An image synthesis method for eddy current testing based on extraction of defect orientation

Summary form only given. Eddy-current testing (ECT) using meander/mesh coil is shown to be useful, but one cannot detect the defect along the scanning direction of the probe by this method. Therefore, measurements both in horizontal and vertical directions are required, which enforces the analysis of two images for one sample. This paper gives a method for the synthesis of those two images into one image without loss of information on defects, based on the extraction technique of signals with specific orientations. Moreover, one can not only select defects within an angular range, but also compensate the angle-dependent characteristics of the measurement system.