ABSTRACT
This chapter describes a novel electromagnetic concentrative probe is designed through simulations by finite element method, which consists of a special-shaped iron core, excitation coils and a magnetic sensor. It focuses on the air core probes novel strong eddy current by the research, needs probe was designed by or lots of winding turns. The probe is one of the crucial components for the eddy current testing system, determining the detection of useful signals and the measurement sensitivity. The Hall-effect magnetic sensor was used to detect the magnetic flux density in order to obtain the high detection sensitivity in space. The excitation frequency of 5 Hz and duty ratio of 5% are conducive to deep defect detection in the experiments. The experimental results also the probe size and to improve the detection senshowed the effects of the pulse parameters on the desitivity.
