Revealing surface microcracks in metal articles by excitation of high-frequency eddy currents with subsequent infrared-camera imaging

Abstract

A method has been developed for revealing microcracks in metal articles by excitation of high-frequency eddy currents with subsequent recording of the temperature relief with an infrared camera. The sensitivity, as measured by outside crack opening, is 8 μm; this corresponds to Level B of magnetic-powder testing. The method is technologically easier to implement than magnetic-powder one and can therefore replace the latter in many problems of testing.