USING SIGNALS OF SPECIAL FORM IN MULTI-FREQUENCY EDDY CURRENT TESTING
A. V. Egorov1, V. V. Polyakov1,2, A. A. Lependin1, Ya. I. Gracheva1
1Altai State University, pr. Lenina 61, Barnaul, 656049
2Institute of Strength Physics and Materials Science, pr. Akademicheskii 2/4, Tomsk, 634055
Keywords: автоматизация измерений, метод вихревых токов, диагностика материалов, цифровая обработка сигналов, automation of measurements, eddy current method, diagnostics of materials, digital signal processing
Subsection: ANALYSIS AND SYNTHESIS OF SIGNALS AND IMAGES
Abstract
An eddy current testing method based on the use of an exciting signal of special shape is proposed. Subsequent digital processing the detected output signal enables calculation of the measuring sensor parameters at different frequencies and construction of an experimental hodograph of the sensor-test object system. Experiments performed for materials with different physical and geometrical characteristics of hodograph construction have shown that the proposed method provides a reliable separation of the main factors affecting the results of multi-frequency eddy current measurement. The results can be used in automated systems for diagnostics and non-destructive testing of materials and products.
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