Exploratory Development on Advanced Eddy Current Coil Excitation and Signal Processing

摘要

The purpose of this program was to achieve improvements in eddy current performance by analytical and experimental exploratory development of the pulse mode of coil excitation as a means of evaluating surface and near-surface defects in low-conductivity materials used in gas turbine engine components. The program successfully demonstrated that the pulsed eddy current approach is capable of detecting flaws as small as 0.010 inch by 0.005 inch in a Ti-6-4 surface. In addition results indicate that this approach offers a promising way to estimate the depth of surface-breaking flaws.