Abstract
Previously we have succeeded in developing the ECT sensor called “Flat ∞ coil”. This sensor is improved of the ∞ coil which is developed by our laboratory in 2013. Flat ∞ coil sensor is composed of the two spiral type exciting coil and one sensing coil. This sensor is so high sensitive and has the versatile capability e.g. it is able to detect the not only flat surface defect but also curved surface defect compared with conventional ∞ coil.
This paper concerns with an optimization of the flat ∞ coil. Optimization of this flat ∞ coil fully depends on the 3D finite elements methods. According to the 3D finite element simulation results, we have successfully carried out the optimum size of two exciting coils and a sensing coil.
