Automated Computer-Measuring Complex for Multi- Frequency Eddy Current Diagnostics of Metallic Materials
Abstract
An automation of eddy current measurements can increase accuracy and reliability of eddy current diagnostics. The automation by using virtual instruments provides greater adaptability of eddy current measurements to changing conditions and control modes, and increases the speed and performance of control operations. In this paper, we present a computer-measuring complex for multi-frequency eddy current diagnostics that includes virtual instruments developed in LabView's graphical programming environment. Recorded digital signals are processed, and hodographs of the "controlled object – eddy current sensor" in a given frequency range are calculated with the help of these virtual devices. Experimental hodographs are produced for copper plate testing samples of various thicknesses with applied dielectric layer. The influence of material and dielectric layer thicknesses on the shape and arrangement of hodograph lines is described and analyzed. Distinguishability of various competing factors affecting the results of eddy current diagnostics is investigated.
DOI 10.14258/izvasu(2017)4-03
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Copyright (c) 2017 Я.И. Грачева, А.В. Егоров, В.В. Поляков, А.А. Дмитриев
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