Steel

2021 ◽  
Vol 1037 ◽  
pp. 400-408
Author(s):  
Vladimir N. Malikov ◽  
Alexey Ishkov ◽  
Leonid Nikonov
Keyword(s):  
Eddy Current ◽  
Welded Joints ◽  
Eddy Currents ◽  
Flaw Detection ◽  
High Strength Steels ◽  
High Strength ◽  
Low Carbon ◽  
Ferrite Core ◽  
Current Transducer ◽  
Eddy Current Transducer

This article discusses the results of work on the creation of a flaw detection unit, which is focused on the study of high-strength steels. Welded joints of transformer tanks, which are made of steel grade 08G2B, were selected as the object of research. We chose this grade because of the ultra-low carbon content of this material. This opens up opportunities for the application of eddy current nondestructive testing methods. For practical measurements, a scanning device was designed and optimized. It includes a converter that uses the principles of eddy currents and includes three coils assembled on a ferrite core, grade 80NMZ. The device was tested on samples with model continuity defects (cracks and holes). Also, within the framework of the publication, modeling of corrosion defects in welded joints was carried out.

Noninvasive Electromagnetic Evaluation of Bjo¨rk-Shiley Heart Valves: Lifetime Prediction

2008 ◽  
Author(s):  
Raimond Grimberg ◽  
Adriana Savin ◽  
Shiu C. Chan ◽  
Rozina Steigmann ◽  
Lalita Udpa ◽  
...  
Keyword(s):  
Eddy Current ◽  
Heart Valves ◽  
Probability Of Detection ◽  
New Method ◽  
Lifetime Prediction ◽  
Prosthetic Heart Valves ◽  
In Vitro Experiments ◽  
Current Transducer ◽  
Eddy Current Transducer

Prosthetic heart valves of the Bjork-Shiley Convexo-Concave (BSCC) type have long been used extensively in implants; however, there have been reports of cases where one component of the valves failed, leading to the demise of the patient. This paper presents a new method for noninvasive electromagnetic evaluation for this type of valve, using an eddy current transducer with orthogonal coils. In vitro experiments have shown that discontinuities of outlet strut with depths equal or larger than 0.4mm can be detected with a probability of detection (POD) of 86.4%, and in the case of discontinuities with depth equal or larger than 0.6mm with POD of 97%.

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