Eddy-current transducer based on flat spiral coils Soviet journal of nondestructive testing, Vol. 24, No. 4, pp. 235–238 (Dec. 1988)

1990 ◽  
Vol 23 (6) ◽  
pp. 363
Author(s):  
V Franyuk
Keyword(s):  
Nondestructive Testing ◽  
Eddy Current ◽  
Current Transducer ◽  
Spiral Coils ◽  
Flat Spiral ◽  
Eddy Current Transducer

Eddy-current transducer based on flat spiral coils

1990 ◽  
Vol 23 (6) ◽  
pp. 363
Author(s):  
V.A. Franyuk ◽  
L.F. Ivan'kovich
Keyword(s):  
Eddy Current ◽  
Current Transducer ◽  
Spiral Coils ◽  
Flat Spiral ◽  
Eddy Current Transducer

scholarly journals Optimization of the eddy current transducer using COMSOL Multiphysics® and MATLAB® software

2018 ◽  
Vol 19 ◽  
pp. 01004 ◽  
Author(s):  
Konrad Dudziak ◽  
Krzysztof Stawicki ◽  
Andrzej Brykalski
Keyword(s):  
Nondestructive Testing ◽  
Eddy Current ◽  
Comsol Multiphysics ◽  
Excitation Coil ◽  
Current Transducer ◽  
Eddy Current Transducer

The article presents a method of optimizing the eddy current transducer. The transducer is made of three toroidal air cored coils: one excitation coil and two receiver coils. The transducer is used for eddy current nondestructive testing (NDT).

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%.

scholarly journals Experimental Studies of an Eddy Current Transducer with Spatially Periodic Fields

2018 ◽  
pp. 45-50
Author(s):  
B. Gorkunov ◽  
S. Lvov ◽  
Tamer Shaiban ◽  
Y. Borysenko
Keyword(s):  
Eddy Current ◽  
Experimental Studies ◽  
Fixed Frequency ◽  
Current Transducer ◽  
Current Conductor ◽  
Translation Symmetry ◽  
Spatially Periodic ◽  
Transducer Output ◽  
Angular Coordinates ◽  
Eddy Current Transducer

The purpose of this study is to perform a comparative analysis of the experimentally obtained and calculated values of the measuring windings total EMF amplitudes of the eddy current transducer with spatially periodic fields when magnetic and nonmagnetic cylindrical product are placed in it. To realize this goal in the work, a transducer with translational symmetry of excitation magnetic field has been developed. Translation symmetry typical example is the field of a long current conductor. The paper considers quasi-static electromagnetic field with the wavelength that exceeds characteristic transverse dimensions of conductor and cylinder. As the study result it is seen a satisfactory coincidence of the calculated and experimentally obtained values of the EMF of the transducer output signal in the cases of the product absence and with variety of products. As for example for measuring windings with angular coordinates φ = 30° and 60° an error of voltage values difference is less than 10%. The study shows that the advantage of such transducers while operating on one fixed frequency is capability to perform the multi-parameter testing on account of processing of certain amount of some spatial harmonics of excitation field.

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