The 4 reference contexts in paper S. Dmitriev F., A. Ishkov V., A. Katasonov O., V. Malikov N., A. Sagalakov M., С. Дмитриев Ф., А. Ишков В., А. Катасонов О., В. Маликов Н., А. Сагалаков М. (2017) “ИССЛЕДОВАНИЕ ПРОВОДЯЩИХ МАТЕРИАЛОВ С ПОМОЩЬЮ МНОГОЧАСТОТНОЙ ИЗМЕРИТЕЛЬНОЙ СИСТЕМЫ НА ОСНОВЕ СВЕРХМИНИАТЮРНЫХ ВИХРЕТОКОВЫХ ПРЕОБРАЗОВАТЕЛЕЙ // STUDY OF CONDUCTIVE MATERIALS BY MEANS OF A MULTI-FREQUENCY MEASUREMENT SYSTEM BASED ON MICROMINIATURE EDDY CURRENT TRANSFORMERS” / spz:neicon:sustain:y:2017:i:4:p:49-52

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    5377
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    Research in this area is in constant development. The analysis of current research shows a trend to size reduction (miniaturization) of eddy current transformers (ECT) used in quality control of alloys
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    [1-6]
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    . One of the methods allows developing 5*5 mm transformers with the wire diameter of 0.15 mm. However, such transformers do not enable the required depth of magnetic field penetration and localization for local measurement in heterogeneous conductive media.
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    6957
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    That decreases the measurement accuracy of the controlled parameter due to the fact that the transformer’s input signal significantly depends on the interaction between the two cores that can unpredictably affect the enhancement of the eddy current field that carries the information on the tested objects
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    . Manufacturing such instruments requires the deployment of special production lines, which causes a significant growth of the price of the final product. In order to reduce the instrument’s price it has been suggested to substitute the expensive hardware units with PC software.
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    7757
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    The advantage of this transformer (that the comparable devices do not have) is the capability to perform local measurements within areas of about hundreds of мms and about 5 mm deep. The measurement parameter is the conductivity of the material and its distribution over the surface and depth of the tested object
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    [8]
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    . The excitation winding with the diameter D1 = 0.12ч0.13 mm of the microminiature transformer consists of 10 loops of copper wire with the cross-section area of 5 мm2. The measurement winding with the diameter of 0.05ч0.08 mm consists of 130 loops of copper wire with the cross-section area of 20 мm2.
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    11980
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    Owing to simultaneous control of the frequency of the generated signal at the excitation winding and cut-off frequency of the filtration system, as well as selective amplification the useful signal is extracted. The latter carries information on the distribution of conductivity within the object, including its defects
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    . Software control allows changing the operation frequency of the measurement system in such a way as to enable reliable recording of the signal received from the measurement winding. Experimental results In order to evaluate the maximum depth of situation and linear dimensions of defects that justify the use of eddy current test method, samples with model defects were prepared.
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